Hi Harold
My way is travelling a random path and finding whatever is fast, cheap
and available because if I look too long the urge soon goes away. There
are too many distractions along the path, and at times create a greater
urge. So one has to drop the lesser urge and pursue the greater urge.
It too, can be sidelined.
Another options is a frequency selective voltmeter, they used to be real
cheap but now not so because I think the VLFers have their eyes on them.
I still see the odd one at hamfests for about $20.00.
Yes I agree that a transistor osc. or a 6BE6 would do the trick.
I kept one HRO for sentimental reasons and to waste gravity and
somewhere in a box I have stored some odd ball coils. I'll have to see
if I have LF. I might because interest in LF and VLF is one of my
chronic diseases that is currently in remission.

--

73
Hank WD5JFR
"Harold E. Johnson" wrote in message
news:y1lLk.343105$TT4.248866@attbi_s22...

"Henry Kolesnik" wrote in message
...
I've seen HRO's for less than $50.00 at hamfest without coils! The
VLF
coil might be hard to find but you'd end up with less stuff and less
work!

--

73
Hank WD5JFR

Hi Hank. You're right, but I've never seen a set of LF coils for the
HRO
despite seeing (and owning) several HRO's. Then you need to factor in
the
expense of the additional room you have to build to house the thing,
seems
terribly expensive to go to all that trouble to replace a DBM, a low
pass
filter and a one transistor crystal oscillator to build an up
converter. Use
whatever you've got for the IF.

W4ZCB

Another options is a frequency selective voltmeter, they used to be real
cheap but now not so because I think the VLFers have their eyes on them. I
still see the odd one at hamfests for about $20.00.

WOW! I have a HP-312/313 pair that I paid a couple hundred for, but I
wouldn't let them go for twice that.

Yes I agree that a transistor osc. or a 6BE6 would do the trick.
I kept one HRO for sentimental reasons and to waste gravity and somewhere
in a box I have stored some odd ball coils. I'll have to see if I have
LF. I might because interest in LF and VLF is one of my chronic diseases
that is currently in remission.

If I want to use WWVB, I can use the 312 (With a surplus filter to keep the
59 KHz from the video monitor 2 floors away out of it) or a little TRF/PLL
RX I built for that maybe 20 years ago. Interestingly, my loop, (100 turns
on a 32 inch bicycle rim) resonates at 60 KHz with a big ARCO trimmer, but
resonates right at 24 KHz for NAA with just a alligator clipped on 1890 pF
silver mica. I monitor that with a simple DBM/crystal oscillator (with a 96
KHz oscillator and a divide x 4 74AC74). Lots of signal. I used to monitor
with an old Rustrak paper tape recorder, but a few years back, Radio Shack
had a special on for Metex Voltmeters that had an RS-232 output and a piece
of software that would send a reading to a file on the computer. Now I just
throw away the parts of the file that are uninteresting and save the SID's.

Interesting part of the spectrum, I also did a BC-453 conversion solid state
and to 136 KHz several years back, that was a learning experience but not
terribly interesting.
W4ZCB