John The 3801s are getting very old at this point. I know mine has started to show a loss of lock occasionally on the oscillator. Intermittent problems are very tough. What jumps out to me is the 27 volts. That seems low as I recall. I run at 48 V. I understand there were several models made so what I mention may not be correct. The other thing is there is a small regulator on the power board. I know on my unit one of the regulated outputs on the switcher failed and I simply replaced it with another small block switcher. Though as you mention your voltages appears fine. Regards Paul WB8TSL
On Mon, Jan 25, 2016 at 8:54 PM, John Green <[email protected]> wrote: > After running continuously for about 3 years at work, I stored my Z3801 for > a little over a year. I recently took it out of storage and when I hooked > it up, all I get is a power on light. The front panel LEDs light in > sequence and the 6 inside blink red once and then the last one blinks > continuously as always. Thing is, it never locks on GPS. I even left it on > over night. When run on 27 volts, it starts out at about 1.1 amps, then > after about 10 minutes, goes up to 1.26 amps. Then, after about 30 more > minutes, it settles down to .88 amps and stays there. The OCXO gets warm. I > haven't checked for 10 MHz out, but I am pretty sure it is there. I hooked > it up to my netbook but I get no response from it at all. I am using one of > those USB to serial devices and it used to work. I am looking for a PC with > a real serial port to try. I know the antenna is good. It works with one of > those Symmetricom GPSDO cards. Having heard about the evils of tantalum > capacitors for years, I replaced them all except for those on the GPS > receiver board itself. All the test points that call out a voltage read > correctly. I'm thinking of trying a new GPS board next. I have had this > thing a long time and it has always just worked. Any ideas what the problem > is? > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
