Re: [Elecraft_K3] TCXO Calibration methods
Mel Farrer <farrerfolks@...>
toggle quoted messageShow quoted text
From: "'David G3YYD' g3yyd2@... [Elecraft_K3]" <Elecraft_K3@...>
Sent: Thursday, January 11, 2018 2:00 AM
Subject: RE: [Elecraft_K3] TCXO Calibration methods
I use a very simple method.
CW mode on K3 tune in an on air standard frequency transmission. The higher the frequency the better but you need a reliable consistent signal.. I normally use either 10000KHz or 9996KHz (Russian TX ideal for UK). K3 for minimum bandwidth and display to Hz rather than 10 of Hz. Switch on auto CW tune and press spot button to auto tune the signal. The display will then show the offset from the standard. Adjust the K3 reference frequency value, auto tune again. Repeat as necessary.
Due to different modulation schemes can only do this when there is a carrier or CW keying. It is best to avoid doing this with a disturbed geomagnetic field or dawn/dusk on the path as the ionosphere height and propagation mode can be unstable causing some Doppler shift of the signal.
73 David G3YYD
From: Elecraft_K3@... [mailto:Elecraft_K3@...]
Sent: 10 January 2018 19:03
Subject: [Elecraft_K3] TCXO Calibration methods
I have found that the frequency display and my transmitted signal is off by ~80-100 Hz. Which of the three methods is the best?