Topband: Low Dipoles

[donovanf at erols.com]

Topband Guru W4ZV wrote an excellent comparison of the relative 
merits of vertical and horizontal antennas on 160 meters. 



Bill's excellent: "You can never have too many antennas!" 
is often quoted with my important corollary: 


"unless they interfere with each other" 

which they all too often do... 


73 
Frank 
W3LPL 


----- Original Message -----

From: "Bill Tippett" <btippett at alum.mit.edu> 
To: "topband" <topband at contesting.com> 
Sent: Monday, December 14, 2020 1:31:40 PM 
Subject: Re: Topband: Low Dipoles 

W3LPL wrote: 
"I've never found them to be more effective receiving antennas than Beverages 
or arrays of short verticals at sunset or at any time during the night" 

I have a inverted-V with apex at 100' and ends at 30' that I specifically 
put up for high angle conditions. I also have a quasi-4SQ Tx antenna about 
300' away. The Eznec plot below shows the breakeven TOA is around 45 
degrees. I usually see +10 dB in favor of the 4SQ which you can see on the 
plot happens at TOAs below 15 degrees. 

https://photos.google.com/photo/AF1QipM_OgfeUmNPr7fPJL2YApvxE5HaQbajJDfYlD-M 


Most (>99%) of the time what Frank says is true. However there are rare 
occasions when the inv-V is stronger than the 4SQ indicating high angles. 
Normally I receive on Beverages and TX on the 4SQ but the tipoff to check 
for high angles is when Beverages lose directivity. When this happens it 
indicates high angles, so I then switch to both TX/RX on the inv-V. For me 
this most often occurs just after sunset and only lasts 30 minutes or so. 
However in contests I've had significant runs of deep z16 and even deeper 
stations which have significantly added to my points and mult totals. 
Sunrise also shows peaks but not as pronounced as sunset. High angles can 
also occur during significant solar events but this is more rare than at 
sunset/sunrise. 

"You can never have too many antennas!" 

73, Bill W4ZV 
_________________ 
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