[GreenKeys] Flesher TU-170

[Tom Hunter]

I am not using my Flesher TU-170 right now, so I was able to put it on the
bench.

>From the schematic it looks like the input impedance should be about 2500
ohms .

I used tones coming from a USB sound card on one of my streaming computers
for testing .

It starts keying the loop at about .1 volt of tones. That is about 6 on my
meter.

It starts limiting at about 7 on my meter. That was such a slight
difference in input voltage that I could not see the change on the 'scope.

My guess is  that it would work fine on  a stereo system 'line level' or
any 600 ohm line level..

The tones from my tones from different computers run from .2 volts to .8
volts to 4 TU's that feed separate loops to monitor my streams. I use those
loops to test Teletypes.

By the way I have had trouble using the Flesher on one of my big loops.
When I would plug in a 28, the current meter would pin. Some day I may try
to figure out why. Right now it was easier to go back to a Heathkit
HD-3030. That is why I am not using the Flesher.

Tom N3CRK
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