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

[Gordon Batey]

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
_______________________________________________
time-nuts mailing list -- time-nuts at lists.febo.com To unsubscribe send an
email to time-nuts-leave at lists.febo.com