Boy do I agree with Dave's comments. Even if the big block inverter is bad
it can all be replaced. I have a small inverting supply in my unit to
replace one leg. I think it was the -5V supply. Its been running for 7 plus
years.
Good luck
Regards
Paul
WB8TSL
On Mon, May 23, 2016 at 6:54 PM, Dave M
On 5/23/2016 3:54 PM, Dave M wrote:
Dan,
If you haven't already found the Z3801A page at
http://www.realhamradio.com/GPS_Frequency_Standard.htm, you should
read it thoroughly (in your case, especialy the section on the power
supply). there is a good pictorial that shows locations of all the
Dan,
If you haven't already found the Z3801A page at
http://www.realhamradio.com/GPS_Frequency_Standard.htm, you should read it
thoroughly (in your case, especialy the section on the power supply). there
is a good pictorial that shows locations of all the power supply test
points. Using that
My Z3801 power supply board has given up the ghost. It had been working
well apart from an occasional Error 230 causing it to go into Holdover
for no good reason from time to time which may well be related of course.
Does anyone have a good power supply from an otherwise dead unit which
Thanks, Warren. That's a very nice solution! I have a unit on the way from
another time-nut, so I should be set.
I'm pretty sure the problem with the old unit is just aging as I watched the
EFC creep for months toward the limit. I bought two units at the same time
(long, long ago) and
You may have seen this before, but there is a nice writeup on how to
disassemble the whole thing, with pictures and all.
http://www.realhamradio.com/GPS-oven-journey.htm
I had to take mine apart quite a few years ago to replace the opamp in
the inner oven temperature regulator circuit. If
John
If it is off very far the first thing I'd suspect is the inner oven.
Assuming the freq is still stable and low noise, one option is to rewire it,
and make the freq adjustment accessible.
Removing the original inner wiring wrap also provides many other advantages,
and no down side
John,
Like you I have a bad oscillator and I also pulled the thing apart to find
"The goo"
Nasty stuff. Also re-wrapping the outer oven wire would be a big pain.
Since that 3801 had further issues I set it aside.
Regards
Paul
WB8TSL
On Thu, Feb 4, 2016 at 1:20 PM, John Ackermann N8UR
I have a Z3801A whose oscillator has aged out of correction range, and
thus throws an EFC alarm.
Anyone have a still-in-range double-oven HP10811 from a unit that died
for another reason? If so, I'd be happy to acquire it.
(I tried disassembling one of the double-oven 10811s years ago and
...3805... better receiver...
Bear in mind, there are several versions out there with very different
receivers and oscillators. I've got one with an 8-channel- and one with
a 16-channel receiver.
Volker
Am 14.02.2013 22:12, schrieb Rex:
Here is a Z3816a -- 271152849045
I don't know the
Hello
I am looking for a working Z3801 for a shop bench reference.
Located in Minneapolis.
I see that there is essentially nothing on eBay.
Considering T-Bolt or Z3805 also.
Greg
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output. Obviously they aren't quite as useful.
Bob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Greg Broburg
Sent: Thursday, February 14, 2013 9:14 AM
To: time-nuts@febo.com
Subject: Re: [time-nuts] Looking for Z3801
Hello
I am
Broburg
Sent: Thursday, February 14, 2013 9:14 AM
To: time-nuts@febo.com
Subject: Re: [time-nuts] Looking for Z3801
Hello
I am looking for a working Z3801 for a shop bench reference.
Located in Minneapolis.
I see that there is essentially nothing on eBay.
Considering T-Bolt or Z3805 also
:52 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Looking for Z3801
Perhaps consider eBay item # 270970034317 ?
JimT
On Thu, Feb 14, 2013 at 8:36 AM, Bob Camp li...@rtty.us wrote:
Hi
For a bench reference, the TBolt, the 3801, the 3805, and the 381x's
Here is a Z3816a -- 271152849045
I don't know the seller but has lots of sales.
3816 requires no serial configuration (like 3801) and has two 10 MHz out
standard. Several years back I came up with a mod to convert the 4
19...MHz outputs to additional 10 MHz square outputs. --
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