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FT-857 vs 706 MkII ?
Is there anything to choose between these two sets for use on a boat
on both ham and marine bands (after appropriate doctoring) ? I am inclining to the Yaesu, but largely because my main set in the FT-897 and I like it. I am a bit surprised by the advice to add an SSB filter and DSP to the Yaesu, that adds a lot to the price. How do the base sets compare? Thanks |
FT-857 vs 706 MkII ?
Quite need that the frontpanel on the 706mkiig is detachable. Makes it
easier to install at your nav station. Bjarke "Steve" wrote in message oups.com... Is there anything to choose between these two sets for use on a boat on both ham and marine bands (after appropriate doctoring) ? I am inclining to the Yaesu, but largely because my main set in the FT-897 and I like it. I am a bit surprised by the advice to add an SSB filter and DSP to the Yaesu, that adds a lot to the price. How do the base sets compare? Thanks |
FT-857 vs 706 MkII ?
On 17 Feb, 20:45, "Bjarke M. Christensen"
bjarkeNG@grevestrand_punktum_danmark wrote: Quite need that the frontpanel on the 706mkiig is detachable. Makes it easier to install at your nav station. Bjarke So is the faceplate on the FT-857. And the link does not require an exotic and expensive cable. |
FT-857 vs 706 MkII ?
"Steve" wrote in
oups.com: and marine bands (after appropriate doctoring) If they catch you using ham gear on the marine bands, they'll take your ham license and ship license and fine you bigtime. It is something to consider. Unless your 706 or Yahoo has the high stability master oscillator, it isn't stable enough for marine band use, which is why it's not approved. I prefer Yahoo over Icom on the ham bands. But, the Icom M802 is a great radio for both bands. To put the M802 to full-band transmit, all freqs, turn it off. Hold down MODE + TX + 2 while turning it on. It now transmits from 2-30 Mhz. To put it back to just marine use, simply repeat the procedure. Be careful not to press any other buttons doing this as many other combinations exist that are undocumented to the users, that may lock it for an expensive factory reset. I use Lionheart's M802 to an AT-130 loading a 55' backstay and triattic capacitor hat. Works great on all the bands, considering most of the power it generates is simply absorbed by the sailing rigging. Now, which marine rig converted to the ham bands were you buying? My ham stations are a fully loaded FT-990AC to a Drake L4B with proper stable HVDC power supply to a Butternut HF9VX vertical mounted in the center of a metal roof ground plane. Mobile is a fully loaded FT-900 and highly modified Tentec Hercules II 12V linear feeding a 15' tall homebrew Texas Bug catcher of my own design at 650W RF output from a '73 Mercedes 220 Diesel with no electronic noise makers, whatsoever, on 160-10M. I hardly ever use it any more. Skype on the internet is more fun without those old codgers bitching at you you're on their private frequency they've been using since 1948....(c; Larry W4Charleston South Carolina on Lionheart WDB-6254 an old codger ham since 1957...I was 11. -- Vista has been out a week. Is Service Pack 1 ready yet? |
FT-857 vs 706 MkII ?
On 18 Feb, 06:11, Larry wrote:
"Steve" wrote groups.com: and marine bands (after appropriate doctoring) If they catch you using ham gear on the marine bands, they'll take your ham license and ship license and fine you bigtime. It is something to consider. Unless your 706 or Yahoo has the high stability master oscillator, it isn't stable enough for marine band use, which is why it's not approved. Thanks for this. I should have mde it clear. It will be used for ham, including pactor, and for receiving weather. However it will be modfied to give access to marine HF. In case of emergency I want all options available. But it will not be routinely used on marie bands. The M802 is too big, too heavy and too expensive for my purposes. |
FT-857 vs 706 MkII ?
