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Noisy Guest
Hey y'all, Happy New Year!!
I recently bought a $135 Guest brand 10A (2x5) battery charger. The raterfratzer generates so much RF that it blanks my child bride's Icom 706 Mk2G on all bands even tho it's on a different power supply! It even garbages up my 448.475 repeater that has it's own internal supply! Arggggg! Got any ideas on how to quiet it down? I tried ferrite beads t no avail. Know of any quite, affordable automatic chargers in the 10A range? TIA, K3DWW |
Noisy Guest
I have to turn off the Guest on Lionheart to use HF. It radiates 20
over S9 noise into the Icom M802's insulated backstay. I tried to make a Faraday shield for it out of tin foil, but it radiates into the AC line cord so bad it was useless. I can't shield it all the way up the dock. You should hear what an Adler-Barbour 12V electronic-controlled fridge does to Channel 16, the only channel it eats.....with a throbbing, bzzt-----bzzt------bzzt bzzt bzzt that will drive you NUTS! 73 DE W4CSC CHARLESTON On Wed, 31 Dec 2003 08:40:52 -0500, "Vito" wrote: Hey y'all, Happy New Year!! I recently bought a $135 Guest brand 10A (2x5) battery charger. The raterfratzer generates so much RF that it blanks my child bride's Icom 706 Mk2G on all bands even tho it's on a different power supply! It even garbages up my 448.475 repeater that has it's own internal supply! Arggggg! Got any ideas on how to quiet it down? I tried ferrite beads t no avail. Know of any quite, affordable automatic chargers in the 10A range? TIA, K3DWW |
Noisy Guest
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Noisy Guest
On Thu, 01 Jan 2004 18:09:47 GMT, Shortwave Sportfishing
wrote: I think it's gotta be the switching power supplies - I have the same problem on my Contender - it is annoying. Any electronics that "switches" is a big transmitter. It generates harmonic-rich square waves and pulses. I've wondered if building something solid state and cascade the voltage if that would help the situation any? No, actually the solution is quite simple. Go back to the old, reliable analog chargers that simply put out pulsating DC voltages to the battery and when you noticed the current dropping off, you turned the charger off manually or had a saturable reactor that would taper the charge. The old chargers without the switching electronics we're in love with, made no radio noise at all...... |
Noisy Guest
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Noisy Guest
On Fri, 02 Jan 2004 13:02:37 GMT, Shortwave Sportfishing
wrote: Until the transformers go soft. ;) S'plane to me how transformers "go soft"?? |
Noisy Guest
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Noisy Guest
Heck, I've got a Astron RS-30a under my desk that is noiser than hell
and has been since I bought it WAY back when. :) The noise of an offline switcher could be as loud as these. But this will be at 10-20 Kilo Herz. The possibilty to vacuum inject epoxy is the same with standard transformers as with high frequency switch mode transformers. michael |
Noisy Guest
On Sat, 03 Jan 2004 11:52:46 GMT, Shortwave Sportfishing wrote:
On Sat, 03 Jan 2004 04:15:31 GMT, (Larry W4CSC) wrote: On Fri, 02 Jan 2004 13:02:37 GMT, Shortwave Sportfishing wrote: Until the transformers go soft. ;) S'plane to me how transformers "go soft"?? You've been around as long as I have, don't tell me you've never had a transformer loosen it's windings, or the varnish disintegrate on the wire causing transformer noise - both RF and mechanical. Heck, I've got a Astron RS-30a under my desk that is noiser than hell and has been since I bought it WAY back when. :) No flame intended, but I've been involved with electronics since I was first licensed in 1954 and can count the number of transformers which have loosened up on the fingers of one hand! Really, Larry's right - the old analogue chargers were and are far less noisy. -- Larry W1HJF (ex K2QDO, ex KN2QDO) email is rapp at lmr dot com |
Noisy Guest
On Sat, 03 Jan 2004 11:52:46 GMT, Shortwave Sportfishing
