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" <n6idl...@comcast.net>
To: "'Discussion of precise time and frequency measurement'"
<time-nuts@febo.com>
Subject: Re: [time-nuts] HP 117/10509a
Message-ID: <A12C52D31F1E4BFB96841D691B4E86DE@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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