Can anyone tell me what the group of four LEDs in one corner of the
E1938 board indicate? There is no indication of function on the schematic.
Thanks for any enlightenment!
Dan
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I have attached a LH screen shot which includes a two hour long holdover
of the 3801A in question. Needless to say none of the six other GPSDOs
connected to the same antenna / distribution amp were affected. It is
certainly not an oven failure.
I'll be waiting for Synergy...
Dan
ac6ao
My faithful 3801, some 207 thousand hours old, has developed an
occasional fault that I think must be down to the Motorola Oncore 6
channel board and I wonder if there is an available unit that could
replace this, or what the recommended substitute is? eBay searches
don't show any of the
On 12/26/2021 6:05 PM, Bob Albert via time-nuts wrote:
Link doesn't work.
https://worldradiohistory.com/BOOKSHELF-ARH/Tube-Technology/Handbook-of-Piezoelectric-Crystals-John-P-Buchanan-1956-(701-pages).pdf
worked for me, all 700 odd pages of it. Thanks Nigel, and Happy Hogmanay,
Dan
On 11/30/2021 7:19 AM, Bob kb8tq wrote:
Hi
Quick and dirty way to check the oven is to monitor current. It should start out
near the max rated power and drop back after a few minutes.
And it's worth checking the thermal fuse, which I've had fail in a lot
of them.
Dan
On 11/24/2021 1:06 PM, Gerhard Hoffmann wrote:
Hi,
it took some time to make the Gerbers,
It is much appreciated Gerhard, all the work you have done to make these
available to the group. Many thanks!
Now, the inevitable query; is anyone planning on ordering some of these
boards, and is
Norman,
From the code 0 7 26, if there is just one faulty RAM IC you will see
down the bottom of the screen a RAM hex number from 0 to F. On page 6-59
in Volume 1 you will find a list of the IC numbers that correspond to
those RAM numbers. However since you seem to have an additional Error
On 11/12/2021 9:57 AM, Norman Reitz via time-nuts wrote:
Hi,
I hope someone here can help. I want to setup a HP 3048a phase noise
measurement Set. So I bought the HP 3561a an the interface. After testing the
HP3561a I hat two error Codes: #0 7-26 and #0 7-31. Does someone got the
Walter, at least in my FRK manual the External frequency Adjustment is
addressed on page 4-7. In brief you connect a 1k0 variable resistor
between pins 8 and 9 as you have the variety with those connections. I
have a pencilled note saying that you may need to add some components
On 9/1/2020 10:24 PM, Manfred Bartz wrote:
Hi all,
I bought 2 x 10811 OCXOs for a 10MHz GPSDO project I am working on.
The OCXOs came with an interface board HP 05328-20027, see attached
Manfred, the -hp- system of numbering would indicate that this was from
a 5328 counter. There are two
On 2/3/2020 12:58 PM, gandalfg8--- via time-nuts wrote:
I'm not in anyway trying to detract from the 8663, or from its performance, but
until someone is brave enough to attack one with a hacksaw and prove otherwise,
I still have the one that, until the EFC circuit in it became flaky,
Thanks to all who offered advice. I have attached a LH screen shot
showing last night's event. From my limited understanding it looks like
the receiver part is working fine... The EFC had started to dive
however, more than two hours before it went into holdover.
I'd appreciate comments
On 6/20/2019 12:41 PM, paul swed wrote:
Dan,
I think that sounds like the rcvr going. Search the time-nuts archives.
That may help you. If thats the case there were also comments on
alternate receivers though all of those are old and hard to come by.
Thanks Paul, The concensus seems to favor
I have an elderly 3801A with some 182,000 hours on the clock, which if
my arithmetic is correct means over twenty years of operation. Since it
has a well aged and remarkably stable OCXO I would like to keep it going
if possible. Recently it has been going into Holdover and staying there
for
On 4/25/2019 1:13 PM, Bob kb8tq wrote:
Pretty much all of these OCXO???s (regardless of seller) come out of a pretty
brutal
scrap process. It is ???normal??? to get more bad then good when you buy a
group of
them.
Absolutely agree with that when it somes to those out of China, but the
"UTC
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