[time-nuts] time-nuts Digest, Vol 161, Issue 38

Eric Haskell eric_haskell at hotmail.com
Tue Dec 26 19:34:36 EST 2017


I have seen people selling Russian Military SRD's on eBay before.  I have not checked lately.  Search SRD or step recovery diode.


Norman Eric Haskell

KC4YOE

Keller, TX USA


________________________________
From: time-nuts <time-nuts-bounces at febo.com> on behalf of time-nuts-request at febo.com <time-nuts-request at febo.com>
Sent: Tuesday, December 26, 2017 11:00 AM
To: time-nuts at febo.com
Subject: time-nuts Digest, Vol 161, Issue 38

Send time-nuts mailing list submissions to
        time-nuts at febo.com

To subscribe or unsubscribe via the World Wide Web, visit
        https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
time-nuts Info Page - American Febo Enterprises<https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts>
www.febo.com
time-nuts is a low volume, high SNR list for the discussion of precise time and frequency measurement and related topics. To see the collection of prior postings to ...


or, via email, send a message with subject or body 'help' to
        time-nuts-request at febo.com

You can reach the person managing the list at
        time-nuts-owner at febo.com

When replying, please edit your Subject line so it is more specific
than "Re: Contents of time-nuts digest..."


Today's Topics:

   1. question about HP 5601a harmonic generator (cdelect at juno.com)
   2. Re: question about HP 5601a harmonic generator (Morris Odell)


----------------------------------------------------------------------

Message: 1
Date: Mon, 25 Dec 2017 10:53:24 -0800
From: <cdelect at juno.com>
To: time-nuts at febo.com
Subject: [time-nuts] question about HP 5601a harmonic generator
Message-ID: <AABPECUL4AFTP5PA at smtpout03.dca.untd.com>
Content-Type: text/plain; charset=us-ascii

When working on the A4 assy. the ONLY adjustments you should make are:

- Cavity frequency, unscrew locking ring and while looking at the A7 J1
signal or 2nd harmonic reading adjust for max and then lock down.

- Attenuator, Unlock with allen, adjust for same, usually pulled all the
way out. Remember to lock.

-S5 the one by the attenuator, only needed if tube swapped but if you
adjust make sure the peak does not slip when you tighten the locknut.

- the top pot, adjust for the same.

- If you adjust any of the other locknutted plungers you will NEVER get
back to where you need to be!!!!

Cheers,


Corby



------------------------------

Message: 2
Date: Tue, 26 Dec 2017 11:14:20 +1100
From: "Morris Odell" <vilgotch at bigpond.net.au>
To: <time-nuts at febo.com>
Subject: Re: [time-nuts] question about HP 5601a harmonic generator
Message-ID: <000301d37dde$7a2604c0$6e720e40$@bigpond.net.au>
Content-Type: text/plain;       charset="utf-8"

Hi,

Fortunately I have not had this problem but I did have to deal with a destroyed SRD in a HP 5110A  synthesizer driver a few years ago. The SRD in that device is maintained at an elevated temperature in a little oven and as a result of a thermostat failure it was reduced to a charred blob. With no possibility of finding an original  replacement I set the harmonic generator module up on the bench ( no easy feat!) and tried a range of different diodes to see if any of them would work. After a lot of experimentation I finally hit on a power varactor diode that was the final frequency multiplier in a junked cellphone transmitter from the original analog FM system that was eventually replaced with the current digital one. That diode was made by National Panasonic and is a gold plated stud mounted device. I had to fiddle around to fit it in but the 5110A has not missed a beat since. Of course, in the 5110A it does operate at a much lower frequency than the 5061A, but it's original use was i
 n the upper VHF range I think.

If you can't find a replacement you might have to resort to similar experimentation .

Morris



> May I know if anyone knows the part number or the specification of the
> step recovery diode in the harmonic generator for the old HP 5601A
> cesium frequency standard?
>


---
This email has been checked for viruses by AVG.
http://www.avg.com
AVG 2017 | FREE Antivirus & TuneUp for PC, Mac, Android<http://www.avg.com/>
www.avg.com
Download FREE antivirus and malware protection. Tune up your PC, Mac and Android devices for peak performance. Surf safely and privately, wherever you are.





------------------------------

Subject: Digest Footer

_______________________________________________
time-nuts mailing list
time-nuts at febo.com
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
time-nuts Info Page - American Febo Enterprises<https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts>
www.febo.com
time-nuts is a low volume, high SNR list for the discussion of precise time and frequency measurement and related topics. To see the collection of prior postings to ...



------------------------------

End of time-nuts Digest, Vol 161, Issue 38
******************************************


More information about the time-nuts mailing list