On 15/07/11 15:06, Ron Hahn (EI2JP) wrote:
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
Somehow I am not surpriced, as similar problems have been showing up at
my place. Fixing some cable and connector problems removed the issues.
Hope it stays stable now and you get good lockup.
Cheers,
Magnus
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