[TowerTalk] Broadband Match of 80/75M Dipole

[David Gilbert]

It wasn't switched.  The original query was for an Inverted-V.

73,
Dave AB7E



On 4/19/2019 6:34 PM, john at kk9a.com wrote:
> I saw dipole in the subject line and in K9YC's post. I did not notice 
> that the antenna was switched to an inverted V.
>
> John KK9A
>
>
> David Gilbert wroteL
>
> An EZNEC+ model of a 75M Inverted-V doesn't show any "deep nulls" on
> 30m, at least not compared to the pattern on 75m.  The broadside pattern
> is simply quite a bit narrower, if that's what you mean. As Jim says,
> though, the SWR is ridiculously high.
>
> Dave  AB7E
>
>
> On 4/19/2019 5:25 PM, john at kk9a.com wrote:
>>
>> Besides the high SWR and associated feedline loss that Jim mentioned, 
>> the antenna pattern would have multiple deep nulls.
>>
>> John KK9A
>>
>>
>> Jim Brown K9YC wrote:
>>
>> In my limited experience, no. My high (120-140 ft), coax-fed resonant
>> 80M dipoles exhibit VERY high SWR on 30M.  A good tuner might put some
>> power on the transmission line, but the loss would be very high. The
>> fact that they don't hear well on 30m is a clue.
>>
>> 73, Jim K9YC
>>
>> On 4/19/2019 4:42 AM, Mpridesti wrote:
>>> Hi Jim
>>>
>>> Thanks for sharing the prez.
>>>
>>> Question:  am considering recabling my 80 Inverted Vee as suggested. 
>>> Any speculation on its performance on 30 m?
>
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