[time-nuts] 60kHz Loop antenna

Sun Oct 3 15:28:42 UTC 2010

Since WWVB is a phase tracking system, I'm not convnced a high-Q loop is
such a good idea. HP's loop for the 117A is not tuned, as I rember, but it
is followed with a narrow band amp.

FWIW

-John

===========

> Thanks Dick, Ok with interference that close it would help. Shielding
> doesnt
> always provide much at these frequencies and can reduce the Q of the loop.
>
> Best Wishes
> Alan G3NYK
>
> ----- Original Message -----
> From: "Dick Moore" <richiem at hughes.net>
> To: <time-nuts at febo.com>
> Sent: Sunday, October 03, 2010 6:56 AM
> Subject: Re: [time-nuts] 60kHz Loop antenna
>
>
>> Alan, I did try a real half-a$$ed pile of wire and a tuning cap. My shop
> has fluorescent lights and I got a lot of noise. Once I built the shielded
> loop and got it lined up with east and a little south (I'm in Washington
> State), WWVB came in gang-busters. This was before I built a GPSDO or two
> and then got a TBolt.
>>
>> The shielded loop has just been sitting for years.
>>
>> Dick
>>
>>
>> On Oct 2, 2010, at 3:42 PM, time-nuts-request at febo.com wrote:
>> >
>> > Message: 5
>> > Date: Sat, 2 Oct 2010 23:40:52 +0100
>> > From: "Alan Melia" <alan.melia at btinternet.com>
>> > Subject: Re: [time-nuts] HP/Dymek DY-5842
>> > To: "Discussion of precise time and frequency measurement"
>> > <time-nuts at febo.com>
>> > Message-ID: <015501cb6283$10071ad0$4001a8c0 at lark>
>> > Content-Type: text/plain; charset="iso-8859-1"
>> >
>> > Dick did you ever try an unscreened loop ?? they should be just as
>> good
> if
>> > not better at 60kHz.
>> > Alan G3NYK
>> >
>> > ----- Original Message -----
>> > From: "Dick Moore" <richiem at hughes.net>
>> > To: <time-nuts at febo.com>
>> > Sent: Saturday, October 02, 2010 11:22 PM
>> > Subject: Re: [time-nuts] HP/Dymek DY-5842
>> >
>> >
>> >> I used to have one of these marvelous receivers and sold it. I still
> have
>> > the WWVB/60kHz shielded loop antenna that I made for it and although
>> it
> is
>> > big, at about 30" x 30" x 2" or so, I believe it will ship FedEx or
>> UPS
> OK.
>> > It's free to anyone who'll pay the shipping. It's made out of copper
> pipe
>> > and works quite well, and is tuned for the 5842 at 60kHz.
>> >>
>> >> Best,
>> >> Dick Moore
>> >>
>> >>
>> >> On Oct 1, 2010, at 3:50 PM, time-nuts-request at febo.com wrote:
>> >>
>> >>
>> >>> Message: 5
>> >>> Date: Fri, 01 Oct 2010 16:34:57 -0600
>> >>> From: ziggy9 <ziggy9 at pumpkinbrook.com>
>> >>> Subject: [time-nuts] Possibly OT - Any interest in a vintage
>> HP/Dymec
>> >>> DY-5842 VLF receiver?
>> >>> To: <time-nuts at febo.com>
>> >>> Message-ID: <990bd60b3c5d084910c10c8855912ddf at pumpkinbrook.com>
>> >>> Content-Type: text/plain; charset=UTF-8
>> >>>
>> >>>
>> >>> Fellow time-nuts:
>> >>> I've got a circa 1964 DY-5842 VLF receiver. This is (was) operated
>> in
>> >>> conjunction with an external time interval counter to make a
>> frequency
>> >>> comparison. So you would select WWVL for example, and use that as
>> your
>> >>> primary standard for comparison to your local standard. It's got 5
>> > crystals
>> >>> in it: 16, 18, 19.8, 20, and 60 kHz (listed as GBR, NBA, NPM, WWVL,
>> > WWVB).
>> >>> It works and I have the manual. The thing is, the interest in
> something
>> >>> like this is bound to be a bit narrow, so I thought I'd mention it
> here.
>> >>>
>> >>> So if there are any collectors, equipment museums, etc. that might
>> be
>> >>> interested in this, please let me know. I'm a bit sentimental about
> this
>> >>> thing, it's sort of a bit of history, and from what I can tell,
> somewhat
>> >>> rare (doesnt make it worth anything though :). Since it's a bit of a
>> >>> curiosity, I'd like to pass it to someone that might be interested
>> in
> it
>> >>> rather than just tossing it. I can always provide more details to
> anyone
>> >>> that wants them.
>> >>>
>> >>> Best regards,
>> >>> Paul Davis - K9MR
>> >>>
>> >>>
>> >>>
>> >>>
>> >>> ------------------------------
>> >>>
>> >>> Message: 6
>> >>> Date: Fri, 1 Oct 2010 18:42:16 -0400
>> >>> From: "jmfranke" <jmfranke at cox.net>
>> >>> Subject: Re: [time-nuts] Possibly OT - Any interest in a vintage
>> >>> HP/Dymec DY-5842 VLF receiver?
>> >>> To: "Discussion of precise time and frequency measurement"
>> >>> <time-nuts at febo.com>
>> >>> Message-ID: <B7EA2D4AB6F34AB19DA25CFDC85A666A at Franke>
>> >>> Content-Type: text/plain; format=flowed; charset="iso-8859-1";
>> >>> reply-type=original
>> >>>
>> >>> I am very interested.  Do you have any images?
>> >>>
>> >>> John  Franke WA4WDL
>> >>> Portsmouth, VA 23703
>> >>>
>> >>> --------------------------------------------------
