[time-nuts] Re: HP 10509A antenna specifications?

[Matt Krick]

If it is not too much trouble that would be great!

I'd like to see how well the unit works before making modifications to
strip the BPSK.

Since the format WWVB uses looks like it may give 900mS between phase
shifts and that may be enough to not be noticeable on the meter.

On Wed, Mar 1, 2023, 10:16 Gordon Batey via time-nuts <
time-nuts at lists.febo.com> wrote:

> Good Morning Matt,
>
> I have a couple of HP 117 units and one loop antenna with the nuvister
> preamp.  I could open it up and see if I can count the turns if
> necessary.
>
> I guess that you are aware that the unit will not work properly since the
> format of the signal was changed several years ago.
>
> Let me know if I can help.
>
> Gordon WA4FJC
>
>
> -----Original Message-----
> From: Matt Krick via time-nuts <time-nuts at lists.febo.com>
> Sent: Tuesday, February 28, 2023 3:41 PM
> To: Discussion of precise time and frequency measurement
> <time-nuts at lists.febo.com>
> Cc: Matt Krick <dcflux at gmail.com>
> Subject: [time-nuts] HP 10509A antenna specifications?
>
> I am refurbishing a HP117A VLF comparator and would like to recreate the
> outdoor antenna.
>
> I've cleaned up the A1 module where all of the 4.0uF at 60V caps leaked
> electrolyte damaging the wiring and ate holes in the ground plane on the
> PCB.
>
> I've also made most of the updates to bring the unit up to serial prefix
> 832 from a 512. Can't seem to find a human part number for the 1853-0009
> transistors though.
>
> I've also got new Nuvistors coming for module A1.
>
> So far my ferrite stick antenna doesn't have enough signal strength to make
> the meter twitch. But using a function generator it takes about a -80dBm to
> get the signal strength meter to come to the 10 mark.
>
> For the antenna It looks like the outer structure is just conduit and a
> couple of junction boxes but I would like to know if anyone has more
> detailed specifications of the loops inside the conduit. Such as number of
> turns and gauge of wire that was used in the original.
>
> Thank you!
> --Matt
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