[Lowfer] active whips

[pbunn at patbunn.com]

The common mode choke are VERY important. Jack Smith has an excellent design 
at the Clifton Labs site. Uses about 26 feet of RG174 through a number of 
cores. It works well. I didn't believe how well they work.

I bought the CP666 also but Jacks design was a little more modern so I went 
with his. Anyone need a CP666?

Pat
N4LTA

-----Original Message----- 
From: cls
Sent: Tuesday, January 22, 2013 10:52 PM
To: lowfer at mailman.qth.net
Subject: Re: [Lowfer] active whips

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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