K3 - SWR Fold-back

[Joe N9VX]

At what SWR value does the K3 reduce output power. Or to ask another way, at what SWR level will the radio coutinue to produce full output (without damage).

Thanks,

Joe  N9VX




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[AJSOENKE]

I don't know if this will help, but I've had two experiences with my K3
regarding power reduction. While attempting to participate in the 160M contest, I
connected to my 80M dipole and hit tune in the ATU active mode. I immediately
got a high SWR and retune cycle which reduced the SWR at the rig to ~ 10:1.
Checking the power output, which had been set at 106W, it was indicating 79W.  
During a second subsequent tune (same ant and same settings ) the rig initiated
a tune cycle and immediately shut down. No overpower/high current indication.
I turned the rig on again, and everything was the same as before.  I suspect
maybe the tune was marginal and that at that SWR the rig is between a 'continue
or shutdown' logic process. No residual effects were noted.
 
Al WA6VNN K3 #31



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[AJSOENKE]

In a message dated 12/11/2007 11:40:11 A.M.  Pacific Standard Time,
[hidden email] writes:
You don't suppose trying to  use an 80-meter dipole on 160 had anything to do
with it, do  you?

K9ZTV



[hidden email] wrote:

I don't know if  this will help, but I've had two experiences with my K3
regarding power  reduction. While attempting to participate in the 160M
contest, I
connected  to my 80M dipole and hit tune in the ATU active mode. I
immediately
got a  high SWR and retune cycle which reduced the SWR at the rig to ~ 10:1.  
Checking the power output, which had been set at 106W, it was indicating  
79W.  
During a second subsequent tune (same ant and same settings ) the  rig
initiated
a tune cycle and immediately shut down. No overpower/high  current
indication.
I turned the rig on again, and everything was the same  as before.  I suspect
maybe the tune was marginal and that at that SWR  the rig is between a
'continue
or shutdown' logic process. No residual  effects were noted.

Al WA6VNN K3 #31

Of course it had everything to do with it -  but an experiment is an  
experiment - I like to see what a well designed radio can really do. Besides I  made
a few dozen contacts on the 160M contest and they were the first contacts  
I've made on 160 in 46 years of hamming.  I rather enjoyed it! I hope the  info
was helpful in answering the question about SWR and rollback. Yes it does  roll
back, and very gracefully I'd say.
 
Al WA6VNN



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