[time-nuts] HP 117/10509a...

[Ron Ward]

Hi:
This is so frustrating!

Who makes cheap clocks? CHINA.

Who uses phase comparison? DOD, American Colleges and Universities,
Laboratories, Astronomers, American Private Industry, Time Nuts, ETC.

What is our government doing? They appear to be the best friend Chinese
manufacturers ever had!

Ron

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of J. Forster
Sent: Thursday, July 05, 2012 10:29 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] HP 117/10509a...

The only ones that will work are very recent designs.

The HP 117 and Fluke 207 will not work.
Many Spectracoms will not work. A few will. See their web site
The Stanford 620 will not, I believe. Some models may.

I posted a partial list some time ago.

Apparently, NIST is working on a receiver and possibly a retrofit. When
it
will be available and how much it will cost is TBD.

I suspect the 'retrofit' will be the receiver with a 60 kHz output
added,
nothing more, but don't know.

Seems to me, we are down to one egg in one basket.  :((

-John

================



> Dear Group,
>
> This thread just saved me from a prospective purchase of an HP 117.
>
> Now the big question. Which instruments in general will be affected by
> the BPSK transition? I have been reading about Kinemetrics 60DC WWVB
> receiver and clock. It appeals to me if I find one. Will other WWVB
> instruments not designed specifically for phase comparisons be
> affected for the WWVB signal modulation changes? Which kind of
> instruments and interactions with WWVB should I avoid?
>
> Thank you. Your comments are surely welcome.
>
> Regards,
>
>
> Edgardo Molina
> Dirección IPTEL
>
> www.iptel.net.mx
>
> T : 55 55 55202444
> M : 04455 20501854
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> On Jul 5, 2012, at 11:32 AM, Merchison Burke wrote:
>
>> I thought about doing that but I did not want to spend a lot of time
>> experimenting fruitlessly.
>>
>> Thanks for the encouragement.
>>
>> Merchison
>>
>>
>> On 2012-07-05 11:19 AM, Burt I. Weiner wrote:
>>> Many years ago I had one of these antennas that I used with a
>>> Gertsch RLF-1 WWVB receiver.  When the Nuvistors became old and
>>> feeble I decided to change the 6CW4 Nuvistors to FETs.  Being young
>>> and foolish and thinking this is basically audio, I went to Radio
>>> Shack and got some N-Channel FETs and stuffed the FET's leads into
>>> the appropriate Nuvistor socket pins: Gate to Grid, Source to
>>> Cathode, and Drain to Plate.  As I recall, I had to add a wee bit
>>> of capacitance to make it tune back down to 60 KC - back then I
>>> didn't know from kHz.  I made a voltage divider inside the
>>> antenna's junction box to get the higher voltage down to what the
>>> FETs wanted.  It ran fine for the remaining 8 to10 years that I
>>> used the RLF-1's.  I forget where the antenna went, but it may
>>> still be in use somewhere.  At least I hope so.
>>>
>>> Burt, K6OQK
>>>
>>>> From: Merchison Burke <merchison at yahoo.co.uk>
>>>> To: time-nuts at febo.com
>>>> Subject: [time-nuts] HP 117/10509a
>>>>
>>>> Hello,
>>>>
>>>> Has anyone successfully replaces the Nuvistors in the 117 and the
>>>> 10509a
>>>> with FETs. I would like to replace them with inexpensive FETs
>>>> instead of
>>>> buying the expensive Nunistors.
>>>>
>>>> Thanks for all help,
>>>> Merchison
>>>
>>> Burt I. Weiner Associates
>>> Broadcast Technical Services
>>> Glendale, California  U.S.A.
>>> biwa at att.net
>>> www.biwa.cc
>>> K6OQK
>>>
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>>
>>
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