[TenTec] Some Observations on Orion Stability/Calibration
Paul Christensen, Esq.
w9ac at arrl.net
Wed Jun 4 11:00:30 EDT 2003
> Mine wasn't too far off -- about 15 Hz at 15 MHz. But that was more than
> that certain far eastern company shipped their equipment with. Clearly
> the latter company wasn't concerned only with meeting spec. I have two
> identical receivers from them and both were that good.
My RX-340 is currently about 10 Hz from zero beat at 15 MHz. Not bad since
I have never calibrated it. However, a simple pot adjustment will bring it
back to zero beat and will likely stay there without the effects of
vibration from shipping which likely affects calibration. Of course
on-going aging of a new TCXO will always be a factor. For a couple hundred
dollars, I figure it's worth having a GPS frequency standard that is
guaranteed to one part in one billion (that's 1 in 10^9).
After a bit of web research I found the following relevant articles relating
to the HP GPS receiver that may be of interest:
http://www.realhamradio.com/GPS_Frequency_Standard.htm
http://www.qsl.net/kt4qw/3801des.htm
http://www.ad6a.com/Z3801A.html
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