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?
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk