[Lowfer] Active Whips

[pbunn]

The website has the complete plans for the choke. He does not sell them.
Google Clifton Labs .

Pat
N4LTA

Laurence KL1 X <hellozerohellozero at hotmail.com> wrote:


Wonder what type he uses- J's or maybe a lower mu (77's) a wide-band non res compromise?

Sent and miss typed
from my iPhone - waiting for a plane....

On Jan 24, 2013, at 7:43 AM, "pbunn" <pbunn at matrixei.com> wrote:

> Jack Smith has some very effective chokes on the Clifton Website that he recommend for use with active probes. They involve about 28 feet of RG174 wound  on four cores in series. The cores are not cheap, if I remember correctly about $25 per set. The chokes are effective down to VLF frequencies. With them hooked to a probe that expects to see a feed line as an element (the PA0 design), they probably had a bad effect on performance.
>
> Pat
>
> -----Original Message-----
> From: lowfer-bounces at mailman.qth.net [mailto:lowfer-bounces at mailman.qth.net] On Behalf Of Dexter McIntyre W4DEX
> Sent: Thursday, January 24, 2013 10:29 AM
> To: Discussion of the Lowfer (US, European, &amp; UK) and MedFer bands
> Subject: Re: [Lowfer] Active Whips
>
> pbunn wrote:
>> I built that antenna last year making a nice PCB board for it and using the PC Board as the antenna element and installed chokes. The antenna was a very poor performer and it biased me against active probes. The chokes probably made it a bad performer. My Clifton Labs probe antenna is mounted on a 8 foot mast in the water at the edge of a small pond 300 feet from any house or power line. The whip is extended about 6 feet. Maybe I should elevate it more?
> Interesting comments about the RDT design.  I wish I had done more meaningful active antenna comparisons last fall while I was out in the open operating portable in the van.  It's way to cold for me to try that now but my interest has been renewed.  Many years ago when the only active antenna I had, a simple MPF-102 design, was that it performed much better mounted on top of the van than on a mast beside the van.
> Even with the antenna elevated twenty feet the antenna gave much more signal on a mag mount right on top of the van.  This antenna was built in the coil base of an NMO VHF 5/8th wave mobile antenna and used the original approximate 36" whip.
>
> Dex
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