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

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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 @