On 7/11/2011 3:57 PM, Charles P. Steinmetz wrote:
Ron wrote:
Colleagues,
My Z3801 has developed a peculiar problem over the last few weeks.
The problem is that it seems to oscillate between "gps-lock" and
"holdover". When I checked further it seems to be oscillating
between, locked, recovery, and holdover, mostly staying in recovery
and holdover.
Have you tried substituting another antenna and cable (even just a
short cable with the antenna indoors)? This looks like what I'd
expect a 3801 to do if its antenna or antenna connection were
intermittent. While you have it disconnected, check that the 3801 is
putting antenna power on the coax.
Hi Charles,
I disconnected the mushroom-style antenna and measured the voltage
between the TNC centre pin and shield; This was 5 volts. Connection
looked clean and unaffected by weather or moisture ingress. Reattached
the connector and screwed it on until it was tight, then rechecked
gpscon. Satellites are now being received.
So I can only deduce from this that the TNC male (cable end) to TNC
female (mushroom antenna) is intermittent. Don't understand why but it
now looks like it is receiving 6 satellites and the 3801 is in
"recovery" mode.
http://www.ei2jp.org/gpscon/gpsstat.htm
R
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