[time-nuts] Z3801A and Z38XX Issues

And remember that commands sent to the Z3801A end in Line Feed, not Carriage Return. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.

[time-nuts] Resoration of 5065A - continued...

Continuing my efforts to fix the 5065A... There was something wrong in the A7 (AC Amplifier assembly). DC balance of the input stage was completely off-scale and one of the 1854-0023 transistors had an open junction.Luckily I had a small supply of them but I also discovered that the OP-Amps

Re: [time-nuts] Resoration of 5065A - continued...

I would simply slap a 741 into position to see how it behaves. Also check those zeners for +/- 14.7V. They go bad. Regards Paul WB8TSL On Mon, Sep 11, 2017 at 5:56 AM, Ulf Kylenfall via time-nuts < time-nuts@febo.com> wrote: > > Continuing my efforts to fix the 5065A... > > There was something

Re: [time-nuts] Restoration of 5065A - continued...

So curious did that get the unit running?? Regards Paul WB8TSL On Mon, Sep 11, 2017 at 2:22 PM, Ulf Kylenfall via time-nuts < time-nuts@febo.com> wrote: > > When I mentioned redesign, it was the intention to copy the by HP updated > designinto a new Cad project (I use Cadence PCB Editor for

Re: [time-nuts] Resoration of 5065A - continued...

On Mon, Sep 11, 2017 at 9:36 AM, paul swed wrote: > I would simply slap a 741 into position to see how it behaves. > Also check those zeners for +/- 14.7V. They go bad. > Regards > Paul > WB8TSL > > ... but leave the pins that the 709 uses for external frequency compensation

Re: [time-nuts] Resoration of 5065A - continued...

Hi It’s been a *long* time since the 709 or 741 were “best” in any regard. I would not go with socketed parts. I’ve seen more problems from sockets than from the parts that go into them. Semiconductor quality / reliability has come a *long* way since the 1960’s. How to redesign the board

[time-nuts] Z3801A

Fellow time-nuts, Does anyone has the schematic of the PSU-board in the Z3801A? Me and a fellow ham need it. Cheers & 73, Magnus SA0MAD ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

[time-nuts] Resoration of 5065A - continued/old style A7

Ulf, You either should replace the -6010 old style A7 or if building one from scratch build the late style. The new style has a BP filter on the 2nd harmonic that makes the 2nd harmonic reading a better indication. On the old style as you adjust the CF (in open loop) you will see the 2nd harmonic

[time-nuts] Restoration of 5065A - continued...

When I mentioned redesign, it was the intention to copy the by HP updated designinto a new Cad project (I use Cadence PCB Editor for which I have a license)and then accomodate for more modern versions of the operationalamplifiers since I guess that there are not that many "A7" modulesaround

Re: [time-nuts] Z3801A and Z38XX Issues

I seem to remember its 19200, 7,O,1. Regards Paul WB8TSL On Sun, Sep 10, 2017 at 11:01 PM, Mark Sims wrote: > And remember that commands sent to the Z3801A end in Line Feed, not > Carriage Return. > ___ > time-nuts mailing list --

Re: [time-nuts] Z3801A

Hi Dave, This is what I was looking for but could not locate. Thanks! This is what I like with this community, we help each other out! Cheers, Magnus On 09/11/2017 07:49 PM, Artek Manuals wrote: Magnus This is available for free download somewhere...not our scan .. reverse engineered

Re: [time-nuts] Z3801A

I  didn't look but I think that is up on KO4BB's site. Dave manu...@artekmanuals.com On 9/11/2017 5:31 PM, Magnus Danielson wrote: Hi Dave, This is what I was looking for but could not locate. Thanks! This is what I like with this community, we help each other out! Cheers, Magnus On

[time-nuts] HP-531xx calibrator nearing completion

I connected a prototype of the HP-531xx calibrator signal circuits (input squarer, freq doubler, divider, output buffer, level shifter) to a TAPR TICC to see how stable the output was. This prototype was built on perf board using DIP packaged 74AC logic so I was not expecting good results.

Re: [time-nuts] Restoration of 5065A - continued...

Hi Well if people are looking for those willing to “adopt” a stray 5065A or two, I’ll certainly toss my name onto that list !! :) Back in the era HP did these designs, things like surface mount were still a bit new. They had some very legitimate questions about packaging and published a few