[time-nuts] HP 117/10509a

[paul]

As John has mentioned all of the old receivers are dead! They will not 
lock to the new BPSK signal.
Though John and I have been working to see what can be done I have to 
say to date lots of methods have been tried and none really all that 
successful. These methods include phase lock, squaring/doubling and 
dividing. The normal types of things used to de-bpsk a signal. Or as I 
call the system the "d-psk-r". I can see how these methods in general 
work. But the noise hits on the east coast are pretty troubling in 
causing phase flips. Essentially you need a way to force the the system 
into one side of the phase always at 120 Khz.

So here is the approach I would take. The RF stage you are speaking 
about has 3 nuvistors and those would easily be replaced by 2 op amps 
with about 10 db of gain to spare. Simply build 60 KC tuned tanks 
between stages and you would be in business. I have no idea but the 
existing L+Cs might be useful here. Then when done you would have a 
fantastic wwvb signal strength meter and thats all.
Its funny on the nuvistors I thought they would be an issue also. But I 
have been getting them for 2-3 dollars each and they do not really die 
all that often.

On 7/5/2012 8:42 AM, Gordon Batey wrote:
> Ron,
>
> I would certainly be interested in any conversion scheme that you come up
> with.  I have 2 117's and hope to get them operational sooner rather than
> later.  -:)
>
> Gordon WA4FJC
>
> ============================================
>
> Date: Thu, 5 Jul 2012 00:14:32 -0700
> From: "Ron Ward" <n6idlron at comcast.net>
> To: "'Discussion of precise time and frequency measurement'"
> 	<time-nuts at febo.com>
> Subject: Re: [time-nuts] HP 117/10509a
> Message-ID: <A12C52D31F1E4BFB96841D691B4E86DE at RonPC>
> Content-Type: text/plain;	charset="us-ascii"
>
> Thanks Charles:
> I will consider your ideas as they seem to be excellent!
>
> I wonder if I could just make the whole unit run off of +24VDC or +12
> VDC.
> I need to look at the schematics and see what would be the best way to
> proceed.
>
> I currently do not have an antenna for WWVB and need to get up and
> running before I do anything with it.
>
> If successful, would anyone want information on my conversion? I also
> have a fluke 207 that needs to be recapped.
> Thanks,
> Ron
>
>
>
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