[Drake] TR-7 Receiver Noise Question

[Larry Taft]

Jim,
A possible source of the noise is the 10 volt adjustment pot on the power 
supply board.  Pull the top cover of the TR-7 and lightly tap on the 
right-most pot on the PS board located on the right side just behind the 
front panel.  Do NOT give it a twist as that will then introduce you to the 
alignment process for the rig.
73,  Larry  K2LT
drakerepair.com
800-687-9161

At 07:26 AM 3/28/2004 -0500, you wrote:

>Hi All:
>
>My TR-7 exhibits a low level background noise that sounds similar to random
>atmospheric static.  The noise comes from inside the radio.  It's audible
>when a dummy load is connected, the RF gain is turned down and there's no
>external noise to mask it.  It's most noticeable (to the point of being
>extremely annoying) when using the 500 Hz CW filter; it's also present when
>using the other filters, but it's almost inaudible and isn't a problem with
>other modes.  It's independent of the audio gain control, so that's a clue
>as to where to start looking for the noise source.  Before I dig in, has
>anyone heard of this before?
>
>Thanx & 73,
>Jim
>WA2MER
>
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