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@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@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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