Posted by
Don Wilhelm-3 on
Apr 10, 2005; 9:28pm
URL: http://elecraft.85.s1.nabble.com/Musings-on-Zeroing-in-on-WWV-tp376867p376868.html
Ron,
You are doing it right - even if the BFOs for LSB and USB are severly
misaligned, the voice should still be 'similar' in that the pitch should not
change, although it may sound a bit muffled on one or both sidebands because
the lows (or highs) may not be at the proper amplitude for a good voice
response because they are not inside the passband.
The only caution that I can offer on your CW method is that some folks have
trouble matching the pitch, and also during the times WWV is transmitting a
tone (either 500 or 600 Hz), it is easy to zero on the tone instead of the
carrier - if you find yourself off by 500 or 600 Hz, that may be the
explaination - double check during the minutes when no tone is transmitted.
Since my hearing is shot too, and I don't possess the gift of perfect pitch,
I prefer to use LSB only and look for the tones at the proper pitch with
Spectrogram - you can get within 10 Hz (limit of the K2 dial steps) or
closer with ease - to me that is the easiest and the most accurate, and you
don't have to monkey with calculating the CW offset stuff.
73,
Don W3FPR
> -----Original Message-----
> Greetings.
> Several times on this Reflector we see posts telling people
> to "tune into WWV exactly". Well....if any readers on the Reflector have
> shot hearing like mine that could present a difficulty.
> Here is what I do, and I imagine it is close enough for me without
> instruments. I will no doubt be corrected if I have it wrong.
> I tune into WWV in CW mode and use the SPOT tone to zero beat with the WWV
> tone. Then, if I switch to LSB or USB the announcer should sound
> the same on
> either sideband (ie the pitch of the announcement shouldn't change.)
> I guess having USB and LSB sounding the same will also depend on how
> accurately the BFO has been set for each sideband.
> Just checked my K2 with this method after it has been running the last 5
> hours and it shows I am 80hz off frequency... close enough that I won't be
> trying to get it any better.
> I wonder how close we used to be with the Analog dials we used to
> use? ( You
> *did* use a radio with Analog tuning didn't you?) Turning the clock back
> even a bit further, to the days of the homebrew SSB rigs.
> Remember the band
> marker xtal you used,to make sure you stayed in band? How times
> have changed
> when we can build a kitset rig that can stay withing a few hz resolution.
> Cheers......Ron ZL1TW
>
>
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