Hi John:
I found the AMRAD active antenna was designed for 137 kHz operation and
was very noisy at 60 kHz. See:
http://www.prc68.com/I/LF-Ant.shtml
PS the AMRAD specified fuse is maybe 100X the value needed to protect
the transformer from a short on the coax. Guess how I learned this.
The McKay Dymec DA-100 is an excellent active whip antenna for VLF.
http://www.prc68.com/I/DR33.shtml#DA100
Have Fun,
Brooke Clarke
http://www.PRC68.com
John Ackermann N8UR wrote:
Here's the page I wrote years ago on the split-shield antenna:
http://www.febo.com/time-freq/wwvb/antenna/index.html
Unfortunately, I never took any photos and the antenna is now in
pieces after a couple of moves.
I've also had good luck using an active voltage probe antenna to
receive both WWVB and LORAN-C. The one I used was designed by the
AMRAD group (info at http://www.amrad.org/projects/lf/actant/).
John
----
Perry Sandeen said the following on 10/19/2010 11:43 PM:
Gents,
Wrote:< John's antenna should be in the archives. Just 100 feet of
RG-58 wound on a 4 foot diagonal PVC pipe frame, with the shield
split at 50 feet, IIRC. Tried resonating it, got unstable results.
<snip>
Could you please elaborate on the construction details such as co-ax
used, indoors or out, and type of tuning caps used, ect? What was
the input amp used?
I was planning on making that antenna but don’t want to go to all the
effort for a bust. My antenna would be outside and I plan on using
some RG-6.
Regards,
Perrier
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--
Have Fun,
Brooke Clarke
http://www.PRC68.com
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