Problem on 80m SSB.
I am experiencing what I can best describe as ATU Flashover on 80m SSB.
Background - I have a K3 and Challenger 3 linear amplifier. Headgear is the
Heil Proset plus. I can tune up the rig and amp to well in excess of 500W
without any problem. CW can be operated at full
Terry
you do not mention the lenght of your inverted L. However if it is end fed
then it is unlikely to be exact 50 ohm. Then the length of coax gets
important because it may do an impedance transformation.
What is happening is that your tuner works in a high impedance load and that
means high
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[mailto:[EMAIL PROTECTED] On Behalf Of G4MKP
Sent: Friday, October 17, 2008 10:47 AM
To: elecraft@mailman.qth.net
Subject: [Elecraft] ATU Flashover
Problem on 80m SSB.
I am experiencing what I can best describe as ATU Flashover on 80m SSB.
Background - I have a K3
Terry,
As another responder indicated, you have a high impedance at the
feedline/ATU junction - a high impedance translated into a higher
voltage for any given amount of RF, and when that voltage is high
enough, the tuner capacitors will arc. When they arc over, the
capacitance changes
Define 275W. Is that PEP or is that average. If it is what the meter reads
the SSB peaks might be much higher. I assume you actually knew this.
Another possibility is the K3 power spike on first SSB syllable, that might
be higher than the one on CW. Whenever you change mode or power setting, the
portions. What freq is the antenna tuned for?
_
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of G4MKP
Sent: Friday, October 17, 2008 8:47 AM
To: elecraft@mailman.qth.net
Subject: [Elecraft] ATU Flashover
Problem on 80m SSB.
I am experiencing what I can best describe
Don
Spot on! Thank you and also to Mike, W0MUshould have picked this up
myself. Haven't done any operating over the last few weeks but I have been
tidying up the antennas around the garden. Whilst doing this I thought that
I would improve my 80m antenna by firstly spreading the radials out a
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