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" <[EMAIL PROTECTED]>
To: <[email protected]>
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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