[Elecraft] Off Topic -- Yagi Antenna SWR measurement ?

[John Santillo]

The lower the frequency the harder it is and I found standing the antenna up
on end didn't work well either.  

What I do especially at the lower bands is put the antenna up in the air
around 10 to 12 feet and adjust it to just below the bottom of the band.
For example for 40M I would tune for best VSWR at 6.95MHz.  Then when the
antenna was raised the resonant point moved up in frequency to 7.1MHz.  I
know it's not the best way but it worked.


73,

John
N2HMM

-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Mel Farrer
Sent: Friday, July 12, 2013 11:42 AM
To: WM3M; mcduffie at garymcduffie.com; elecraft
Subject: Re: [Elecraft] Off Topic -- Yagi Antenna SWR measurement ?

I used a 12 foot tall four leg scissor ladder.  Close but no cigars.  The
lower bands will probably show the higher SWR, and a lower shift in freq
response.  As long as the pass band is close it will probably be OK.

Mel, K6KBE




________________________________
 From: WM3M <wm3m at live.com>
To: mcduffie at garymcduffie.com; elecraft <elecraft at mailman.qth.net> 
Sent: Friday, July 12, 2013 8:09 AM
Subject: Re: [Elecraft] Off Topic -- Yagi Antenna SWR measurement ?
 

What I have done is clamp it to my wooden deck railings on a 8 foot mast, 
the higher your deck is the better.
That worked pretty well for me, little change once it was up in position.
73 good luck
Emory  WM3M

-----Original Message----- 
From: AG0N-3055
Sent: Friday, July 12, 2013 10:58 AM
To: elecraft
Subject: Re: [Elecraft] Off Topic -- Yagi Antenna SWR measurement ?

On Fri, 12 Jul 2013 07:50:43 -0700, Phil Hystad wrote:

> Question:  is this accurate or does the proximity of ground (maybe two 
> feet high)
> so strongly affect the SWR reading that the measurement is not accurate.

Not accurate at all.  Most manufacturers say to stand the beam up so it
is pointed straight up into the sky, reflector down, to do such checks.
I still don't trust that, but is better than having it parallel to the
ground.  Keep everything (including yourself) away from the elements
during the test.  Get it out in a clear yard, as far from wires and
buildings as possible and point it into the sky.

Gary
-- 
http://ag0n.net
3055: http://ag0n.net/irlp/3055
NodeOp Help Page: http://ag0n.net/irlp
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