Re: [Amps] S/S Amp's

["Carl" <km1h@jeremy.mv.com>]

The huge majority of AMers these days keep the BW to between 6-9KHz and with 
very low distortion the adjacent channel is quiet.
I run the TS-950SD at 3200Hz per SB on both modes and the vintage gear up to 
about 4200 tops. Going to about 6kHz does improve intelligibility when 
signals are weak and that can be done before the rig with an equalizer or in 
the audio chain with an in-out LPF.
Even 3KHz can sound good with a D-104 or some equalizing to give a high end 
boost to other mikes.
The worst thing is a flat response mike into a rice box with a flat 
response.
Most vintage gear had a high side boost since they generally used cheap 
driver and mod iron that trimmed the bass by default.
When I was in the USN and we finally got permission to operate /MM I started 
running phone patches on SSB with the Collins URC-32. There were lots of 
repeats and I asked permission to run the old TBK with about 500W carrier of 
full AM; no more repeats...you all know what a kid or a female sounds like 
on SSB!
Carl
KM1H


----- Original Message ----- 
From: "Jim Thomson" <jim.thom@telus.net>
To: <amps@contesting.com>
Sent: Friday, September 13, 2013 1:58 AM
Subject: Re: [Amps] S/S Amp's


> 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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