[TowerTalk] Mosley Antenna Question

[Joe Subich, W4TV]

> ## sadly to say, yes indeed, a C3 will outperform a TH7-DXX. K7LXC
> already ran that test. N6BT ran the test as well, using a spectrum
> analyzer at the RX end,  with SA set to 2db per division.

The raw data in the 2nd Edition of the N0AX/K7LXC reports does not
support your conclusion.  One can argue whether difference justifies
the larger antenna but the raw data shows significantly higher gain
and F/B for the TH7 on all three bands.

73,

   ... Joe, W4TV


On 2015-02-24 2:34 AM, Jim Thomson wrote:
> Date: Mon, 23 Feb 2015 11:23:38 -0600
> From: "john at kk9a.com" <john at kk9a.com>
> To: towertalk at contesting.com
> Subject: Re: [TowerTalk] Mosley Antenna Question
>
> The TH7 is not a bad antenna, I find it difficult to believe that a C3 out
> performs it.  I had the world high 20m score in the last WPX CW using a
> Hy-Gain TH7DXX
>
> John P40A
>
> ##  sadly to say, yes indeed, a C3 will outperform a TH7-DXX.  K7LXC already ran that test.
> N6BT ran the test as well, using a spectrum analyzer at the RX end, with SA set to 2db per division.
>
> ## another method that works superb is to shut OFF the  RX agc at the RX end.  Then back down the
> RF gain a whole bunch.   Then apply the rx audio to standard audio test gear, or telco test gear.  That
> will easily read in .1 db increments.   We had wiltron test gear at the telco I worked at, that would read in
> .05db  increments.   As long as the TX applied cxr stays constant, and the wind is not flopping eles  all over
> the map, the results are dead on accurate..and repeatable.   You can apply the cxr at either ant, with
> audio test gear, or sa at the opposite end.   The usual deal is to apply the cxr at the far end.....
> with the sa  or audio gear connected to a xcvr or rx on the ant under test...then toggle between two
> ants under test.  Like a TH7-DXX  and a C3, etc.
>
> ##  A C3 is like 4.1 dbd....and your TH7-DXX is less than that.    The sa or audio gear just reads it as..
> X on ant #1..... and   + /-  X  on  ant #2.
>
> ## Compare a C3  with a Mosley  TA-33jr in the above format....and the results will make u gag.  Gets
> even worse when a TA-32jr is used.
>
> Jim  VE7RF
>
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