Not sure why the email did not send
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.
Regards
Paul
On 7/5/2012 10:58 AM, Ron Ward wrote:
Hi:
What is the new bandwidth for BPSK WWVB going to be?
Why are they going to BPSK, cheaper clocks?
How am I going to compare GPS to something to see if GPS is accurate?
What about 400.1 MHz GEOS?
Thanks,
Ron
-----Original Message-----
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of paul
Sent: Thursday, July 05, 2012 7:49 AM
To: time-nuts@febo.com
Subject: Re: [time-nuts] HP 117/10509a
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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