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much appreciated so far....
i am getting closer to finding the problem.. i think... i think the finals are good, but not certain, after a lot of testing and checking i have had the output to go up to 40 watts out for a little but start to come down again.
i have found that the problem is most likely on the lpf board as it has had some "work" done on it... after transmitting for a very short time, 30 seconds, the filter coils for 2m get very hot, to the point of discoloring the bottom of the board... got one blocking cap that is acting strange and found the pin diode to be cracked and has a hole in it. interesting that it still lets any rf through... will know more when the new parts get here..
i already have ordered the stack of three for the fet but haven't changed them yet.
thankskevin ki4nbo
On Saturday, February 24, 2018, 10:23:20 PM EST, 'Eric van de Weyer' [email protected] [FT100] <[email protected]> wrote:
Hi Kevin,
I have had similar problems with the V/U finals many years ago and found the cause to be faulty capacitors in the stack of capacitors in the final amplifier. There is a stack of chip capacitors between the drain leads of the output pair of FETs.
Of course, your problem may be different. Obviously, as you are getting output on 2m, the FETs are probably still OK.
73….Eric VK2VE
From: [email protected] [mailto:[email protected]]
Sent: Monday, 19 February 2018 12:44
To: [email protected]
Subject: [FT100] vhf/uhf output
anyone ever experienced lower than usual output on 2m and no output on 440?
rig indicates 20w on 440 with nothing measured on external meter..
2m indicates 50w on the rig with 20-30w measured on external meter...
would a bad final module put out around 30w if it was bad?
thanks
kevin ki4nbo
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