Topband: Beverage directivity

[Kenny Silverman]

Hi Karl,  yes CMCs are easy and should be installed regardless.  Even if they dont help with 40/80, they will likely help on 160.   Thanks for describing your experience. 

Regards , Kenny K2KW 

> On Jul 14, 2021, at 4:24 PM, Richard Karlquist <richard at karlquist.com> wrote:
> 
> 
> When I had beverages up (all 400 feet long), they have moderate directivity on 160, but worked better on 80, and were outstanding on 40 meters, such as long path to Europe.  This would tend to confirm that your 40 and 80 meter wires are killing the 160 meter directivity.  BTW, it is entirely possible that what is doing the damage is the *feedlines* for said antennas, not necessarily the antennas themselves.  Time for K9YC common mode chokes?
> 
> ---
> Rick Karlquist
> N6RK
> 
> 
>> On 2021-07-14 10:10, Kenny Silverman wrote:
>> 
>> Most if not all replies were off line, and thanks to all who wrote in. 2 key ideas came out:
>> 1) try and reduce the height of the leads at each end of the beverage. But they are not exceptionally high so I don't think that's it
>> 2) the other is the beverages go under the 80m wire yagi and the 40m inverted V.  Those antennas are almost certainly killing the beverage patterns on 40/80 and the only solution is to detune the 40/80 antennas when not transmitting.   That may be an issue when I finally get around to porting the Rx  antennas to both of the SO2R radios. Luckily they work on 160 which is the real need. I will have to see about getting another 80m Rx antenna for domestic summer contesting
>> 
>> A map of my antennas is now on the bottom of my www.qrz.com/dB/K2KW page. 
>> 
>> Regards , Kenny K2KW 
>> 
>>> On Jul 12, 2021, at 11:16 AM, Kenny Silverman <kenny.k2kw at gmail.com> wrote:
>>> 
>>> Last winter I installed 3 single-wire beverages:
>>> 625' to EU
>>> 625' to Carib/SA
>>> 450' to west coast
>>> 
>>> On 160 the directivity is great, but it's poor on 80/40. Any thoughts on why?  I don't have CMC's on them, could that be the issue?
>>> 
>>> Regards , Kenny K2KW
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