Are you saying that the osc's in marine ht/ssb's are more stable that the
osc's in ham hf/ssb's ? Why should that be so ? If icom can make it stable in the marine ssb; why don't they deploy the same technology in the ham ssb's ? I guess freq stability is a must for hams as well ?? When the 802 is enabled for ham (using the procedure you describe) will it do both or do you have to toggle it back constantly ? You often hear that marine ssb's are difficult to use on ham, as they are optimised for a fixed freq setting, and not for the more variable freq used on ham. How big a problem i that ? Idont know you ham license structure, but where I live only the higest license level are allowed to use more than 100w. Can the 802 be configured to run only 100w on ham bands and 150w on marine bands ? Bjarke "Larry" wrote in message ... "Steve" wrote in oups.com: and marine bands (after appropriate doctoring) If they catch you using ham gear on the marine bands, they'll take your ham license and ship license and fine you bigtime. It is something to consider. Unless your 706 or Yahoo has the high stability master oscillator, it isn't stable enough for marine band use, which is why it's not approved. I prefer Yahoo over Icom on the ham bands. But, the Icom M802 is a great radio for both bands. To put the M802 to full-band transmit, all freqs, turn it off. Hold down MODE + TX + 2 while turning it on. It now transmits from 2-30 Mhz. To put it back to just marine use, simply repeat the procedure. Be careful not to press any other buttons doing this as many other combinations exist that are undocumented to the users, that may lock it for an expensive factory reset. I use Lionheart's M802 to an AT-130 loading a 55' backstay and triattic capacitor hat. Works great on all the bands, considering most of the power it generates is simply absorbed by the sailing rigging. Now, which marine rig converted to the ham bands were you buying? My ham stations are a fully loaded FT-990AC to a Drake L4B with proper stable HVDC power supply to a Butternut HF9VX vertical mounted in the center of a metal roof ground plane. Mobile is a fully loaded FT-900 and highly modified Tentec Hercules II 12V linear feeding a 15' tall homebrew Texas Bug catcher of my own design at 650W RF output from a '73 Mercedes 220 Diesel with no electronic noise makers, whatsoever, on 160-10M. I hardly ever use it any more. Skype on the internet is more fun without those old codgers bitching at you you're on their private frequency they've been using since 1948....(c; Larry W4Charleston South Carolina on Lionheart WDB-6254 an old codger ham since 1957...I was 11. -- Vista has been out a week. Is Service Pack 1 ready yet? |
FT-857 vs 706 MkII ?
But if 'emergency' is a concern to you, you should have the distress
function that is only availbale on marine ssb's. I don't get you point with the weight. Don't you carry some 200 liter of fresh water ? price I agree. It's clear that there is to litlle competition on marine rig's and consequently the prices are 20-30% higher for the "same" rig. Bjarke "Steve" wrote in message oups.com... On 18 Feb, 06:11, Larry wrote: "Steve" wrote groups.com: and marine bands (after appropriate doctoring) If they catch you using ham gear on the marine bands, they'll take your ham license and ship license and fine you bigtime. It is something to consider. Unless your 706 or Yahoo has the high stability master oscillator, it isn't stable enough for marine band use, which is why it's not approved. Thanks for this. I should have mde it clear. It will be used for ham, including pactor, and for receiving weather. However it will be modfied to give access to marine HF. In case of emergency I want all options available. But it will not be routinely used on marie bands. The M802 is too big, too heavy and too expensive for my purposes. |
FT-857 vs 706 MkII ?
"Bjarke M. Christensen" bjarkeNG@grevestrand_punktum_danmark wrote in
: But if 'emergency' is a concern to you, you should have the distress function that is only availbale on marine ssb's. Useless. The half-assed DSC/GMDSS implementation on pleasure craft marine HF is damned near useless. If he's going to spend money on EMERGENCY radios, he needs a 406 Mhz EPIRB with its OWN GPS receiver built inside it, not some bogus GPS-ready he hooks his GPS to. You don't even have to press the button, just let it float and off she goes. They ALL pay attention to the 406 EPIRB going off. Hell, CG doesn't pay attention to boys screaming for help after their stupid father/uncle rammed his sailboat into the Charleston Jetties. There's no doubt they are in trouble. I've listened to the tape the local radio station FORCED them to release under Freedom of Information Act. How any CG watchstander could have just let them all drown for fear of getting the boat crew out of their racks has never left my mind. How soon the rest of the world forgets the "Morning Dew" incident. The cure for this is 406 EPIRB notifying the big guns who are NOT afraid of waking up the CG to do something and have the horsepower to do it. HF is DOOMED. All the commercial stations that DID do most of the listening, except for the Alaskans I'm going to get lambasted by for saying it, are gone! Try it for yourselves! Switch to one of the CG frequencies and CALL 'EM. I did. On the 5th frequency, I FINALLY got ONE CG radio operator who was awake. I pointedly asked him why noone but him was monitoring those other 4 frequencies. He didn't know. I'm well versed in time-of-day HF propagation, the physics of HF. I've been a ham using it since 1957. Right now, the bands are in awful shape, the sunspot cycle near its low. 150 watts into all that rigging doesn't make the trip very well in these conditions. You're much better off with an Iridium phone so you can call 'em on the landline! Larry W4CSC and other fine old calls since 1957. -- Vista has been out a week. Is Service Pack 1 ready yet? |
FT-857 vs 706 MkII ?
