[Lowfer] 8822 Hz on at 2200Z
Dexter McIntyre W4DEX
dexter.mc at gmail.com
Wed Dec 17 18:14:41 EST 2014
Garry wrote:
>
> I got a tantalizing "signal" peak for a couple of hours around noon
> local time (1800Z). A marker from my GPS-locked SLM is a bit low, but
> the "signal" is even lower if the intent is to be exactly on 8822.0
> Hz. I recall your Nov 30 note where Paul Nicholson reported your
> signal 0.01 Hz low, so it's possible the "signal" is really W4DEX.
Garry,
The .01 Hz low signal was determined not to be mine. I had announced a
GPS locked 8822 transmission but when it didn't show up as expected on
the Forrest, VA site I discovered the HP SLM 10 MHz ref input cable from
the Z3801 was open due to stress on the cable pulling the BNC pin out so
it wasn't making contact. So with the internal reference oscillator
loop back cable connected the SLM was free running much farther off
frequency than 0.01 Hz. That was corrected then the signal showed up on
the VA spectrum dead on freq. Paul had high confidence in the frequency
accuracy of the Forrest VA site. Here a current plot showing the signal:
http://46.4.26.83/sp8822_vlf35.png
I believe Paul has it updating at either 10 or 20 minute intervals.
> I should look into tying my soundcard sampling rate to 1pps GPS ticks.
I've been recently trying to accomplish that here with SpecLab. Looks
like SpecLab is seeing the GPS pulse but wont lock in. I'll work on
this a while longer before I give up and ask for help :)
> I've begun running Spectrum Laboratory with an FFT size of 131k. The
> software isn't likely to even acquire by the time you QRT (it will
> take about 5 hours, and even longer for the waterfall to display
> results), but I'll let it run over night and perhaps you'll transmit
> again tomorrow.
The 8822 Hz carrier has been on for over 26 hours now and is running
stable at a bit over 1 amp to the wire. I plan to let it run overnight
unless something unusual happens.
Speaking of unusual, I have a constant high frequency tone in my head.
Figured I was hearing the amp while in the shack and the coil when near
it. But when I went down the drive to get the mail I was still hearing
it. That's over 500 feet from the antenna. Wife and cat seem to be
normal but maybe I should advise someone if something strange happens to
us so they will have a clue as what may have been the cause.
Dex
>
> 73, Garry, K3SIW
>
>
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