On 11/20/2011 8:45 PM, Don Wilhelm wrote:
> down by 1.4 kHz. NOW, I can't resolve why everyone uses a downward
> shift of 1.5 kHz instead of a shift of 1.4 kHz - perhaps someone can
> explain that difference to me. I see nothing in the FCC documents that
> provides for a 100 Hz guard band which would increase the effective
> channel width to 3.0 kHz and thus yield a suppressed carrier shift of
> 1.5 kHz from the channel center. Mysteries, mysteries, mysteries - but
> that is the way we are told to do it, and the FCC has not complained so
> far - maybe just "let sleeping dogs lie" is the best recourse.
Enter stage left, the U S Coast Guard whose GMDSS (Marine
safety) SITOR (commercial version of AMTOR) transmissions say:
NMC GMDSS SITOR FEC BROADCAST
FREQUENCIES: 8416.5 KHZ
16806.5 KHZ
TIMES: 0015 AND 1735 UTC
NOTE: CARRIER OR DIAL FREQUENCY IS LOCATED 1700 HZ BELOW THE
ASSIGNED FREQUENCY (-1.7 KHZ).
On my (some say ancient) ICOM R-7000 HF receiver in FSK mode,
I set the dial 800 Hz below the assigned frequency. On my
TenTec RX 320D SDR HF receiver in LSB mode, I set the dial 2.19
kHz above the assigned frequency.
Mysteries indeed.
My K2 doesn't tune those frequencies so I can't comment on
that, but I do like the idea of setting the first five memory
channels for USB/data/RTTY mode in VFO A and for CW mode in
VFO-B. Cheap and easy solution.
-- 73 de K2ASP - Phil Kane
Elecraft K2/100 s/n 5402
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