[NLRS] SBMS monthly meeting Thursday 9PM CDT

[Doug Reed]

An addendum to the info by G0MRF relating to adding a TCXO to the
Octagon LNBC....
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Hi all.
FYI. I measured the warm up drift of a standard Octagon LNB and in 30
minutes it drifted 34kHz. - OK, after 20 mins it was probably
'usable'.

After removing the 27MHz crystal and replacing it with a Conner
Winfield TCXO the drift was down to 900Hz in 30 mins, with no drift
(<50Hz) in the final 5 mins.

It may be worth avoiding some of the Fox TCXOs as they have internal
digital correction which causes the frequency to jump in steps of
100Hz + at a time.

73 David G0MRF
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More links to search:
"replacing the crystal with a TCXO (David, G0MRF in "Oscar News" 211
Sept 2015)."
<https://www.qsl.net/zs6bte/LNB%20Test%20Results.htm>
<http://www.dg0opk.darc.de/Octagon_LNB_mod_March2017.html>

73, Doug Reed, N0NAS.