Freq Analysis mode on FLDIGI

[g0ukb-aeB/[e-mail] [linuxham]]

A big thanks for adding this. I recently Ebay'd a cheap Chinese TXCO for my Kenwood TS-590. Using the freq analysis mode with WWV I was able to determine that it was working to spec (c5Hz drift over 2 hours) and also was fairly accurately calibrated out of the box, starting a couple of Hz low and eventually settling a couple of Hz high.


Trying to do this sort of measurement without FLDIGI's freq analysis mode would have been quite difficult and the csv file means it is really simple to produce a graph to show the TXCO's characteristics.


Brian G0UKB

[Richard Kriss [e-mail] [linuxham]]

Brian G0UKB,

This is how I use fldigi to tweak the pot to on the SO-3 to calibrate my TS-590S

Loading Image...

I was not aware of the fldigi option you mentioned to output the reading to a csv file. I would like to know what steps you took to get the output.

FYI. I had mine pretty close but asked Kenwood to check it when the rig was returned for the power spike mode. They tweaked it in for me and it came back right on the money.

Dick AA5VU

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Posted by: Richard Kriss <aa5vu-***@public.gmane.org>
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[Ed [e-mail] [linuxham]]

Post by Richard Kriss aa5vu-***@public.gmane.org [linuxham]
Brian G0UKB,
This is how I use fldigi to tweak the pot to on the SO-3 to calibrate my TS-590S
http://www.qsl.net/aa5vu/fldigi-FreqAnalysis.png
I was not aware of the fldigi option you mentioned to output the
reading to a csv file. I would like to know what steps you took to
get the output.
FYI. I had mine pretty close but asked Kenwood to check it when the
rig was returned for the power spike mode. They tweaked it in for me
and it came back right on the money.
Dick AA5VU

http://www.w1hkj.com/FldigiHelp-3.21/html/frequency_analyzer_page.html

Ed


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Posted by: Ed <autek-***@public.gmane.org>
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[Richard Shaw [e-mail] [linuxham]]

Post by Richard Kriss aa5vu-***@public.gmane.org [linuxham]
Brian G0UKB,
This is how I use fldigi to tweak the pot to on the SO-3 to calibrate my TS-590S
http://www.qsl.net/aa5vu/fldigi-FreqAnalysis.png
I was not aware of the fldigi option you mentioned to output the reading
to a csv file. I would like to know what steps you took to get the output.
FYI. I had mine pretty close but asked Kenwood to check it when the rig
was returned for the power spike mode. They tweaked it in for me and it
came back right on the money.

I'm not sure what the factory tolerance is for my DX-70 but how close is
considered close enough? I've never had any complaints about being off
frequency. I tried it out and mine was just barely off, all 9's until the
decimal point and with FLDigi tracking WWV it varied over the last two
digits.

Thanks
Richard
KF5OIM

[Brian Jones g0ukb-aeB/[e-mail] [linuxham]]

Dick - I did pretty much as you did, although I used CW and WWV was 800Hz
up (my CW pitch is still the default for the TS-590).

It's a really cool tool for checking frequency accuracy and stability. The
csv file is generated automatically with a data point every second. It was
in .fldigi/temp and called analysis.csv. I just left things running for an
hour, copied the csv file to my home directory and then opened it in Libre
Office and used the data to graph my freq over time to show stability.

Richard - this stuff never bothered me before - I'd always assumed that the
manufacturer would calibrate the rig and if I didn't fiddle then all would
be OK. However in this case I'd just fitted a cheap Chinese TXCO to my
TS-590S and had no idea a) if it was actually calibrated anywhere near and
b) if it actually was temperature controlled and so much more stable than
the default oscillator on the TS-590.

This neat feature in FLDIGI showed me it was pretty much spot on in both
counts!

Brian G0UKB

[Richard Kriss [e-mail] [linuxham]]

Brian G0UKB,

Thanks for the comments. I did a quick check on my TS-590S after it was returned from Kenwood for the power spike mod and the calibration of the SO-3 looked good. When I first calibrated mine, I did not notice the fldigi data outputs and just tweaked it to get the frequency readings close to the WWV tones. The next time I need to calibrate I will have to read the fldigi docs.

It is good to know the lower cost TXCO works.

73 Dick AA5VU

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Posted by: Richard Kriss <aa5vu-***@public.gmane.org>
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