Posted by
Don Wilhelm-2 on
Jun 18, 2004; 5:26am
URL: http://elecraft.85.s1.nabble.com/K1-on-USB-CW-tp367868p367890.html
I just looked at my old copy of the NEW Sideband Handbook by Don Stoner
W6TNS, copyright 1958 - I have 6th printing dated June 1966.
Page 94 shows the schematic of the Central Electronics 10B phasing exciter -
and it DOES generate SSB at a fixed 9 MHz (unchanged from the 10A). The
addition of a 5 to 5.5 MHz VFO will allow it to cover both 75 and 20 meters.
I do recall conversations among SSB ops about the sideband selection for the
various bands, but I cannot recall the details. For many years, I thought
the sidebands were flipped between 75 and 20 meters with this 9 MHz
generator and the 5 to 5.5 MHz VFO, but then I saw the math which says the
sidebands did NOT flip with this mixing scheme - Oh well, the conventions
are well glued in place - who will be real pioneers and campaign to get
everyones mindset changed? Anyone for no QSOs? <G>
73,
Don W3FPR
Life is what happens when you are making other plans
----- Original Message -----
> It goes back to the original "SSB Jr." which was ultimately the basis for
the FIRST
> real commercially built SSB transmitter, the Central Electronics 10A.
> It was a phasing rig and, the SSB selector was simply labeled SB1 and SB2.
> Since 75 and 20 were the "popular" bands then for SSB (there wasn't a 40
meter
> "phone" band back then!) the operators were "lazy" and used the SB1
> position for both bands (as I remember) yielding LSB for 75 and USB for
20.
> Commercially and on the marine bands, USB has been the standard since day
1
> and far as I know. Why the amateurs have hung onto this old LSB on 40
> and below thing I don't know. I forget whether the 10A/10B/20A used a
> 5 or a 9 mhz channel for SSB generation, but it DID "flop over" when
> you went from 20 to 75 meters! Must have been generating SSB at 5 Mhz.
> Anyhow that IS how that LSB/USB phenomenon got started: just plain
> laziness!
> Maybe one day they will mandate USB as the "normal" sideband? Didn't
> they state that on the 60 meter channels? (USB only?) I'm sure that was
> to get around the stupidity of the "monitoring" personnel who obviously
> used receivers with USB filters only and they didn't know CW! I thought
> it was a stupid move to "channelize" the 60 meter band on SSB only!!!
> I supposed ARRL has too many irons in the fire now with the "rehashing"
> of the amateur classes/privileges and BPL to worry about 60 meter
> mode expansion?
>
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