[Elecraft] #4472 transmitter setup problem.

[jerry]

Found the culprit on hi current,   I had my textronix scope on the output of the K2,  I was doing the xmitter alighment and tweaking the L1 thur L13 cans and left the scope on the output.  It's a 10meg input, don't know why?  I guess it was loading it down??   Will look into it later, I dont' think it should do that. 

I disconnected everything and set it up on the work bench to check for bad solder and such and looked at T1 -T3 , they were ok ( i had the torroid guy make them for me)  when i  hooked the K2  back up, everthing worked fine  then I put the scope back on and got  the Hi-current back on the upper bands.

Anyway,    now I adjusted the power out on all band to just shy of hi current( about 2.43ma on the display) and my power out is...
	80 meter = 14.8,   40 meter = 14.8,   30 meter = 13.8,   40 meter = 14.8,   17 meter = 12.6,   15 meter =  11.0,  12 meter = 10,  and 10 meter = 9.4 .

I assume that is ok on all.    

Thanks for all the quick responses  and everyone have a Happy Thanksgiving.

Jerry, n2uz
======= At 2004-11-25, 09:18:00 you wrote: =======

>Jerry,
>
>The variation in power when holding TUNE is not unexpected - it is due to 
>the transmit ALC settling out.  Yes, the power out is just what the display 
>says, but it will settle down after several presses of the button.  Not 
>something to be concerned about.  In normal operation, the power out will 
>settle down after an initial dash (or about 3 dots) - the ALC resets after a 
>power request change or after a band change.
>
>The real concern should be the low power output and the HI CUR indications.
>Check T1, T2 and T4 carefully for the correct number of turns.  The 
>secondary winding on T1 and T2 should look just like the diagram in the 
>manual - this is especially true for T2.  Also, T2 should be mounted a bit 
>above the board for best performance on the higher bands - 1/16 to 1/8 inch 
>is fine, and yes the leads will support it just fine.
>
>If you continue to get HI CUR indications, also check the Low Pass Filter - 
>check the capacitor values and especially the toroids for the correct number 
>of turns.  When counting turns on a toroid, remember to count the turns 
>going through the center of the core - you can easily be off by one turn if 
>you count the loops on the outside.
>
>Finally, check soldering, then recheck soldering, and when that is complete, 
>double check the soldering!!!
>
>73 and Happy Thanksgiving,
>Don W3FPR
>
>----- Original Message ----- 
>
>>I am now doing my transmitter alighment, page 75,  and have a have run into 
>>a problem with it.
>>
>> On 40 meters when I set the power to 2 watts and press and hold the tune 
>> button the power out shown is abt 2.5 on the first hold of tune,  if I do 
>> it a second time it comes up abt 2.6 and then if I do it a third time it 
>> comes up correct about 1.9.   The cycle contines, it seems that about 
>> every three times I press tune I get 1.9.
>> The same goes for 5 watts ( 5.8, 6.0 and 4.9) and 10 watts (11.2, 11.4, 
>> 9.8).
>> The currents look ok,   2 watts @ 1.28a,   5 watts @ 1.7a and 10 watts @ 
>> 2.2a (give or take a little depening on the power out.
>>
>> On 80 meters it's doing  the same.
>>
>> On 20 meters 2 watts is doing the same, but I get hi current  5 watts and 
>> above.
>>
>> On 15 meters Hi curret on  all 2, 5 and 10  watts.
>>
>> On 10 meters , the same but here I get max out of only 4.9 watts.
>>
>> The rf out looks good on a scope.        Dummy load is ok,  SWR 1:1. 
>> I've had a few cw contacts so far.    It's a basic K2.
>> Has anyone comes across and any ideas?
>>

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Best regards.				 
jerry
n2uz at comcast.net
2004-11-25