Andy,
First, let me thank you for the response.
As I go through and check voltages changing channels I am getting voltage alternately with the channel selector on the pins you state are for the channels. I don't know what channel I was on during my initial voltage checks.
pin 12 channel 20-39 @7.2V 40-19 @0V
pin 13 channel 10-19, 30-40 @7.2V 1-9, 20-29 @0V
pin 14 channel 1 @0V, 2&3 @7, goes on up alternating every 2 channels or so drops
to 0V and back to 7.2V
Seems now that I am going through the channels, all the pins on the PLL change from 0V to either 7.2V until channel 17 and 18 which go to 6.4V.
From this new info, I would say the channel selector and PLL are working as they should?
When you say to set pin 9 high, since it's at 4.59V, isn't it high? How would I go about setting it high or low? Not quite understanding this point.
I also get the following
TP3 by the RX 1st mixer FET :
16.270 in RX on CH 1, or
16.710 in RX on CH 40.
I do get the 455khz shift as you describe when keying as well.
When I key the mic, the TX light lights up, but no output. The RX light is lit when not keyed, but no audio, and no audio in the PA position, just some noise when keyed. If I key another radio near by, the meter jumps to full scale even after I un-key the adjacent radio, and seems to hang until I key up with the 25, then it drops. When I key the 25, I get no deflection on the built in meter but the TX light is on.
I might also add I have switched from the internal speaker to a external to eliminate that aspect.
I took these readings as well on 2 other IC's, the audio chip and the mixer 7310. They seem to be inline with the info from CBtricks.
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