"Floyd Sense" <[EMAIL PROTECTED]> made an utterance to the drakelist gang
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Makes sense. I have around 60 high-end BC/SW radios from the late 1930s and
most of them have the on/off switch on a control other than the volume
control (tone control for example). Anyway, I feed my audio through an
external DSP unit which is used to control the volume and can run it down to
zero that way.
73, Floyd - K8AC
----- Original Message -----
From: "Garey Barrell" <[EMAIL PROTECTED]>
To: "Floyd Sense" <[EMAIL PROTECTED]>
Cc: "drake" <[email protected]>
Sent: Tuesday, November 01, 2005 10:44 PM
Subject: Re: [drakelist] TR7 AF gain control
Floyd -
Well, a lot of answers, but no one seems to have come up with the "real"
reason the AF gain on the TR-7 doesn't turn the audio completely off.
No big plot to prevent the ops from turning the audio down "accidently" so
they can sleep, no quirk of solid state, or any of the other reasons that
have appeared over the years.
The reason, plain and simple, is that the ON-OFF switch mechanism has to
have travel room to operate the switch. Result? You can't turn the pot
all the way to zero without turning the radio OFF! Any radio that has
the On-Off switch on the AF Gain control has the same problem, depending
upon how much AF gain is after the volume control. This is why most
receivers/transceivers have the power switch on a Function switch, or
sometimes on the RF Gain control. Easiest way to kill the audio is to
back off on the RF Gain control by grabbing both concentric knobs together
as you turn it down.
When the unobtainium AC power switch on the TR-7 dies, (which they all do
if you use them enough,) and you wire across it and use an external power
strip or other external switch, (like you shoulda been doing all along,)
THEN you will be able to turn the AF Gain all the way down. If that
"click" at the end bothers you, you can take out the switch actuator!
73, Garey - K4OAH
Atlanta
Drake C-Line Service Manual
<http://www.k4oah.com>
Floyd Sense wrote:
"Floyd Sense" <[EMAIL PROTECTED]> made an utterance to the drakelist
gang
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Finally got around to listening to my newly acquired TR7, and notice that
setting the AF gain control to minimum does not reduce the AF output to
zero. Haven't dug into it yet, but wonder if this is a common problem in
the TR7? Not likely a pot problem since it adjusts very smoothly down to
the minimum, but just doesn't reduce the output to zero.
K8AC
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