wrote: On Sat, 03 Jan 2004 04:15:31 GMT, (Larry W4CSC) wrote: On Fri, 02 Jan 2004 13:02:37 GMT, Shortwave Sportfishing wrote: Until the transformers go soft. ;) S'plane to me how transformers "go soft"?? You've been around as long as I have, don't tell me you've never had a transformer loosen it's windings, or the varnish disintegrate on the wire causing transformer noise - both RF and mechanical. A buzzing loose core doesn't change transformer operation, that I ever saw. Hell, if that was so, half the flourescent lights in any WalMart would be dark! Heck, I've got a Astron RS-30a under my desk that is noiser than hell and has been since I bought it WAY back when. :) Junk it. I did mine. If that damned series pass transistor ever shorts, you can kiss all your equipment hooked to it good bye when the 20-some volts hits them. I don't use analog, series pass regulated power supplies, here. The ham shack 12V equipment all runs off a bank of 90-year-old Nickel-Iron cells I got from a demolished Holiday Inn. They provide about 800AH at 14VDC and are charged by a WalMart automatic shutoff 10A charger all mounted under the house. This power supply provides the 120A 14VDC to power my highly-modified TenTec Hercules II solid state HF linear amp, about 650W OUTPUT. It also powers all the VHF, scanners, and other 12V toys cluttering up the desk. It's hooked to a 1KW Tripplite UPS that powers the desk light and computers/monitors/modems/routers and other network toys in power outage. The lights in here don't ever blink...(c; One of my neighbors came over to ask if I knew why the power was off. Seeing my computer running on the net, he thought his house was down. I told him my power was off, too, and I had called it in. Batteries don't hum and go ballastic with high voltage to destroy everything like series-pass analog power supplies....yecch! Later, Tom S. Woodstock, CT ---------- "I object to fishing tournaments less for what they do to fish than what they do to fishermen." Ted Williams - 1964 |
Noisy Guest
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Noisy Guest
I just made a honey of a deal on Honda's biggest inverter 3KW genset,
the EU3000is. I was bringing my little 1KW back for warranty service on the carb and this guy with a 5th wheel camper was unloading it onto the tailgate of his Dodge dually diesel pickup. "How do you like the 3KW?", I asked him. He said it was fantastic but wouldn't start his 15KBtu roof A/C and he was bringing it back to this dealer to trade it in on a camper twin Honda. I asked him how much he wanted for this one and he thought a minute and said $1800. I started it, hell it was brand new. "I'll give you $1500 cash within 30 minutes as soon as I go home to get it.", I tried. "Hmm...well, that's more than they're gonna give me on a trade. Deal!" We met at my bank to notarize the bill of sale and get away from the dealer's salesman that looked like he was going to kill me...(c; $1800 is the internet price. Dealer retail is $2K with prep and ad-on taxes about $2400. Man, you can hardly hear this little box run. SO quiet..... Why the boat genset manufacturers don't buy Honda's technology and make an econo-speed inverter genset is crazy. Engine speed has nothing to do with frequency. Until the load on it get over 1200 watts, the engine stays near its low economy speed around 1000 RPM. The 3.4 gallon tank will power a 750W load for TWENTY HOURS! With piston speeds so low, (even at full load it's only running 2500 RPM, not a constant 3600 RPM) it should last a lifetime. Output is 60.00007 Hz at no load and 60.0036 Hz at 3000 watts on my counter. Output voltage varies by 8 volts from no load to 3KW. The sine looks very clean on my scope with very little distortion, even at full load. It's much cleaner than a Heart in a boat. And there's NO dip in power as you jerk a hard load onto it. Must have some hefty filter caps in the inverter's input rectifiers. The actual alternator is a 3 phase, high voltage tiny little thing. Dry weight with the internal fiberglass Super Quiet case inside a square steel outer case is only 130#. Two can lift it easily and there is a wheel kit for it if you want. http://www.hayesequipment.com/eu3000is.htm Too bad its exhaust is impossible to weld and output dry stack to. It's all wrapped up inside the fiberglass and cooled with the blower in the engine. It'd make a helluva nice sailboat genset so compact. It's noise level is less than someone talking! The cabinet doesn't even get warm! It'd be so easy to make a boat model. Guess there isn't a market for it. |
