[Lowfer] active whips
cls
cls at employees.org
Tue Jan 22 17:52:41 EST 2013
glad to hear they work well, I basically have no other choice.
my 30-winds 1 meter loop doesn't seem to work very well. I can pick up
wwvb and that's it. I built it for VLF but all I get is noise. it
certainly has too many winds for LF but I figured I could probably get a
little something, maybe on 137kHz ... nothing. it will get the 500kHz
AM stations, but not 518kHz navtex.
it's probably mostly my location - Palo Alto, CA (CM87) many 1000s of
kilometers from all y'all, surrounded by leafy trees and other buildings
and lots of 60Hz wiring... so no place for a long wire of any kind.
Cliff K6CLS CM87
On 2013-01-22 14:12, Pat Bunn wrote:
> I was always very skeptical of active antennas . My engineering
> background made it hard to believe that less conductor could be
> better. About a year ago after doing some research I bought Jack
> Smiths antenna and installed it with his recommended common mode
> chokes. It is the best thing I have done in a long time. I generally
> hear anything that others can hear. I am sure that it does not
> compete
> with long Beverage antennas but it does a heck of a job for me.
> I also know that Doug uses one also and he does as well hearing as
> about anyone that I know off.
>
>
> Pat
> N4LTa
>
> "Douglas D. Williams" <kb4oer at gmail.com> wrote:
>
>>Having noticed some recent comments on this reflector that disparaged
>>active whip ("e-probe") antennas as effective VLF/LF receive
>> antennas, I
>>must respectfully disagree.
>>
>>Unless you live in a very QRM quiet envirnoment, I don't think you
>> can do
>>much better at LF than a good quality active whip, located away from
>> noise
>>sources and trees/buildings, and shielded by common mode chokes.
>>
>>73, Doug KB4OER
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