[time-nuts] schematics for a HP117a please
max at maxsmusicplace.com
Sun May 2 19:27:41 UTC 2010
Has the 13CW4s for the loop antenna and 6CW4/6DS4s for the receiver.
Max. K 4 O D S.
Email: max at maxsmusicplace.com
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----- Original Message -----
From: "paul swed" <paulswedb at gmail.com>
To: <jfor at quik.com>; "Discussion of precise time and frequency measurement"
<time-nuts at febo.com>
Sent: Sunday, May 02, 2010 12:17 PM
Subject: Re: [time-nuts] schematics for a HP117a please
> Thanks everyone.
> Indeed the nuvistors will be a challenge.
> Don't know if between the 2 recvrs I have enough or if they are good or
> But if need be a bit o redesign may be in order.
> I am currently using a fair size copper tune loop/preamp on a tracor 599H.
> So thats a good start. But I will dig in and see whats cooking (Or not)
> Noticed one has the creeping ground lug oxidation. Time for a drill.
> On Sat, May 1, 2010 at 1:02 PM, J. Forster <jfor at quik.com> wrote:
>> Have you tried Dave at Artek Media?
>> A couple of things on the 117A:
>> The antenna is a roughly 1 meter diameter loop, but has a very frequency
>> selective pre-amp built in. Early versions used two Nuvistors and a 60
>> mechanical filter. Later versions used FETs I think. The amp in the unit
>> also uses three Nuvistors. These devices are getting scarce and
>> The coax between thr receiver and antenna has DC on it to power the loop
>> The paper for the stripchart is getting hard to find also.
>> > Just picked up 2 units at a flea market today.
>> > Would like to fire them up without smoke. :-)
>> > Would appreciate schematics if the are out there.
>> > My search so far is 0
>> > Thanks
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