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

[Bob Camp]

Hi

Simple answer - they are still playing around with the signal format. It is totally unclear what the final format will really look like. Until they make up their minds there is only one safe bet - the clock on grandma's wall will still handle the wwvb format they use. Anything more complex than that is very much in the "who knows" category.

Bob

On Jul 5, 2012, at 1:07 PM, Edgardo Molina wrote:

> 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
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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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