[time-nuts] 60KHz Antenna Cont'd

[Brooke Clarke]

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