[Premium-Rx] RA 6830 Post IF filter

[Carcia, Frank A. HS]

>  	Hi ,
> 	I did a cool modification to the hot rod 6830. I put a mechanical
> filter module
> 	in the A8 slot. I cut 5 mother board traces under the ribbon cable
> to isolate
> 	pins A 25 through A29 the filter select lines at A8. Then I ran 5
> jumpers
> 	to A10 for the select lines. I had to lift 1 resistor on the module
> that forces the
> 	output transistor on all the time. I just lifted 1 end and moved it
> about 2/10 
> 	of an inch to a local ground. This addition did not change any
> receiver
> 	mds performance but made it sharper and reduced background noise.
> 	Bite failed step 36 (6803) so I needed to turn R21 on A7 a few turns
> 	CCW to bring the level back up. Coax cables had to be routed in and
> out.
> 	Cable to J1 hits the side panel guide going in so be careful
> installing it.
> 	I cracked J1 because I didn't notice the problem. P1 just has to be
> rotated
> 	so flat side faces the guide. I now have 3 filter modules in the
> radio and
> 	the CW filter is 900 Hz wide at the noise floor.  6 KHz position
> still sounds
> 	OK on AM but skirts are quite sharp. I have always felt there was a
> bit too 
> 	much gain A9 to A7 and took advantage of it.    fc