David,
I'm 70km north of London and have used the French 162kHz high stability
signal as well as RWM (Moscow) on 4.996, 9.996 and 14.996MHz for
frequency measurement and calibration before I got my Thunderbolt. RWM
is particularly good because part of the schedule involves sending
continuous carrier, which I used with SpectrumLab to calibrate
transceivers - you simply use SSB, offset the transceiver by 1kHz to get
an audio tone and measure the error using the waterfall on SPLab.
Yes, I can get the RWM on 14.996 MHz - so that's an excellent HF start.
The technique is prone to sound card errors but these can be quantified
and there are various tricks which can be used to minimise error,
probably better discussed by e-mail.
OK, but I'm probably OK for the moment.
I'd be (pleasantly) surprised if local FM transmissions operated to
time-nuts levels of stability, but I can assure you that air traffic
transmitters are probably not the way to go. Air traffic transmissions
have 25kHz spacings but some allocations have multiple transmitters at
different sites all using the same channel, but frequency offset from
each other to give wider coverage - and of course, with the exception of
VOLMET and ATIS transmissions, the signal is very intermittent.
Yes, it's been a bit hit-and-miss, and I suspect that all of the local
transmitters were aligned by the same team, perhaps even the same
instruments. Quite close agreement, but are they correct?
Your best bet would probably be to get hold of a Thunderbolt as I did,
you can also feed the 10MHz output to a set of dividers if you have
test gear which can use external an external frequency reference - very
useful.
Regards,
David, Milton Keynes, UK (G4IRQ)
Something like a T/B but using a pre-amped puck antenna would be ideal for
here.
Many thanks for your help.
73,
David GM8ARV
--
SatSignal software - quality software written to your requirements
Web: http://www.satsignal.eu
Email: [email protected]
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