Recently I have been using an Orion 1 - I managed to get some nasty volts into
it and blew the microprocessor - it has gone for repair back to your side of
the world.
I then got out my trusty K2/100 and ATU - it was working Ok last time I used
it - about a year ago. The ATU now appears to be faulty.
I had put into place current baluns and 10 rings on my 20 ft feeder - I think
it should solve my problems with the Orion and I don't think it is the reason
why the K2 ATU is faulty
I have a multi 9 band antenna which is below 3 : 1 on all bands except 20, 12,
and 10 metres which are about 8 : 1 using a MFJ 207
The K2/100 without the ATU is OK on the 6 bands below 3:1, both on Low and High
power.
With the ATU connected on LOW power it tunes all 9 of the bands to 1.1 : 1
except for 17 m which is 1.3 : 1 (a peculiararty with which I'm not concerned)
On HIGH power the ATU tries to TUNE but is unsuccessful on ALL Bands - It
indicates High Reflection and sticks in the TUNE position until I depress the
button again - this might suggest I still have high voltages around the shack
BUT
With the K2/100 and ATU terminated in a quality 500W 50 ohm dummy load using an
18 inch long 50 ohm double sleeved co-ax, the symtoms are the same - it will
tune on LOW power but has exactly the same problems on HIGH in that it fails to
tune (allthough it looks as if it tries) and ends up indicating High Reflection
and the power is automatically reduced.
I am deaf so I cannot confirm that the relays are all working - but the fact
that it successfully tunes on Low Power suggests all is OK
Would appreciate some pointers as to were I should be looking from the experts
on this rig.
73 John (G4BOU)
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