## 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@kk9a.com" <john@kk9a.com>
To: towertalk@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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