[TenTec] 229B tuner: Slight upward creep of SWR

[Byron Cordes]

I would be surprised if 100watts would be making the caps change!  I think it would be a common mode problem. I would try to change ladder line length a little and if it a vertical antenna maybe more ground radials .
  I have had that problem before on a inverted L  140 foot long. Went down to 100 foot total length SWR rock solid running 1500 . 
  Also have changed ladder line length on one antenna doing the SWR creep. 
   And one other time just moving feed line 3 feet farther from steel sheeting fixed that problem. 
   There are many variables that could be the cause of SWR creep along with those caps. 
 Byron AC9PA.       73 ‘s

Sent from my iPad

> On Jul 23, 2018, at 6:46 AM, Bob McGraw K4TAX <rmcgraw at blomand.net> wrote:
> 
> Your balun is OK.  The ceramic disk capacitors are heating and changing value.  Usually they will return to near the original value when they cool.  As to damage, at some temp they will go "bang".  As long as you are satisfied with the performance you should be OK.  
> 
> Bob, K4TAX
> 
> 
> Sent from my iPhone
> 
>> On Jul 23, 2018, at 1:09 AM, Peter Klein <boulanger.croissant at gmail.com> wrote:
>> 
>> Thanks for all the good info. One thing though. The SWR creep may be a “clear indication“ that I am using the wrong balun, but that ain’t the case. I am using a 1:1 Guanella balun, 17 turns RG-58 on whatever torroid Rick, DJ0IP recommended. The antenna I noticed the “creep“ with is a 40 foot vertical dipole, which has quite low impedance on 40m and 80m even without the “help” of a 4:1 balun.
>> 
>> My purpose in asking my question was to ascertain whether it is safe to run my set up at 100 W despite the creep. I can easily tweak a dial to retune when running digital. And a creep never rises past 1.4:1, and usually less. I don’t care about perfection, I just want to make sure I’m not risking blowing any disc capacitors. My educated guess is that everything is fine, I simply wanted a reality check here.
>> 
>> Rest assured, if I was going to run higher power, I would be making the suggested modifications. But that’s not really in the cards right now.
>> 
>> --Peter, KD7MW
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