Noisy Guest
On Sun, 04 Jan 2004 03:18:07 GMT, Larry W4CSC wrote:
....snip Junk it. I did mine. If that damned series pass transistor ever shorts, you can kiss all your equipment hooked to it good bye when the 20-some volts hits them. You probably know this, but you can (actually, must) prevent that happening by putting a "crowbar" circuit across the output, after the fuse. This is just a large scr with a resistor from the bus to the gate with a 14 or 15 volt zener to ground. It doesn't conduct until the voltage exceeds the zener limit and then the scr shorts to ground, blowing the fuse and protecting the equipment. -- Larry W1HJF email is rapp at lmr dot com |
Noisy Guest
On Sun, 04 Jan 2004 16:10:10 GMT, Larry wrote:
On Sun, 04 Jan 2004 03:18:07 GMT, Larry W4CSC wrote: ...snip Junk it. I did mine. If that damned series pass transistor ever shorts, you can kiss all your equipment hooked to it good bye when the 20-some volts hits them. You probably know this, but you can (actually, must) prevent that happening by putting a "crowbar" circuit across the output, after the fuse. This is just a large scr with a resistor from the bus to the gate with a 14 or 15 volt zener to ground. It doesn't conduct until the voltage exceeds the zener limit and then the scr shorts to ground, blowing the fuse and protecting the equipment. Nifty - I think I'll do that. Thanks. Later, Tom S. Woodstock, CT ---------- "We may say of angling as Dr. Boteler said of strawberries: Doubtless God could have made a better berry, but doubtless God never did and so, if I might be judge, God never did make a more calm, quiet, innocent recreation than angling." Izaak Walton "The Compleat Angler"(1653) |
Noisy Guest
Got a call from Champion Honda that my little 1KW inverter EU1000i was
repaired (they replaced the carb as I suggested), this morning. Went over and was handed a $159 bill for the warranty service. After making a little....well a lot....of noise, I was told to leave the generator (bill not paid) and they'd call Honda about warranty payment. I'd like to publically thank Honda Power Products for settling with my dealer, this afternoon. Honda picked up the bill. I didn't even pay for the spark plug it didn't need (replaced 2 weeks ago) or the "valve adjustment" the technician sold me on the phone it didn't need. The new carb runs fantastic. Doesn't even have to be choked from cold! THANKS HONDA! I'LL BUY SOME MORE!! Larry EU1000i 1KW inverter genset EU3000IS 3KW inverter genset EG5000X 5KW genset Honda self-propelled lawn mower and my previous 12 Honda motorcycles, including the 305 Dream I've regretted selling since the 60's! |
Noisy Guest
On Sun, 04 Jan 2004 16:10:10 GMT, Larry wrote:
On Sun, 04 Jan 2004 03:18:07 GMT, Larry W4CSC wrote: ...snip Junk it. I did mine. If that damned series pass transistor ever shorts, you can kiss all your equipment hooked to it good bye when the 20-some volts hits them. You probably know this, but you can (actually, must) prevent that happening by putting a "crowbar" circuit across the output, after the fuse. This is just a large scr with a resistor from the bus to the gate with a 14 or 15 volt zener to ground. It doesn't conduct until the voltage exceeds the zener limit and then the scr shorts to ground, blowing the fuse and protecting the equipment. -- Larry W1HJF email is rapp at lmr dot com Oh, I know. Does it have an output fuse? Mine didn't, just the AC line. |
Noisy Guest
On Tue, 06 Jan 2004 06:18:18 GMT, Larry W4CSC wrote:
