[time-nuts] Lucent RFTG-m-XO
Robert E. Martinson
REMartinson at rcn.com
Fri Feb 2 10:53:58 EST 2007
Would appreciate additional info please.
I'm trying a 24 hour run now with the XO unit just in case I never let it
run long enough previously. Also it's all buttoned-up just in case some
external RF source was disturbing it previously. The only connections are
24 VDC & the antenna.
The Fault & No GPS lamps are on & there is NO 15 MHz present on the front
panel SMA connector. With a scope I see no activity on J5.
Interestingly, the 5 VDC for the antenna comes from the daughter board, NOT
the GPS receiver. This verified by measuring 5 VDC on the TNC connector
with the GPS receiver unplugged. I guess this allows them to sense an
antenna fault. I tried various dummy loads (resistors) to simulate from
about 10-80 ma antenna loads. The fault lamp never extinguished.
Maybe I really have a faulty XO unit??
Are the RS-485 connections on J5 2-wire or 4-wire?? Has anybody managed to
make any sense of the data &/or commands??
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Phil Staton
Sent: Thursday, February 01, 2007 6:53 PM
To: time-nuts at febo.com
Subject: [time-nuts] Lucent RFTG-m-XO
Leave it running for at least 24hrs.
The 15MHz will slowly get on freq.
Countup is available on 1pps socket.
more when I have time
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