Topband: WWROF Webinar - High Performance RX Antennas for a Small Lot
grants2 at pacbell.net
Sat Mar 5 20:21:23 EST 2016
Great presentation! It inspires a question about detuning a vertical:
The goal is to reduce noise and any pattern distortion in my receive 4
sq (DXEng) which is about 200' from my transmit vertical.
My 160m transmit antenna is a 75' vertical T with 8x 125' radials 8-10'
above ground. I've positioned the radials a bit asymmetrical to
maximize separation to the 4sq. I can detune the antenna to a 2.3Mhz
resonance with a 300pf series capacitor. Is that sufficient or do I
need to do something to the radials? Is there a better way to detune it?
The 4sq shows excellent directivity on 80m, 5+ S units on a 756PIII.
With a 70' baseline I expect less directivity on 160m but not nada which
seemed the case in the SSB contest last week.
On 3/5/2016 5:15 AM, Ken Claerbout wrote:
> Thanks to JC N4IS for his excellent presentation on lowband RX
> antennas and
> to WWROF for their continued sponsorship of the Webinar programs. We had
> almost 500 people register for this event! The recorded Webinar along
> a copy of JC's slides has been posted to:
> Ken K4ZW
> Topband Reflector Archives - http://www.contesting.com/_topband
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