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

[Brooke Clarke]

Hi Matt:

There were two versions of the loop antenna.  The early one used a couple of 13CW4 Nuvistors and the newer one used FETs.
https://prc68.com/I/117A.shtml

-- 
Have Fun,

Brooke Clarke
https://www.PRC68.com
axioms:
1. The extent to which you can fix or improve something will be limited by how well you understand how it works.
2. Everybody, with no exceptions, holds false beliefs.

-------- Original Message --------
> 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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