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.
Grant KZ1W
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
with
a copy of JC's slides has been posted to:
http://wwrof.org/webinar-archive/high-performance-rx-antennas-for-a-small-lot/
73
Ken K4ZW
_________________
Topband Reflector Archives - http://www.contesting.com/_topband
_________________
Topband Reflector Archives - http://www.contesting.com/_topband
|