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

[Edgardo Molina]

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

Piensa en Bits SA de CV



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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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