[TowerTalk] Broadband Match of 80/75M Dipole

[john at kk9a.com]

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?