[TowerTalk] VSWR Changes with Power

[ed_richardson at shaw.ca]

Thanks Jim and everyone else.  I discovered a pair of parasitic carriers on
15m only. The were down about 25 dB from the fundamental. They were +/-
about 700 kHz from the fundamental but drifted I placed a 15m BPF at the
input and now they are gone  

Now I have to look and see why this antenna load is causing this
instability.
Ed 

-----Original Message-----
From: TowerTalk <towertalk-bounces at contesting.com> On Behalf Of Jim Brown
Sent: October 20, 2019 3:41 PM
To: towertalk at contesting.com
Subject: Re: [TowerTalk] VSWR Changes with Power

On 10/20/2019 12:49 PM, ed_richardson at shaw.ca wrote:
> I will start sniffing around for a parasitic or harmonic.  The amp is 
> a solid state 1 kw model that according to the manufacturer is 
> unconditionally stable. I will see what shows up spectrally.

Hi Ed,

I would look first for issues with coax connectors, like junk connectors,
connectors that are not wrench-tight, poorly soldered shields. Also, I would
look carefully at bonding in your station and in your home. Study
http://k9yc.com/GroundingAndAudio.pdf  or N0AX's recent ARRL book on the
topic of grounding and bonding, which incorporates the concepts in the pdf.

73, Jim K9YC
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