Paragon AGC / RF Gain / Audio Stage Mods

From the Ten-Tec Reflector December 26, 2002

Here are some mods that I just put into my Paragon (I):

If slow AGC is too fast for you, pull the IF/AF board and change C46 from 10 uf to 22 uf. Fast AGC is unaffected. If 22 uf makes it too slow, try 16 uf. I'm trying 22 uf, for now.

My RF gain control has always been touchy: Crank it back below 12 o'clock and the signal level abruptly drops to nil. Here's a fix to improve it: On the IF/AF board, change R47 from 4.7 k to 10 k. Also on the POT board connect a 22 k resistor from the high voltage side of the RF gain POT to the wiper.

If you Paragon audio stage oscillates when using the internal speaker, check connector 57 on the sidetone board for a poor connection on the shield ground. Make sure the shield is tight in the plug, and check the socket for tarnish I put a little De-oxit on the connector pins and mated and unmated the connector several times to wipe the contacts clean.

If you ever remove the sidetone board, make sure that you don't forget the plastic shoulder washers that insulate it from the chassis. If toy ground the board, it will cause a ground loop resulting in audio hum.

73,

Bob WB2VUF