[ARC5] T-22 Woes

[brianclarke01 at optusnet.com.au]

	Hello Mark, 

	Valuable lesson you've gained there. 

	Another valuable lesson from a colleague of mine - wind on even more
turn of insulated wire at the cold end of the PA tank coil and you can
get a very close match to 50 Ohm. If you do find and fit the varaible
transformer link, put these additional turns in series so you can
still use the roller inductor for fine tuning / matching to your
antenna and feedline. 

	The beauty of this mod is that it is totally reversible and leaves no
witnesses. 

	73 de Brian, VK2GCE. 

OnThu, 13 Jun 2013 08:37:35 -0400, Mark said:

I’m not going to have very much time for radios until maybe Friday
night at
the earliest, so while I was lying in bed last night I decided to get
up
early this morning to get in some radio time before work and see if
T-54B
was indeed the culprit.

I wound a few turns of hookup wire over the base of T54 to simulate a
max
coupled condition and was delighted to see about 15W of output on the
wattmeter! Adjusting the roller inductor peaked the output to a little
over 20W – that’s running about 350V or so on the plates through a
67 pF
coupling capacitor then through the 4:1 UNUN.

WhooooHoooooo!! There be power there!!

This was a toughie for me, and was a great experience to really dive
into
the innards of the T-22. I’m going to keep my eyes peeled for a
replacement transformer. A buddy in Texas recently decided to get out
of
the mil radio aspect of our hobby and sold me most of his stuff at a
good
buddy price, and there are a few bags of parts in those boxes. I know
I
saw a transformer in there, but I didn’t check to see if it was for
a T-22.

Thanks for your help and comments guys – it’s great to have you
guys on
here to help out and offer suggestions!

73

Mark K3MSB

Sent from my Android phone

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