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

[paul swed]

I have had the chance to look at a LORAN C antenna at 100 KHz. Same
concepts. There were not that many turns as I recall.
The reality, this antenna and preamp appear to be in very good physical
shape considering they have been in the WX some 40 years.
When working it should make up the rest of the gain you were looking for.
The last email was -85 db. Might guess down to 90-100.
If possible check the electrolytic cap at the bottom. It also looks like
the resistor to the left may be discolored. Maybe fine.
You can generally still get old NOS nuvistor tubes. I picked up 2 sets for
my 117s.
The preamp also has the nice 60 KHz xtal filter. A good find for you.
Good luck
Paul
WB8TSL

On Fri, Apr 14, 2023 at 3:53 PM Matt Krick via time-nuts <
time-nuts at lists.febo.com> wrote:

> Aftter some searching I was able to locate an antenna, which might be the
> actual antenna that was in use with my HP-117 on the roof top of a lab
> building in an undisclosed location of the Nevada Desert.
>
> Looks like there is either 18 or 20 gauge magnet wire in this loop, which
> is mind boggling to think about how it was wound in there.
>
> On Thu, Mar 2, 2023 at 7:11 AM Matt Krick <dcflux at gmail.com> wrote:
>
> > New tubes in the A1 module got me another 6 dB to get it to -84dBm to
> > bring the needle to the 10 mark on the signal strength meter.
> >
> > I also replaced the chokes for the antenna DC filter, one was open
> > completely and the other two were no where near 1000uH.
> >
> >
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