[Drake] TR4C weak audio and poor sensitivity (Dick KF4NS)

[Dick KF4NS]

Hi Gary,
My question now is which one is the LSB filter? Looking at the switch 
on the schematic is even more confusing. It looks like the switch 
contacts are all making but it may be just a poor printout of the 
schematic. Both filters are shown as 9mhz and the inputs are always 
tied together and at DC ground. Total confusion here!

I will check the contacts in the K2 relay.
Thanks and 73, Dick KF4NS
St Petersburg, FL 33714 USA
Keep The Glow!

----- Original Message ----- 
From: "Gary Poland" <gpoland1 at cinci.rr.com>
To: "Dick KF4NS" <kf4nsradio at verizon.net>
Sent: Wednesday, June 16, 2010 9:19 PM
Subject: Re: [Drake] TR4C crystal ID


<<SNIP>>
    By the way I read your post about the weak audio. Check that your 
9 mhz
> carrier oscillator is close to 9.0 mhz. Also check the contacts on 
> K2, the single pole relay near the 9 mhz crystal. If K2's contacts 
> are dirty the 9 mhz oscillator wil be shifted about 1 khz all the 
> time instead of just in CW and AM xmit.
>    TR-4's are notorious for bad LSB sideband filters, I have a pile 
> of bad ones here. The LSB filter is used for LSB on 80 meters and 
> USB on 20 meters.
>
> 73, Gary
>
> http://home.roadrunner.com/~w8pu/
>