[TowerTalk] 80 meter inv V

[Robert Harmon]

thanks Larry,

I did forget about the RBN.  Great for this testing !

Bob
K6UJ



> On Aug 28, 2015, at 10:57 AM, Larry <lknain at nc.rr.com> wrote:
> 
> Don't forget about RBN possibilities for checking signal strengths.
> 
> 73, Larry  W6NWS
> -----Original Message----- From: Robert Harmon
> Sent: Friday, August 28, 2015 1:33 PM
> To: Ham - Tower Talk
> Subject: Re: [TowerTalk] 80 meter inv V
> 
> 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 at 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 at gvtc.com
>> 
>>>> -----Original Message-----
>>>> From: TowerTalk [mailto:towertalk-bounces at contesting.com] On
>>>> Behalf Of Marsh Stewart
>>>> Sent: Thursday, August 27, 2015 10:16 PM
>>>> To: 'Marv Shelton' <marvs at att.net>; 'Ham - Tower Talk'
>>>> <towertalk at 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 at contesting.com] On
>>>> Behalf Of Marv Shelton
>>>> Sent: Thursday, August 27, 2015 9:21 PM
>>>> To: towertalk at 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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