[TowerTalk] VSWR Changes with Power

[K9MA]

Do you have another amplifier with which to run a test?

73,
Scott K9MA



On 10/20/2019 17:33, ed_richardson at shaw.ca wrote:
> 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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-- 
Scott  K9MA

k9ma at sdellington.us