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Author Topic: A "P" beacon note  (Read 1904 times)

Offline weaksigs

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A "P" beacon note
« on: December 03, 2014, 0425 UTC »
Though very difficult I scoped the signal variation on "P" and it appears to swing frequency
between about 8.497937  to  8.497743  ~   193 to maybe 200 hz on a rather rough and
difficult measurement.  Maybe this is a low battery problem now that I think about it causing
the oscillator to swing under load.  Only a guess....   :) ??? ??? ???
Central Florida
136' random wire for general HF,
Winradio Excalibur G31 & Kenwood TS-590

Peace!

Offline Teotwaki

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Re: A "P" beacon note
« Reply #1 on: December 08, 2014, 1522 UTC »
Thanks for the measurement! What time period is the swing occurring over? Minutes? Hours?
Jim
NRD-525, Elecraft KX3 and Elecraft PX3 Spectrum Display
76' end fed long wire & 66' off-center fed dipole for 10/20/40 meters
Orange County, SoCal, The better half

Offline weaksigs

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Re: A "P" beacon note
« Reply #2 on: December 09, 2014, 0053 UTC »
The frequency swing is measured roughly from turn on of the "P" to turn off of the "P".
Either the frequency is swinging, or as has been mentioned it is being modulated by
power supply hum and noise or another anomaly. I should have added this information
as perhaps not everyone can hear this beacon with a similar signal to noise ratio.

So plainly said its not a drift but an instantaneous frequency shift/modulation.
 ???
Central Florida
136' random wire for general HF,
Winradio Excalibur G31 & Kenwood TS-590

Peace!

 

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