[Elecraft] KAT100 IN EC2 ENCLOSURE

[Don Wilhelm]

Jerry,

If you set the power to 40 watts as I asked, you should not have 120 
watts output with TUNE.
First you have to fix that power control problem.  The most likely cause 
of that is the wattmeter diodes D16 and D17 in the KPA100. They are 
1N5711 diodes, and you should order 4 of them so you can have 2 to 
replace the ones in the KAT100 if necessary.

After replacing those diodes, test the KPA100 mounted on the base K2, 
*not* in the EC2 enclosure.  If you still do not have good power control 
- a TUNE with the KPA100 only connected to the base K2 should produce 20 
watts, TUNE + DISPLAY should produce the power you have set on the power 
knob.

In the meantime, you might try removing the KPA100 from the EC2 
enclosure and operating the KAT100 only from the base K2 (you will have 
to power the KAT100 from the 2.1mm power jack).  Again, first into a 
dummy load with the external wattmeter connected in-line. With the ATU 
menu set to CAL, does the external wattmeter agree with the power 
displayed on the K2, and does the SWR agree (during a TUNE)?  If so, the 
wattmeter diodes in the KAT100 are OK.
Next, set the ATU menu to AUTO and see if the KAT100 tunes to the dummy 
load.  If not, either the firmware is faulty or U2 or U3 or U4 may be 
faulty.

You can go into the ATU menu and activate each relay individually - see 
the KAT100 manual.

73,
Don W3FPR

On 1/2/2016 11:01 AM, Jerry Ford wrote:
> Good Morning Don:
> I did as you instructed.  On 40 meters the watt meter is reading 120 watts.
> I have 1 LED showing on the tuner.  The display on the K2 shows 52 wattsand 1.1-1  SWR
> As I change bands,  the results change.   The higher bands are showing less power out and SWR up to  1.5-1..     The number of LED'sshowing on the tuner agree with the SWR indicated on the K2's display.
> The tuner does not attempt to tune.  I do not hear the relays changingas I move from band to band.  Entering  " TUNE "   mode is the sameas entering transmit with my straight key.
> I have to tap my key or one of the button on the K2  to exit TUNE.
> Where does this take us ??
> Thank you Don and Happy New Year:
> Jerry             N0JRN
>
>
>
>
>
>        
> First put an in-line wattmeter and a dummy load on the KAT100 ANT1
> connector, set the power to 50 watts and then enter TUNE.
> 1) does the tuner tune so no LEDs are lit on the KAT100?  If no, how
> many are lit?
> 2) what is the power indicated on the wattmeter (it should be about 20
> watts)?
>
> You may have "popped" one or more of the diodes in either the KPA100 or
> the KAT100 wattmeter, but the answers to the above questions will
> indicate where to look next.
>
>
>    
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