[Elecraft] Re: USB on all bands ??

[Sandy]

As long as I worked for Marconi Marine and later Mackay Radio, I don't ever 
remember having a shipboard receiver that would work lower sideband.  I have 
a Siemens E-410 solid state set that is absolutely top notch and has 
provisions for a LSB module, but I have never been able to find one!  The 
DEBEG guys in Germany, who I got a service manual from never recalled even 
seeing a LSB module.  I had a couple of them\ looking in flea markets there 
and they never turned up one.  Letters to DEBEG and Siemens turned up 
nothing.  Siemens says they didn't make many modules and had none in stock 
at any price.

I had a PRC-74 for a good while and finally sold it as there was no LSB. 
Helluva a good working and very rugged radio.

73,

Sandy W5TVW

----- Original Message ----- 
From: "Mike Morrow" <kk5f at earthlink.net>
To: <elecraft at mailman.qth.net>
Sent: Sunday, May 25, 2008 11:07 AM
Subject: [Elecraft] Re: USB on all bands ??


> >The convention currently in use is merely traditional and reflects
>>military preference for standardization (due to channelization)
>>promulgated in the early days of SSB.
>
> LSB use on 40m and below is *strictly* a HAM convention.  Military,
> commercial marine, and civil aviation standardized on USB from the
> very earliest days of the SSB era.
>
> Almost all *early* non-shipboard US military sideband sets offered
> *only* USB mode.  This includes the late 1950s USAF AN/ARC-65 and
> the USN AN/ARC-38A sets for aircraft, and the AN/GRC-106 and AN/PRC-47
> for ground service.  These were among the earliest SSB sets in common
> military use.
>
> The succeeding generation of sets offered selectable sideband.  This
> includes the USAF AN/ARC-58, USN AN/ARC-94 (618T-2), AN/FRC-93 (KWM-2A),
> AN/URC-32, AN/URC-58 and AN/GRC-165 (Harris RF-301), AN/PRC-74,
> RT-618/URC, T-827/URT, R-1051/URR, etc.  But these all date from the
> early 1960s and later, long after HAMs had settled on LSB on 40m and
> below.
>
> Even though some later sets offered LSB, or even ISB, it was almost
> never used.  When I was associated with US military communication systems,
> the only time I ever saw LSB used on a military frequency was on Military
> Affilliated Radio System (MARS) nets.  Since MARS is comprised mainly
> of HAMs, years ago *some* circuits followed the HAM convention for net
> frequencies below about 7.5 MHz.  But even MARS eventually went
> completely to USB.
>
> Mike / KK5F
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