[time-nuts] HP 117/10509a

[paul]

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-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
> Behalf Of paul
> Sent: Thursday, July 05, 2012 7:49 AM
> To: time-nuts at 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" <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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