|[AMRadio] RE:Carrier with one sideband|
km1h at jeremy.mv.com
Fri Feb 8 21:24:24 EST 2008
The USAF also used AM linears. I have a Rockwell Collins 648B-1 amp that was
used in the Looking Glass program. It uses a big GE tetrode with 2500W plate
dissipation in a cavity and operates in the 350 MHz region.
Ive also been told that Air Force 1 uses a similar AM linear.
----- Original Message -----
From: "D. Chester" <k4kyv at charter.net>
To: <amradio at mailman.qth.net>
Sent: Friday, February 08, 2008 7:10 PM
Subject: Re: [AMRadio] RE:Carrier with one sideband
>> I seem to remember that the aircraft radios we used during the 60-80s in
>> P-3s/C-130s etc (ARC-94/102 aka 618T) had a
>> selection called AME (AM equivalent). It was explained to us (pilots)
>> by the techs that it wasn't a
>> high level AM, but USB with carrier. It sounded OK, but then again, it
>> was designed for communications
>> and not "easy listening"! All the airways communication now days is
>> SSB, so the AME position rarely
>> gets selected.
>> Perhaps someone is familiar with that mode and can expand on it.
>> 73 Tom/W4OKW
> Aircraft VHF radios still use full carrier AM. I have a small Radio Shack
> portable with the aircraft band, and there is a lot of AM traffic on it. I
> purchased it mainly to use as a tool for sniffing out power line noise.
> The reason they use AM instead of FM is the capture effect of FM. With
> AM, when a strong signal is on frequency, a weaker one can still be heard
> under the stronger one. It would be a catastrophe waiting to happen if
> aircraft used FM radios and a stronger signal completely overrode,
> particularly near a busy airport. Also, I seem to recall something about
> SSB being less than satisfactory due to the shift in frequency due to the
> Doppler effect, with high speed jet aircraft.
> Don k4kyv
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