RF gain problem

[bluecurt49]

I have a connex 3300hp and the rf gain knob don't change the noise none ive changed the pot and transistor checked the resistors and it hasnt helped any ideas

[jessejamesdallas]

Is this a New radio? Someone could have added a Variable Power in place of the RF Gain and just set the RF Gain to wide open...Check your DK and see if it changes when you adjust the knob.

[MDYoungblood]

The RF gain doesn't reduce any noise just the receive signal, does the signal meter drop when you turn the knob to the left?

3's

Greg

[bluecurt49]

it does not change anything and it is an connex3300 side mic. its an old radio

[bluecurt49]

what would cause it to quit working

[sonoma]

trace the wires where they solder to the main board and verify they are making good connection. you could have a bad solder joint in the area where the wires hookup causing it not to change. get your magnifying glasses on with a solder gun and start checking for a bad solder joint. even look at the caps in that area since you said it is a old radio. you may have some of them failing. look on cbtricks.com under connex and they have a picture of the main board for active devise locations. this will also help you look at each part location. I bought a galaxy 44hml whish is a old radio on ebay for next to nothing because it did not work properly and it had bad solder joints in the vco PLL areas. works great now.

[bluecurt49]

the problem was fixed the ground wire on the switch was in the wrong place on the switch

[sonoma]

glad you found it. just takes time to trace out the wires and the locations plus bad solder joints on most radios.