[time-nuts] Doppler and FMT

Bob Camp lists at rtty.us
Thu Sep 19 19:37:19 EDT 2013


Hi

Remember - there's more than one station on 5, 10, 15 and 20 MHz. You may be picking up the modulation from one of them. Ionospheric shift can easily give you a few Hz on HF. 

Back when I was doing FMT stuff there was no ionosphere involved. I was within ground wave of Newington ….

Bob 
On Sep 19, 2013, at 9:48 AM, quartz55 <quartz55 at hughes.net> wrote:

> I was playing with SpecLab and my TS-2000 just to see how accurately I could measure frequencies in the HF region.  I notice when I set the rx on cw and listen to the 750 Hz output of WWV at 15 or 20 MHz with SL, I get like 2 and sometimes more tracks about 2 Hz apart constantly shifting around. I assume this is Doppler going in and out?  If that's so, how can anyone reasonably expect to measure any ionospheric HF signal in the mHz range?
> 
> Dave
> N3DT
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