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Re: [TowerTalk] Tuner SWR won't stay down

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Subject: Re: [TowerTalk] Tuner SWR won't stay down
From: Tom Osborne <w7why@frontier.com>
Date: Thu, 01 Jan 2015 19:50:57 -0800
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
Hi Robert.

Thought about that, but when the tuner is not in the 'tune' mode, it works fine just straight through.

That is still a good idea.  Will check it out tomorrow.  73
Tom W7WHY




On 1/1/2015 5:24 PM, Robert Serfas wrote:
Try checking the coax connectors where they mount to the chassis. I had a MFJ 
tuner that had wildly variable SWR, turned out it was the riveted so-239 
connectors. Cleaning the places where connectors mount and replacing the rivets 
with 4-20 hardware with lock washers cured it.

Sent from my iPad

On Jan 1, 2015, at 7:15 PM, Tom Osborne <w7why@frontier.com> wrote:

Hi Roger.

Yes, I did try that. I disconnected the torroid from the circuit.  I think it 
is something getting hot but just can't feel anything that gets overly warm 
inside.  It does drift faster at high power than at low power.  I also 
connected the input coax connector directly to the capacitor and the output 
coax jack to the other cap.

I thought it might be the coil getting hot, but it is not even getting warm.   
May end up scrapping it and just using the parts to build something else.  It 
is a real puzzler.  Thanks and 73
Tom W7WHY



On 1/1/2015 2:39 PM, Roger (K8RI) on TT wrote:
Have you checked the toroid? It's been a few years since I had one, but IIRC 
the toroid is always in the circuit on the 989C.  If not, how about the output 
selector switch?  I've purchased more than one tuner/antenna switch etc that 
had missing solder joints, or bridged connections from too much solder.

73

Roger (K8RI)
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