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 <merchi...@yahoo.co.uk>
To: time-nuts@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.
b...@att.net
www.biwa.cc
K6OQK
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