Date: Thu, 12 Sep 2013 21:49:44 -0400
From: "Carl" <km1h@jeremy.mv.com>
To: "Fuqua, Bill L" <wlfuqu00@uky.edu>, "Joe Subich, W4TV"
<lists@subich.com>, <amps@contesting.com>
Subject: Re: [Amps] S/S Amp's
By using the Exalted AM method that goes back 70 years you dont need a fancy
radio.
Modify the BFO for variable injection level and connect to the last IF
thereby maintaining AGC. Its almost as good as a sync detector for selective
fading and its easier to follow a slightly drifting carrier.
Carl
KM1H
## There is this huge group here on the west coast that does this AM gig..
every wed night on 80M. Loads of boat anchor AM ham gear + converted
and modified commercial 550-1600 1-5 kw gear. NOBODY is on freq
ever. Everybody is off a bit up or down...and some will drift 50-100 hz
during
their turn to talk. Now this is just trying to zeo beat em, with xcvr on
SSB..with
a 6 khz wide filter...and rock solid and calibrated TCXO.
## I have used the synchronous AM detector in my MK-V..and it works superb
on AM signals. For once, I can hear the full 9700 hz wide audio across the
550-1600 band at night. Funny thing is, just about any AM radio in any vehicle
only results in at most maybe 6-7 khz at the top end. Same deal with most
high end
audiophool gear.
## 6 khz wide ESSB, 3khz wide DSB AM with cxr, 3 khz wide DSB, suppressed cxr,
who cares, in each case they all eat up 6 khz of RF BW. Its all good fun and
the bands are dead
anyway. Now if you want to use 6 khz wide audio on AM.... you eat up 12 khz
of RF BW.
## 6 khz wide ESSB eats up 1/2 the BW. Wideband SSB is a bit of a trick on
RX..esp
if a lot of low freq content is used. You cant be more than just a few hz
off the other guys freq,
or it all goes to hell..fast. Hence the use of a min of a .5 ppm TCXOs....
that have been calibrated dead on
at least 15 mhz wwv... and pref 20 mhz wwv. A .25 ppm TCXO..also
calibrated..is even better.
## ESSB ops don’t tune each other in....they know the other guy is gonna be on
an even freq to begin
with.... like 3820...... or 3825.... or 3820.6 etc.
## The vfo display on any MK-V will display in .625 hz increments...aka
5/8 hz.
## any of the above modes, AM, DSB, etc all sound a helluva lot better than
the pinched off
300-2700 crap that has been stuffed down our throats..and doesn’t work anyway.
You can
laff.... but I havent used phonetics since 2001. No need to once the top end
gets up to 3950 hz.
later........... Jim VE7RF
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