"Bjarke M. Christensen" bjarkeNG@grevestrand_punktum_danmark wrote in
: Are you saying that the osc's in marine ht/ssb's are more stable that the osc's in ham hf/ssb's ? Why should that be so ? If icom can make it stable in the marine ssb; why don't they deploy the same technology in the ham ssb's ? I guess freq stability is a must for hams as well ?? Yes, of course. Ham radio has only one channelized band, 60 meters a new one, shared with government stations under a test for emergency comms in places like Katrina. All the other ham bands are broad strokes of frequencies you can operate anyplace in there you like. The radios have 10 or 100 Hz steps. Their master oscillators are cheaply made, not temperature compensated much as there is no need. Most have a trimmer on the outside of the radio so you can tweak it closer, yourself. Marine radios have temperature-compensated crystal master oscillators accurate to a standard. The M802 is: Operating temp. range : –30°C to +60°C; –22°F to +140°F Guaranteed range : –20°C to +55°C; –4°F to +131°F Frequency stability : ±10Hz (at –20°C to +55°C) This exceeds the .005% of the FCC standard for type acceptance. Hell, 10 Hz is closer than the 20 Hz of an AM broadcast transmitter costing thousands of times more. (Most AM transmitters, today, are within 1 Hz. You rarely hear much of a beat note at night on frequencies you can hear two or more stations transmitting on.) M802 also exceeds other standards for unwanted emissions that cause interference to other frequencies: Output power : 150, 60, 20W PEP (Selectable) Spurious emissions : –62dB Unwanted sideband : 55dB Carrier suppression : 40dB Its design also keeps you on the right sideband, USB, and its computer will not permit you to do technical things wrong users know nothing about that any ham radio will easily do if you just bump a knob or press the wrong button. All this is designed so that operators with very limited or no knowledge of radio transmitter operation can operate the marine HF radio without causing undue interference to other services and users by technical incompetence. It's why cop, business band, trunk radio and CB radios are so simple...a minimal number of knobs to screw up. UNfortunately, M802 has way too many buttons and knobs for most of its owners to use. It requires too much education the older SSB radios didn't need....Channel, Volume, Squelch, PTT microphone are all they should have. Japanese pride themselves in making anything they create into a technological wonder. M802 should make them all very proud. The other reason they don't make ham radios so stringent is simple....money. You can see it in the difference in price between an M802 type-accepted commercial radio and the Icom 706 ham rig. Few hams will pay for a type-accepted commercial-grade radio. Hams are an awful "cheap" lot. So, in response to the market...just like consumer electronics everywhere...Kenmore, Yahoo and Icum make 'em as cheaply as the market wants...just like that PoS TV in your living room. When the 802 is enabled for ham (using the procedure you describe) will it do both or do you have to toggle it back constantly ? It will do both. But, make SURE you put it back to channelized transmit before any Ship Inspections or you'll be busted. Pleasure boats are pretty much immune from ship inspections, but, if you look at your ship station licence from FCC, you'll notice they can come inspect your installation at any time for compliance. If I'm aboard, it's open so I can chat on 20 meters. If I'm not aboard, being the only licensed ham, I switch it back so my captain doesn't try to talk to BBC on 31 meters by mistake....one of his channels...(c; You often hear that marine ssb's are difficult to use on ham, as they are optimised for a fixed freq setting, and not for the more variable freq used on ham. How big a problem i that ? That is true of a lot of them. They are made to be channelized radios. When Icom made the M802, some ham infiltrated the design team and had them implement BOTH channelized operation, where the display shows you what marine channel you are operating on...and...a beautiful frequency display where the left knob chooses which digit to change with the right knob, giving you coarse and fine frequency control, AND, made it so the digit you're changing carries over when it switches anything from 9 to 0. The right knob acts just like a ham VFO, in 100 Hz steps which is close enough for hams. There's a little learning curve to switch the dials between modes but once you learn how and use it it becomes second nature very quickly. It's not a big problem at all on M802. The older and cheaper radios don't have this feature making them useless...which is what caused boaters to illegally use ham radios for marine radios in the first place....that and PRICE. Idont know you ham license structure, but where I live only the higest license level are allowed to use more than 100w. Can the 802 be configured to run only 100w on ham bands and 150w on marine bands ? Yes. The M802 has 3 power levels simply adjusted by the front panel buttons. From the webpage: http://www.icomamerica.com/products/...m802/specs.asp Output power : 150, 60, 20W PEP (Selectable) Another issue for your country is that I'm talking about USA type acceptance and the FCC, Federal Communications Commission. Although our government bureaucrats like to think they are omnipotent, they are not. Your laws and radio regulations ARE different than our, but probably accept FCC type acceptance as a matter of convenience. You may have more lax laws than the USA. Check with your radio bureaucrats for guidance on Marine installations. America has changed, recently. In the past, you had to have a 2nd Class FCC commercial radio operator's license to install and configure a marine radio. Owners were not allowed to do anything to it but use it. Now, owners are allowed to install it as long as the installation does not involve any adjustments to the factory-set, type accepted internal settings. The computer and transistor broadband amplifiers allowed this to happen as no radios require extensive tuning like they used to back in the tube days. They're all plug n play. I'm sure Danmark's radio bureaucrats have webpages about the laws, regulations and requirements for your country. Larry. |
FT-857 vs 706 MkII ?
