[Lowfer] TACAMO on 27.2 kHz

[David L. Wilson]

I use an ICOM R9500 here that is GPS frequency stabilized and use waterfall
on the audio to measure the frequency.  I always use the center of the
shift.   MARK vs.  SPACE and usb vs. lsb lead to disagreements in
convention.

--
David L. Wilson

> -----Original Message-----
> From: Lowfer [mailto:lowfer-bounces at mailman.qth.net] On Behalf Of
> Graham
> Sent: Sunday, October 05, 2014 10:31 AM
> To: lowfer at mailman.qth.net
> Subject: Re: [Lowfer] TACAMO on 27.2 kHz
> 
> I have too and on my grabber 17.9 looks to be more 17.8 and 22.6 looks to
be
> more 22.7. Frequency lists typically show 17.8 and 22.7 so I have adopted.
I
> must take a bit of time of check the calibration my calibration.
> 
> The question then is, what are we considering the "frequency" - the center
> between MARK and SPACE of the various FSK/MSK transmissions or the
> MARK or the SPACE frequency
> 
> cheers, graham ve3gtc
> 
> On 2014-10-05 10:17, David L. Wilson wrote:
> >> Kurt, the most common frequency (in my experience) for TACAMO
> >> transmissions is 17.9 KHz, followed by 27.2, and then by 22.6. There
> >> are
> > other
> >> frequencies they can and do use but from my location in Eastern
> >> Ontario these are the ones I see most frequently. I have seen
> >> transmissions on
> > 31.6
> >> but that is very rare. The document to which Garry posted a link is a
> >> good reference.
> > I always have measured them as 17.8, 22.7, and 27.2.
> >
> >
> >
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