[time-nuts] HP Z3801 won't lock onto satellites

[Robert Nickels]

I apologize for a question that's probably been asked a zillion times 
before but the Z3801 that I've had for years (but not in service) won't 
lock on to satellites anymore and I'm looking for any suggestions as to 
how to troubleshoot it.

I know the antenna works as I also have a Leo Bodnar GPSDO that it works 
fine on and when connected to the Z3801 there is voltage across the 
antenna. It seems to power up OK but just sits with the Holdover LED 
lit,  which I assume means it's not hearing any satellites.

Some time ago the 5V power supply module failed, and I wired in a 
different one, which is putting out 5.0 volts so that's not the problem.

My understanding is the unit should lock on to satellites and work 
without any serial commands.   I converted the port from RS-422 to 
regular serial but the old PC with a real serial port I used to use is 
long gone - so I'd appreciate knowing if there is a reason to try to 
restore the serial connection, and if so what software to use.    It's 
probably wishful thinking to hope for any kind of diagnostic software - 
but maybe?

Thanks for any ideas as to how to identify the problem,

73, Bob W9RAN