"Larry" wrote in message ... Marine radios have temperature-compensated crystal master oscillators accurate to a standard. Marine SSB's use an oven controlled crystal oscillator, not temperature-compensated ones. Ham rigs that have a high stability oscillator use the termperature-compenstated crystal oscillators. When the 802 is enabled for ham (using the procedure you describe) will it do both or do you have to toggle it back constantly ? It will do both. But, make SURE you put it back to channelized transmit before any Ship Inspections or you'll be busted. There is no need to do this. It is perfectly legal to put the 802 in open mode and use it on the ham bands. You do not void the warranty, the type certification, or break any FCC rules by doing this. You often hear that marine ssb's are difficult to use on ham, as they are optimised for a fixed freq setting, and not for the more variable freq used on ham. How big a problem i that ? It's not a big problem at all on M802. The older and cheaper radios don't have this feature making them useless...which is what caused boaters to illegally use ham radios for marine radios in the first place....that and PRICE. You can also easily open up the M710 and M700pro SSB's to operate on the ham bands and use the channel knob as a VFO control. As with the 802, you can only change frequency in 100hz steps or greater and it operates as a detented switch as opposed to the smooth rotary encoder of a ham rig. Eric |
FT-857 vs 706 MkII ?
Well, I got a rig for my boat last winter and settled with the Yaesu 857D.
It seemed to consume less power in listening mode and also coverd 70 cm. Unfortunately, The Linux HamLib looks a bit aplha... Steve wrote: Is there anything to choose between these two sets for use on a boat on both ham and marine bands (after appropriate doctoring) ? I am inclining to the Yaesu, but largely because my main set in the FT-897 and I like it. I am a bit surprised by the advice to add an SSB filter and DSP to the Yaesu, that adds a lot to the price. How do the base sets compare? Thanks |
FT-857 vs 706 MkII ?
OK, that must be country specific. Distress calls in my part og the world
are being taken very seriously. So seriously that if someone press the button without reason that are to pay a 1000-5000 USD fee for sending out a helicopter and a few lifeboats to see. Further, if you do send out digital distress, it will wake up all the other gmdss radios making then awful noisy. CG or not. Many people (among other commercial ships) will notice that.... I could be just because I'm from an old sailor nation, but I think you should do something to fix your CG problem. However I do agree than an epirb is the most valuable security device. Worldwide .... Bjarke "Larry" wrote in message ... "Bjarke M. Christensen" bjarkeNG@grevestrand_punktum_danmark wrote in : But if 'emergency' is a concern to you, you should have the distress function that is only availbale on marine ssb's. Useless. The half-assed DSC/GMDSS implementation on pleasure craft marine HF is damned near useless. If he's going to spend money on EMERGENCY radios, he needs a 406 Mhz EPIRB with its OWN GPS receiver built inside it, not some bogus GPS-ready he hooks his GPS to. You don't even have to press the button, just let it float and off she goes. They ALL pay attention to the 406 EPIRB going off. Hell, CG doesn't pay attention to boys screaming for help after their stupid father/uncle rammed his sailboat into the Charleston Jetties. There's no doubt they are in trouble. I've listened to the tape the local radio station FORCED them to release under Freedom of Information Act. How any CG watchstander could have just let them all drown for fear of getting the boat crew out of their racks has never left my mind. How soon the rest of the world forgets the "Morning Dew" incident. The cure for this is 406 EPIRB notifying the big guns who are NOT afraid of waking up the CG to do something and have the horsepower to do it. HF is DOOMED. All the commercial stations that DID do most of the listening, except for the Alaskans I'm going to get lambasted by for saying it, are gone! Try it for yourselves! Switch to one of the CG frequencies and CALL 'EM. I did. On the 5th frequency, I FINALLY got ONE CG radio operator who was awake. I pointedly asked him why noone but him was monitoring those other 4 frequencies. He didn't know. I'm well versed in time-of-day HF propagation, the physics of HF. I've been a ham using it since 1957. Right now, the bands are in awful shape, the sunspot cycle near its low. 150 watts into all that rigging doesn't make the trip very well in these conditions. You're much better off with an Iridium phone so you can call 'em on the landline! Larry W4CSC and other fine old calls since 1957. -- Vista has been out a week. Is Service Pack 1 ready yet? |
FT-857 vs 706 MkII ?
