[TowerTalk] Radials, resonance and the MFJ259

[Dick Green]

My good SWR/Power meter (Nye RF Power Monitor) is attached to the output of the amp, so I don't see any SWR affects from the amp. I can also measure SWR/Power with the built-in unit in the TS950SDX. The amp affects SWR a bit, but not so much that it would bother me.

73, Dick, WC1M

-----Original Message-----
From: Pete.Smith. <n4zr@contesting.com>
To: Pete.Raymond. <n4kw@citrus.infi.net>; Bill.Fisher.-.W4AN. <w4an@contesting.com>
Cc: towertalk@contesting.com <towertalk@contesting.com>
Date: Saturday, December 20, 1997 1:30 PM
Subject: Re: [TowerTalk] Radials, resonance and the MFJ259


>At 09:02 AM 12/20/97 -0500, Pete Raymond wrote:
>
>>>I have an AEA SWR121 and it tracks with my Bird wattmeter.  One thing that
>>I have found is that
>>my Alpha bumps up the vswr a little. When the linear is in bypass the xcvr
>>shows a different vswr
>>reading than if I remove the coax from my switch and measure with the AEA
>>unit.  Again the reason 
>>being is that the linear bumps up the vswr a little.  Not sure if this is
>>your condition but one to
>>consider. 73 Pete N4KW, Inverness, Fl.
>>
>
>In my case, the amp makes a huge difference.  Just measuring with my
>transceiver, if I measure through the amp my lowest SWR on 20 falls well
>above the band - 14450 or thereabouts - while measuring without the amp, it
>falls at about 14200. My Autek tracks very well with the transceiver in
>this respect.  Quantitatively, the minimum SWR readings are similar, both
>with the amp and without.  Clearly, these are transmission line
>"transformer" effects, intended or not.  If your feedline isn't perfectly
>matched and a multiple of a half wave at the operating frequency, the only
>way to see real resonant frequency is to measure at the antenna.  At the
>antenna, the resonant frequency is 14175.
>
>73, Pete Smith N4ZR
>n4zr@contesting.com 
>
>"That's WEST Virginia.  Thanks and 73"
>
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