[Lowfer] Active Whips

[pat bunn]

On 1/24/2013 10:41 PM, Mitch Powell wrote:
> Pat - there is also mention and a picture of a simpler one - that appears to use only two cores - and is built
> in a piece of 2 inch pvc...... but no information apart from that..... could it be that simple ?
> Mitch
> On 2013-01-24, at 10:43 AM, pbunn 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
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I think a simpler one would be like Doug's, only using the Digi Key 
available cores for LF only. I built mine as an all band choke as I like 
to use the antenna on 160,80 and 40 meters.

I have ten of those type cores and I am building a "sorta like" W1VD's 
amplifier for 150 watts or so. I am going to try one as the output 
inductor because I don't have a 1.4 " type 77 core and the 2.4 " is a 
little large for that power level.

Pat