In article ,
"Eric Fairbank" wrote: Marine SSB's use an oven controlled crystal oscillator, not temperature-compensated ones. Ham rigs that have a high stability oscillator use the termperature-compenstated crystal oscillators. May, or may not, be true, depending on the Radio Design. Type Acceptance does NOT define the design, it only specifies the Stability..... Bruce in alaska -- add a 2 before @ |
FT-857 vs 706 MkII ?
In article ,
Larry wrote: All the commercial stations that DID do most of the listening, except for the Alaskans I'm going to get lambasted by for saying it, are gone! Naw, Larry, I would NEVER "lambast" you for such a statment...... Bruce in alaska -- add a 2 before @ |
FT-857 vs 706 MkII ?
"Bjarke M. Christensen" bjarkeNG@grevestrand_punktum_danmark wrote in
: I could be just because I'm from an old sailor nation, but I think you should do something to fix your CG problem. Once the TV people made the story into a series of some pretty scathing reports, the government bureaucrats couldn't just paint over the scratch. Some definate changes were made, but that will go slack as time goes by. The USCG thinks itself a drug enforcement agency, now, not a real service to the marine community taxpayers. They love flack jackets and waving M- 16 automatic rifles around dressed in dark green suits like the SWAT team. The South Carolina state bureaucrats even have dark green SWAT boats to put their cowboys into. However I do agree than an epirb is the most valuable security device. Worldwide .... Just make sure it's not a 121.5 Mhz EPIRB of old. Airliners don't monitor that any more...no ears at sea. Here it's just used as a localizer for the RDF on the helos to pinpoint your lifejacket floating with or without you. The US military satellite constellation is at your service on 406 Mhz with your MMSI. The GPS gets that fix down to 3-6 feet, which makes a real difference in awful weather. Larry -- Vista has been out a week. Is Service Pack 1 ready yet? |
FT-857 vs 706 MkII ?
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FT-857 vs 706 MkII ?
"Larry" wrote in message ... There's no oven in the M802. Yes there IS. It uses a CR-604 OCXO. That's Oven Controlled Crystal Oscillator. It uses a resistive heating element operating directly off the HV supply. Eric |
FT-857 vs 706 MkII ?
In addition to the M802, the following marine SSB's also use an OCXO. Icom
M700, M710, Furuno FS-1503, and the SEA222. Eric |
FT-857 vs 706 MkII ?
"Eric Fairbank" wrote in
: Yes there IS. It uses a CR-604 OCXO. That's Oven Controlled Crystal Oscillator. It uses a resistive heating element operating directly off the HV supply. What "high voltage supply"?? Does yours have tubes in it?? Mine only draws around 200ma on receive, hardly enough to run its computer and any kind of heater... Larry -- Vista has been out a week. Is Service Pack 1 ready yet? |
FT-857 vs 706 MkII ?
"Eric Fairbank" wrote in
: In addition to the M802, the following marine SSB's also use an OCXO. Icom M700, M710, Furuno FS-1503, and the SEA222. Eric Now you've got my curiosity up. I've emailed Icom to find out and try to wheedle an M802 schematic out of them I used to get free with ham equipment. Larry -- Vista has been out a week. Is Service Pack 1 ready yet? |
FT-857 vs 706 MkII ?
Well, thanks for this. I will not be sailing US waters and contactng USCG is not high on my priority list. I had thought that the ability to contact a fellow boater who had only marine SSB may be useful under unusual circumstances. But I see the error of my ways now. Let me re-phrase the question - Is there anything to choose between the FT-857 and the IC-706IIg for use on a boat on ham bands only ? How do such sets stand-up to very hot, humid and salty conditions ? Thanks |
FT-857 vs 706 MkII ?
Well Larry, you've just shown me your ignorance of modern electronic transceivers if you don't know what an OCXO is or what the HV supply is. I won't waste my time trying to educate you on these commonly used terms that we electronics engineers and technicians use these days. Maybe you should take a look at the service manuals for these rigs and get your facts straight before putting out bum information in this newsgroup. Eric "Larry" wrote in message ... "Eric Fairbank" wrote in : Yes there IS. It uses a CR-604 OCXO. That's Oven Controlled Crystal Oscillator. It uses a resistive heating element operating directly off the HV supply. What "high voltage supply"?? Does yours have tubes in it?? Mine only draws around 200ma on receive, hardly enough to run its computer and any kind of heater... Larry -- Vista has been out a week. Is Service Pack 1 ready yet? |
FT-857 vs 706 MkII ?
