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Re: TR7 low band TX oscillation
¿ªÔÆÌåÓýHello Joe, my description of the relay box was a bit vague. It's what Jim mentioned: "A less drastic solution that I have considered is adding a low voltage circuit to the PS7 to sense the TR7 power switch and turn on mains power to that big transformer with a relay." This is in fact what I did. I use 12 Volts that are fed into the
TR7 through the contacts that were used for the mains voltage
before. When the switch of the TR7 is closed, the 12 volts power a
little relay which in turn switches the mains voltage feeding the
PS7. Sounds a bit complicated but is very simple in fact. Nice
little project for a rainy Saturday. The only disadvantage is that
the 12 volts have to be there (by e. g. the usual shack power
supply or a wall wart). And you have to use a 12 volts DC fan
because the FA-7 would require the mains voltage. The good things are: - no mains in the TR7 -> safety My TR7 and R7 are both without mains inside. The R7 runs soooo
hot when used with the internal transformer. So I use externally
fed 12 volts, too. 73, Dieter DL5RDO
Am 28.11.2023 um 14:25 schrieb Joseph
K4JNG:
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