From: Laurence KL7 L <hellozerohellozero@hotmail.com>
To: "rsgb_lf_group@blacksheep.org" <rsgb_lf_group@blacksheep.org>
Thread-Topic: LF: No 2200m TX tonight
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Date: Sun, 25 Nov 2018 22:37:51 +0000
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 Content preview:  so.... try using a hair dryer on heat on your coil/components
    before use and see if you can heat (hit) the target and see any differences
    on power up or youve driven moisture out or small movement... 
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Subject: Re: LF: No 2200m TX tonight
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so.... try using a hair dryer on heat on your coil/components before use and see if you can heat (hit) the target and see any differences on power up or youve driven moisture out or small movement...

Laurence KL7L/KH6

> On Nov 25, 2018, at 9:10 AM, N1BUG <paul@n1bug.com> wrote:
> 
> So...
> 
> I eliminated the shorted turn at the base of the big coil. Now any
> turns below the tap which goes to the "hot" side of the ferrite core
> impedance matching xfmr just float.
> 
> Three things I noticed were:
> 
> 1. Loaded Q is much higher!!!
> 
> 2. I had to move the tap further up the coil to resonate the system
> (less inductance.... or at least fewer turns).
> 
> 3. The bottom of the coil no longer feels warm after a TX period.
> 
> I ran the TX for 15 minutes at 25W RF output. There was no change in
> phase of voltage / current on the feed line, but the voltage
> increased slightly during the 15 minutes.
> 
> I then ran the TX for 15 minutes at 100W RF output. I have the same
> problem as before: during the first several minutes resonance shifts
> and current on the feed line increases greatly. This is a very slow,
> steady change. There are no sudden jumps. After the TX stops it
> takes only a few seconds for things to return to the "cold" levels.
> That is, if I stop the TX after 15 minutes, then start it again
> after 20 seconds the phase and voltage/current magnitude is almost
> back to where it was before any TX at all.
> 
> Must be something heating up very slowly, then cooling quickly after
> RF stops. But I cannot find it. I think I have to buy one of the
> inexpensive IR heat guns and try to examine the coil and hardware
> while the TX is running. Maybe it will see something.
> 
> Now we have freezing rain and snow so I had to stop all testing. No
> good wx forecast until Thursday!
> 
> 73,
> Paul
> 
> 
> 
>