I'll save you the trouble. I just threw together a web page with three
images from the service manual. I have one as I have done repairs and adjustments to several of these radios. It's my job as a marine electronics tech. The first pic is the block diagram of the PLL circuit, the next one is from the main block diagram that shows the reference oscillator (OCXO) that clearly shows the HV supply feeding the resistive element of the OCXO, and the third one shows the schematic portion with the OCXO in it. Eric "Larry" wrote in message ... Now you've got my curiosity up. I've emailed Icom to find out and try to wheedle an M802 schematic out of them I used to get free with ham equipment. |
FT-857 vs 706 MkII ?
Oops, got a little too fast on the keyboard: http://home.comcast.net/~fairbank56/ocxo.html "Eric Fairbank" wrote in message . .. I'll save you the trouble. I just threw together a web page with three images from the service manual. I have one as I have done repairs and adjustments to several of these radios. It's my job as a marine electronics tech. The first pic is the block diagram of the PLL circuit, the next one is from the main block diagram that shows the reference oscillator (OCXO) that clearly shows the HV supply feeding the resistive element of the OCXO, and the third one shows the schematic portion with the OCXO in it. Eric "Larry" wrote in message ... Now you've got my curiosity up. I've emailed Icom to find out and try to wheedle an M802 schematic out of them I used to get free with ham equipment. |
FT-857 vs 706 MkII ?
In article ,
"Eric Fairbank" wrote: In addition to the M802, the following marine SSB's also use an OCXO. Icom M700, M710, Furuno FS-1503, and the SEA222. Eric since the SEA222 has been out of production in the US for almost a DECADE.... I wonder if you consider it a MODERN Marine Radio???? Bruce in alaska who was around, when the SEA222 was being Type Accepted........ -- add a 2 before @ |
FT-857 vs 706 MkII ?
"Eric Fairbank" wrote in
: Well Larry, you've just shown me your ignorance of modern electronic transceivers if you don't know what an OCXO is or what the HV supply is. I won't waste my time trying to educate you on these commonly used terms that we electronics engineers and technicians use these days. Maybe you should take a look at the service manuals for these rigs and get your facts straight before putting out bum information in this newsgroup. I'm ignorant and stupid. So, is there a news item in there? Larry -- Vista has been out a week. Is Service Pack 1 ready yet? |
FT-857 vs 706 MkII ?
Bruce in Alaska wrote in news:bruceg-
: Bruce in alaska who was around, when the SEA222 was being Type Accepted........ Old fart. Remember those little Raytheons with the pilot light in series with the antenna wire so you could tune the coil taps?.....Yeah, you remember...me, too....(c; Larry -- Vista has been out a week. Is Service Pack 1 ready yet? |
FT-857 vs 706 MkII ?
That wasn't meant to be derogatory. Dictionary 101: Ignorant--lacking knowledge or information as to a particular subject or fact Eric "Larry" wrote in message ... I'm ignorant and stupid. So, is there a news item in there? |
FT-857 vs 706 MkII ?
What's surprising is that Icom is only getting frequency stability on
the order of 1 ppm out of their OCXO which is pretty much what we expect from a modern TCXO! (It's hard to say exactly what Icom is getting since the spec is in Hz, rather than ppm.) Most OCXO's I've encountered are one or two orders of magnitude better than that over the same operating temperature range. It may be that Icom's spec sheet simply shows the FCC required stability, rather than actual, which may be better than required. Not the usual marketing approach if that's what they're doing. Or, their OCXO is "low-tech" and designed only to meet the spec. Chuck ----== Posted via Newsfeeds.Com - Unlimited-Unrestricted-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! 120,000+ Newsgroups ----= East and West-Coast Server Farms - Total Privacy via Encryption =---- |
FT-857 vs 706 MkII ?
In article ,
Larry wrote: Bruce in Alaska wrote in news:bruceg- : Bruce in alaska who was around, when the SEA222 was being Type Accepted........ Old fart. Remember those little Raytheons with the pilot light in series with the antenna wire so you could tune the coil taps?.....Yeah, you remember...me, too....(c; Larry Oh Yea, and I carried a RF Ammeter in my Travel Box, to do ReTunes on ALL the Old AM Marine Radio Systems, scattered all over Alaska, and the Boats floating everywhere in the North Pacific....... How many Marine Radiomen still alive remember using an RF Ammeter.... Old Chief Lynn??? maybe........ Bruce in alaska -- add a 2 before @ |
FT-857 vs 706 MkII ?
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FT-857 vs 706 MkII ?
Just a point : the COSPAS-SARSAT constellation is made possible throught
international cooperation (former USSR, Canada, France and USA). The satellites both GEO's and LEO's are : indian, European, and US weather and communication satellites not military, it's a civilian matter. The Air Forces uses another system call C-SAR. Cheers, Rémy F5LRR e Mon, 19 Feb 2007 00:20:36 +0100, Larry a écrit "Bjarke M. Christensen" bjarkeNG@grevestrand_punktum_danmark wrote in : I could be just because I'm from an old sailor nation, but I think you should do something to fix your CG problem. Once the TV people made the story into a series of some pretty scathing reports, the government bureaucrats couldn't just paint over the scratch. Some definate changes were made, but that will go slack as time goes by. The USCG thinks itself a drug enforcement agency, now, not a real service to the marine community taxpayers. They love flack jackets and waving M- 16 automatic rifles around dressed in dark green suits like the SWAT team. The South Carolina state bureaucrats even have dark green SWAT boats to put their cowboys into. However I do agree than an epirb is the most valuable security device. Worldwide .... Just make sure it's not a 121.5 Mhz EPIRB of old. Airliners don't monitor that any more...no ears at sea. Here it's just used as a localizer for the RDF on the helos to pinpoint your lifejacket floating with or without you. The US military satellite constellation is at your service on 406 Mhz with your MMSI. The GPS gets that fix down to 3-6 feet, which makes a real difference in awful weather. Larry |
FT-857 vs 706 MkII ?
major snip
How many Marine Radiomen still alive remember using an RF Ammeter.... Old Chief Lynn??? maybe........ Oh, yeah! When voltage fed 600 ohm open wire feeders were tuned by drawing a pencil arc to current fed antennas were tuned with a series light bulb! The old BC-375 had an 8 amp thermocouple ammeter with a logarithmic scale that wasn't much use with anything short of a quarter wave whip starting right at the transmitter. Then there was a lower range model that most of us carried, from the ARC 5 antenna relay box. (wasn't it a 3 or 4 amp?) I'll have to go out in the shop (storage room) and look today. Heck, a good, well tuned, re-tubed N-550 could kick up almost 2 amps with a good long whistle! Of course, since the current node of a vertical did most of the radiating, you had to get that current node out of the pilothouse (or radio room) and out into the clear. (where, pray tell, is that on a well rigged fishboat?) Auto tuners are for wimps. Old Chief Lynn |
FT-857 vs 706 MkII ?
"Lynn Coffelt" wrote in
: Of course, since the current node of a vertical did most of the radiating, you had to get that current node out of the pilothouse (or radio room) and out into the clear. (where, pray tell, is that on a well rigged fishboat?) Over on www.qrz.com put my call w4csc into the search box and bring up my webpage. That insulator I'm holding in my hand was the bottom half of an antenna feedthru insulator that fed 70KW on HF from the fish hold on an old Canadian fishing trawler to a T cage vertical mounted between two 90' towers welded to the deck fore and aft. The T feedpoint was right on the deck, offcenter about 20% of the flattop. That little black mark down the side of this 360KV porcelain insulator was what happened when they lit off the Technical Materiel GPT-40K inside the fish hold. It fed the antenna from its 600 ohm open feeder output on top of the cabinet with 3/4" copper tubing sort of in parallel. One of the tubes simply ended 2' under the hatch this insulator was mounted through and the other tube was bolted to the bolt at the little end of this insulator. Here's a picture of the transmitter before Reverend Stair of Overcomer Ministries bought it from VOA Greenville, NC: http://hawkins.pair.com/voanc/voanc07.jpg Rev Stair runs a religious commune out of some trailers in Canadys, SC, and buys lots of radio time on WRNO and other shortwave broadcasters: http://www.overcomerministry.org/ He's a scallywag and parttime sex offender: http://www.christianmediaresearch.com/stair-01.html http://www.clrc.net/brostair.html http://www.freewebs.com/brotherstair/ http://home.bellsouth.net/p/s/commun...geid=21724&ck= Jim Jones is alive and well in many places in South Carolina....(sigh) The idea was they had permission to anchor the ship in international waters off Belize and Belize would allow them to microwave relay programming to the ship from Belize. The FCC used their little tests from the Wando River shipyard as an excuse to confiscate everthing before they could leave the country and try it. I was standing beside the transmitter during the failed test. The insulator was my souvenir...(c; The boat's captain was a ham from St Kitts and had invited me aboard to show off. He wanted out of the project because he was afraid the "brothers" were going to dispose of him at sea as soon as he got the electronics running with his engineer. Glowing blue inside the fish hold just before the flashover to the hatch was most exciting. The whole place glowed blue from the intense RF on 41 meters just above 7.3 Mhz. The flashover didn't harm the massive transmitter, at all. It simply tripped out on load impedance....(c; All in good fun....Every flourescent tube at the boatyard lit up REALLY BRIGHT, even though the little ship was anchored out in the Wando River. It wasn't going to work. The intense RF current from the hull to the sea was eating holes in the steel hull. First indication of that was when the fresh water tanks in the bilge started tasting like SALT and filling themselves. Attempts by Brother Stair's divers to weld up the holes the RF was creating as massive electrolysis were proving unsuccessful. 70KW into a 13 ohm feedpoint impedance creates an impressive current as well as voltage nodes. The insulator is in my trophy case...(c; Larry -- |
FT-857 vs 706 MkII ?
