[time-nuts] 60KHz Antenna Cont'd
brooke95482 at att.net
Wed Oct 20 16:56:04 UTC 2010
I found the AMRAD active antenna was designed for 137 kHz operation and
was very noisy at 60 kHz. See:
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.
John Ackermann N8UR wrote:
> Here's the page I wrote years ago on the split-shield antenna:
> 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/).
> Perry Sandeen said the following on 10/19/2010 11:43 PM:
>> 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.
>> 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.
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