Jim,
I see your point. I have easy to install (and extend up in the air)
telescoping supports for the ends of the V.
I've found I can go from 10 feet to 38 feet with them. I am going to test the
antenna at 10 foot high
ends and then 38 foot high ends. I have a ZL friend in New Zealand that will
give me the signal
differences. It will be a fun test to see what happens. I have a big Johnson
matchbox in line to
match any increase in SWR.
Thanks to you and Marsh for the info. I will let you know the results.
73
Bob
K6UJ
> On Aug 28, 2015, at 7:04 AM, Jim Hargrave <w5ifp@gvtc.com> wrote:
>
> Another consideration: As you increase the apex angle, the feed
> impedance will increase and the radiation pattern will no longer be
> Omni-directional. A Mismatch can result in offsetting any expected
> gain and the radiation pattern might not be in the desired
> direction.
> An Apex of 90 degrees provides a good 50 ohm match and near
> Omni-directional pattern.
>
> I have used successfully used Inverted Vs and Slopers for 61 years
> and subscribe to the college of hard knocks: Try it, If it works to
> your satisfaction, be happy. That gives you bragging rights. In
> 1954 we never heard of EZNEC, but the antennas didn't know the
> difference.
>
> 73, Jim - w5ifp@gvtc.com
>
>>> -----Original Message-----
>>> From: TowerTalk [mailto:towertalk-bounces@contesting.com] On
>>> Behalf Of Marsh Stewart
>>> Sent: Thursday, August 27, 2015 10:16 PM
>>> To: 'Marv Shelton' <marvs@att.net>; 'Ham - Tower Talk'
>>> <towertalk@contesting.com>
>>> Subject: Re: [TowerTalk] 80 meter inv V
>>>
>>> Suppose the ends of the 80M inverted V were each raised to 90
>>> feet - the height of the apex of the original inverted V. The
> apex
>>> angle would increase to 180 degrees and the antenna would be a
>>> flat-top dipole. The elevation angle of maximum gain would
>>> decrease. At elevation angles lower than the maximum gain angle
>>> the gain would also increase. The original post as I understood
> it
>>> was about increasing gain at lower elevation angles for better DX
>>> performance.
>>>
>>> 73,
>>> Marsh, KA5M
>>>
>>>
>>> -----Original Message-----
>>> From: TowerTalk [mailto:towertalk-bounces@contesting.com] On
>>> Behalf Of Marv Shelton
>>> Sent: Thursday, August 27, 2015 9:21 PM
>>> To: towertalk@contesting.com
>>> Subject: Re: [TowerTalk] 80 meter inv V
>>>
>>> Doesn't the take-off angle increase as the apex angle increases?
>>>
>>> Sent from my iPad
>>> And YES it's cool!
>>>
>>>
>>> _______________________________________________
>>>
>>>
>>>
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>
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