In article ,
"Lynn Coffelt" wrote: Auto tuners are for wimps. Old Chief Lynn it is with very "Fond Memories", that I am happy that I learned about Maritime Mobile Antenna Systems, in the School of Hard Knocks, by tuning the N555 Antenna Tuners, on various hull materials, vessel sizes, RF Ground Systems, and Antenna Designs. Just how many ways, is it possible to tune an N555 to be a almost Perfect Dummy Load, at some Marine Frequncy between 1.6 and 22 Mhz? I am not sure, but I must have found most of them, in 35 years of practice. Real Marine Radiomen always used Manual Tuners..... Bruce in alaska -- add a 2 before @ |
FT-857 vs 706 MkII ?
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FT-857 vs 706 MkII ?
Real Marine Radiomen always used Manual Tuners.....
Bruce in alaska -- I love it! Thanks, Bruce...(c; The most radiation was from the light bulb....hee hee. Larry Don't knock the light bulb Larry! Late 50's sunspot cycle, I worked W7LAN in Washington State from Tucson, Arizona running 60 watt homebrew SSB/6146 rig into dimly flickering 50 watt light bulb. "5x9+ 20" he lied. Your pirate ship's antenna must have been an adaptation of the venerable off-center fed zepp. There were two "birdcage" ocf Zepps in Anacortes pre WWII. Both driven by push-pull Taylor TZ-40's on 40 CW. 866a's ghostly blinking and transformers groaning in tune. Ah, yes! Must have been close to 200 watts! Old Chief Lynn |
FT-857 vs 706 MkII ?
In article ,
"Lynn Coffelt" wrote: Real Marine Radiomen always used Manual Tuners..... Bruce in alaska -- I love it! Thanks, Bruce...(c; The most radiation was from the light bulb....hee hee. Larry Don't knock the light bulb Larry! Late 50's sunspot cycle, I worked W7LAN in Washington State from Tucson, Arizona running 60 watt homebrew SSB/6146 rig into dimly flickering 50 watt light bulb. "5x9+ 20" he lied. Your pirate ship's antenna must have been an adaptation of the venerable off-center fed zepp. There were two "birdcage" ocf Zepps in Anacortes pre WWII. Both driven by push-pull Taylor TZ-40's on 40 CW. 866a's ghostly blinking and transformers groaning in tune. Ah, yes! Must have been close to 200 watts! Old Chief Lynn I have worked the old AT&T West Coast HF Marine Station, KMI, while running an N550, with the covers off, and feeding a Bird Kw Dummy Load, from the Engineering Department, of the Old Northern Radio Building, on West Commadore Way, in Seattle, Washington, on both 8 and 12 Mhz, with excellent Signal Reports. It is amazing what can happen when the Band is open........ Bruce in alaska Lordy, those were the days........ -- add a 2 before @ |
FT-857 vs 706 MkII ?
"Lynn Coffelt" wrote in
: 866a's ghostly blinking and transformers groaning in tune. Er, ah, I've survived a few mercury vapor flashovers....(c; Larry -- I have a new strategy to protect the Mexican border. From the border to inside the USA, 1 mile, we turn it into our OPEN PIT nuclear waste dump, turning it into a no-mans-land for tens of thousands of years. Anyone attempting to cross will simply be eaten alive by neutrons! Problem solved! |
FT-857 vs 706 MkII ?
"Lynn Coffelt" wrote in
: 866a's ghostly blinking and transformers groaning in tune. Speaking of flashovers...Have you ever seen this video of a transmission line switch disconnecting a shunt inductor across a transcontinental line in Colorado? http://www.youtube.com/watch?v=KUdGZ9Qg62o Most impressive....Even the power line guys were impressed.... The air starts ionizing when one of the switch insulators flashes over as it starts to open, probably from inductive kick of the massive inductor, then the ionized air heating to a million degrees RISES, drawing the arc ever higher, way way longer than gap of the open switch at full open. Plug "arcing" into the search engine on YouTube. There's lots of great flashovers to watch....(c; Larry -- I have a new strategy to protect the Mexican border. From the border to inside the USA, 1 mile, we turn it into our OPEN PIT nuclear waste dump, turning it into a no-mans-land for tens of thousands of years. Anyone attempting to cross will simply be eaten alive by neutrons! Problem solved! |
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