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Post by don19488 on Jul 1, 2010 15:13:34 GMT -5
Hello,could someone advise me as to the easiest and least invasive method of lowering the dead key on my MK4s to no more than 2 watts? I want to drive my old Kenrich 500 with,it; the Kenrich is 2 20lf6s driving 5,and she does not like anything over a couple of watts,with the cost of those old 20lf6s i want to nurse them as long as possible. Tnx don19488
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Post by don19488 on Jul 8, 2010 7:48:28 GMT -5
What i found courtesy of Fixer was that the Green wire on the 5 lug conection strip had been shifted from the far right lug to the far left lug,viewed from the back of radioi put it back on far right lug and this put the resistor back in circut and dropped the dead key.Bottom line the resistor wasn't strapped like you sometimes see,but bypassed by changing position of solid green wire. Hopes this helps someone else,. don19488
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Post by Tombstone (R.I.P.) on Jul 20, 2010 16:02:07 GMT -5
Did that drop the dead key to two watts like you want? I doubt it. If everything is still factory wired you'll probably see around four watts. Detuning the final stage isn't a good idea but putting higher value power resistors might get you where you want. Leave the stock resistors in it and while the transmitter is running, you can jump lower value resistors across the factory ones until you get the watts that you want. Just be sure to use the correct voltage resistors, a little higher voltage ones won't hurt. If you do this, I'd say to retune the power stage. This is just an idea, I doubt if it will cause problems though. Other techs on this board might have a better solution. Good luck.
Tombstone
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Post by Tombstone (R.I.P.) on Jul 20, 2010 16:08:55 GMT -5
Another thought. You could eliminate one of the power resistors and replace it with a higher value of the same voltage (or a little more). then you can have variable power from as low as it will go up to the factory power output. Like I said though, I'm not sure if this method will put stress or damage anything?? Best I can think of.
Tombstone
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Post by Tombstone (R.I.P.) on Jul 20, 2010 16:11:51 GMT -5
I forgot to say to use a variable potentiometer for this, preferably a ceramic one.
Tombstone
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