On Sun, 04 Jan 2004 16:10:10 GMT, Larry wrote: On Sun, 04 Jan 2004 03:18:07 GMT, Larry W4CSC wrote: ...snip Junk it. I did mine. If that damned series pass transistor ever shorts, you can kiss all your equipment hooked to it good bye when the 20-some volts hits them. You probably know this, but you can (actually, must) prevent that happening by putting a "crowbar" circuit across the output, after the fuse. This is just a large scr with a resistor from the bus to the gate with a 14 or 15 volt zener to ground. It doesn't conduct until the voltage exceeds the zener limit and then the scr shorts to ground, blowing the fuse and protecting the equipment. -- Larry W1HJF email is rapp at lmr dot com Oh, I know. Does it have an output fuse? Mine didn't, just the AC line. The Astron 40 I just checked didn't. I added one in series and stuck the crowbar after it. It does have foldback current limiting, but that won't necessarily protect equipment connected to it. -- Larry W1HJF email is rapp at lmr dot com |
Noisy Guest
On Tue, 06 Jan 2004 18:35:30 GMT, WaIIy
wrote: On Tue, 06 Jan 2004 06:17:15 GMT, (Larry W4CSC) wrote: and my previous 12 Honda motorcycles, including the 305 Dream I've regretted selling since the 60's! Boy, those Honda Dreams were the envy of every guy in the neighborhood. Heck, I was happy with my Whizzer, though. Best, most troublefree motorcycle I ever owned...... The red plastic fenders never rusted a bit! |
Noisy Guest
Foldback current limiting assumes the pass transistor doing the
folding back is a functional device, not welded from E to C....(c; On Tue, 06 Jan 2004 15:30:54 GMT, Larry wrote: On Tue, 06 Jan 2004 06:18:18 GMT, Larry W4CSC wrote: On Sun, 04 Jan 2004 16:10:10 GMT, Larry wrote: On Sun, 04 Jan 2004 03:18:07 GMT, Larry W4CSC wrote: ...snip Junk it. I did mine. If that damned series pass transistor ever shorts, you can kiss all your equipment hooked to it good bye when the 20-some volts hits them. You probably know this, but you can (actually, must) prevent that happening by putting a "crowbar" circuit across the output, after the fuse. This is just a large scr with a resistor from the bus to the gate with a 14 or 15 volt zener to ground. It doesn't conduct until the voltage exceeds the zener limit and then the scr shorts to ground, blowing the fuse and protecting the equipment. -- Larry W1HJF email is rapp at lmr dot com Oh, I know. Does it have an output fuse? Mine didn't, just the AC line. The Astron 40 I just checked didn't. I added one in series and stuck the crowbar after it. It does have foldback current limiting, but that won't necessarily protect equipment connected to it. -- Larry W1HJF email is rapp at lmr dot com |
Noisy Guest
On Wed, 07 Jan 2004 03:15:02 GMT, Larry W4CSC wrote:
Foldback current limiting assumes the pass transistor doing the folding back is a functional device, not welded from E to C....(c; On Tue, 06 Jan 2004 15:30:54 GMT, Larry wrote: On Tue, 06 Jan 2004 06:18:18 GMT, Larry W4CSC wrote: On Sun, 04 Jan 2004 16:10:10 GMT, Larry wrote: On Sun, 04 Jan 2004 03:18:07 GMT, Larry W4CSC wrote: ...snip Junk it. I did mine. If that damned series pass transistor ever shorts, you can kiss all your equipment hooked to it good bye when the 20-some volts hits them. You probably know this, but you can (actually, must) prevent that happening by putting a "crowbar" circuit across the output, after the fuse. This is just a large scr with a resistor from the bus to the gate with a 14 or 15 volt zener to ground. It doesn't conduct until the voltage exceeds the zener limit and then the scr shorts to ground, blowing the fuse and protecting the equipment. -- Larry W1HJF email is rapp at lmr dot com Oh, I know. Does it have an output fuse? Mine didn't, just the AC line. The Astron 40 I just checked didn't. I added one in series and stuck the crowbar after it. It does have foldback current limiting, but that won't necessarily protect equipment connected to it. -- Larry W1HJF email is rapp at lmr dot com Good point! -- Larry W1HJF email is rapp at lmr dot com |
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