>> >>> From: "ziggy9" <ziggy9 at pumpkinbrook.com>
>> >>> Sent: Friday, October 01, 2010 6:34 PM
>> >>> To: <time-nuts at febo.com>
>> >>> Subject: [time-nuts] Possibly OT - Any interest in a vintage
>> HP/Dymec
>> >>> DY-5842 VLF receiver?
>> >>>
>> >>>>
>> >>>> Fellow time-nuts:
>> >>>> I've got a circa 1964 DY-5842 VLF receiver. This is (was) operated
>> in
>> >>>> conjunction with an external time interval counter to make a
> frequency
>> >>>> comparison. So you would select WWVL for example, and use that as
> your
>> >>>> primary standard for comparison to your local standard. It's got 5
>> >>>> crystals
>> >>>> in it: 16, 18, 19.8, 20, and 60 kHz (listed as GBR, NBA, NPM, WWVL,
>> > WWVB).
>> >>>> It works and I have the manual. The thing is, the interest in
> something
>> >>>> like this is bound to be a bit narrow, so I thought I'd mention it
>> > here.
>> >>>>
>> >>>> So if there are any collectors, equipment museums, etc. that might
>> be
>> >>>> interested in this, please let me know. I'm a bit sentimental about
>> > this
>> >>>> thing, it's sort of a bit of history, and from what I can tell,
>> > somewhat
>> >>>> rare (doesnt make it worth anything though :). Since it's a bit of
>> a
>> >>>> curiosity, I'd like to pass it to someone that might be interested
>> in
>> > it
>> >>>> rather than just tossing it. I can always provide more details to
>> > anyone
>> >>>> that wants them.
>> >>>>
>> >>>> Best regards,
>> >>>> Paul Davis - K9MR
>> >>>>
>> >>>>
>> >>>> _______________________________________________
>> >>>> time-nuts mailing list -- time-nuts at febo.com
>> >>>> To unsubscribe, go to
>> >>>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>> >>>> and follow the instructions there.
>> >>>>
>> >>>
>> >>>
>> >>>
>> >>>
>> >>> ------------------------------
>> >>>
>> >>> Message: 7
>> >>> Date: Fri, 01 Oct 2010 17:50:17 -0500
>> >>> From: Brian Kirby <kilodelta4foxmike at gmail.com>
>> >>> Subject: Re: [time-nuts] Possibly OT - Any interest in a vintage
>> >>> HP/Dymec DY-5842 VLF receiver?
>> >>> To: Discussion of precise time and frequency measurement
>> >>> <time-nuts at febo.com>
>> >>> Message-ID: <4CA665A9.1090908 at gmail.com>
>> >>> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>> >>>
>> >>> You might consider contacting Dr. Ken Kuhn  --
>> kennathakuhn at gmail.com
>> >>>
>> >>> check his HP museum at http://www.kennethkuhn.com/hpmuseum/
>> >>>
>> >>> Brian Kirby KD4FM
>> >>>
>> >>>
>> >>>
>> >>> On 10/1/2010 5:34 PM, ziggy9 wrote:
>> >>>>
>> >>>> Fellow time-nuts:
>> >>>> I've got a circa 1964 DY-5842 VLF receiver. This is (was) operated
>> in
>> >>>> conjunction with an external time interval counter to make a
> frequency
>> >>>> comparison. So you would select WWVL for example, and use that as
> your
>> >>>> primary standard for comparison to your local standard. It's got 5
>> > crystals
>> >>>> in it: 16, 18, 19.8, 20, and 60 kHz (listed as GBR, NBA, NPM, WWVL,
>> > WWVB).
>> >>>> It works and I have the manual. The thing is, the interest in
> something
>> >>>> like this is bound to be a bit narrow, so I thought I'd mention it
>> > here.
>> >>>>
>> >>>> So if there are any collectors, equipment museums, etc. that might
>> be
>> >>>> interested in this, please let me know. I'm a bit sentimental about
>> > this
>> >>>> thing, it's sort of a bit of history, and from what I can tell,
>> > somewhat
>> >>>> rare (doesnt make it worth anything though :). Since it's a bit of
>> a
>> >>>> curiosity, I'd like to pass it to someone that might be interested
>> in
>> > it
>> >>>> rather than just tossing it. I can always provide more details to
>> > anyone
>> >>>> that wants them.
>> >>>>
>> >>>> Best regards,
>> >>>> Paul Davis - K9MR
>> >>>>
>> >>>>
>> >>>> _______________________________________________
>> >>>> time-nuts mailing list -- time-nuts at febo.com
>> >>>> To unsubscribe, go to
>> > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>> >>>> and follow the instructions there.
>> >>>>
>> >>>
>> >>
>> >>
>> >> _______________________________________________
>> >> time-nuts mailing list -- time-nuts at febo.com
>> >> To unsubscribe, go to
>> > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>> >> and follow the instructions there.
>> >
>> >
>> >
>> >
>> > ------------------------------
>> >
>> > _______________________________________________
>> > time-nuts mailing list
>> > time-nuts at febo.com
>> > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>> >
>> > End of time-nuts Digest, Vol 75, Issue 4
>> > ****************************************
>>
>>
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