K3-100 #1433: K3 ATU MALFUNCTION

[Jack]

Greetings to all,

 

Here is the text of a note I sent to k3support.  I hope someone has some
ideas.

On Saturday the 16th I noticed that the ATU gave a higher SWR than bypass
when transmitting to a resonant antenna. The difference was small so I
thought I would just note it and observe.

 

Today, Sunday the 17th I found that on 14.050 in bypass mode at 14.050 I get
a 1.1 to 1 reading but in ATU mode I get higher that 2 to 1 and a HI SWR
message.

On 7.050 I get 1.0 to 1 in bypass and 1.4 to 1 in ATU mode.

 

This is a change from when the rig was first built on Friday the 8th.
Originally if I had 1.1 in bypass I would get 1.0 in ATU mode.

 

Help! I thought I was up and running after a week of problems and now a new
one! Any suggestions would be appreciated.

 

Jack

 

 

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[Guy, K2AV]

Observations on KAT3 in #1239

Does not always set to 1:1 (think that is to be expected, particularly if close to 1:1 in bypass -- it has discrete values to switch in and out, not continuously variable components like my ATR-30)

Sometimes it will not "get started". This is usually someplace where the bypass SWR is high, like 2.5. It goes through the fast relay cycle, but does not fasten on a solution. In one of these situations, if I QSY to a place where SWR is lower and retry, it will solve it, and I can get to the original frequency it would not solve with two or three intermediate solutions.  So it's NOT that it DOESN'T have the range, it's just not finding it in the "solve" if the reach is too far.

I don't know of a way to place these solutions in memory (as in the MP) or if it is supposed to be doing that or if that is planned.

At the moment the KAT in the K2 has it beat badly on smarts and match range.

73, Guy.

Jack Regan-2 wrote

Greetings to all,

 

Here is the text of a note I sent to k3support.  I hope someone has some
ideas.

On Saturday the 16th I noticed that the ATU gave a higher SWR than bypass
when transmitting to a resonant antenna. The difference was small so I
thought I would just note it and observe.

 

Today, Sunday the 17th I found that on 14.050 in bypass mode at 14.050 I get
a 1.1 to 1 reading but in ATU mode I get higher that 2 to 1 and a HI SWR
message.

On 7.050 I get 1.0 to 1 in bypass and 1.4 to 1 in ATU mode.

 

This is a change from when the rig was first built on Friday the 8th.
Originally if I had 1.1 in bypass I would get 1.0 in ATU mode.

 

Help! I thought I was up and running after a week of problems and now a new
one! Any suggestions would be appreciated.

 

Jack

 

 

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