Or did you mean Channel 3.... which is 26.985?
The reason I pick THAT one is 26.985 - 26.527 is 458 KHz.....which is VERY CLOSE to the 455 KHz IF .
That would sound to me like there is a TX/RF shift in the PLL/VCO that is either "stuck on" or "doesn't work at all"..... so you are 455 KHz DOWN from where you should be.
Do you have another radio that you can key on....and see what channel you are receiving on? Like set the other on channel 3 and key it....and make sure THIS radio hears it on the right channel.
Since it is down shifting on transmit... you may want to test on a higher Channel 23 or 40 so that you have some room to drop if you have to go find it.
Then it would in every mode, not just AM. I'm thinking there is a bad solder joint in the AM path to the pllI used my Kenwood TS 940S to receive and that is the frequency that it was broadcasting on. I’m thinking IC3 the “phase lock Loop” PLL is malfunctioning...
English please.... There’s a lot going on here....lolBoy - I gotta buy you guys a beer sometime ...
My only input I can provide is to check and verify that J14 is properly aligned and SEATED - else D85/D86 D87 steering diode mess to route the proper Switch toggling to make sure AM is being detected as the mode it is in.
IF the PLL doesn't see that RX/TX switch - the 8719 is thinking it's something else.
So to me this is related to the VCO side that AM mode plus TX mode - needs to RF switch-in a cap to change the IF (Revert) frequency to kill the 455kHz IF 2nd IF. Thats on the RX line...you get RX so that rules that out.
D97 and D98 turn on the Q47 IF stuff for TX - so if TX mode isn't turning on in AM - steering diodes may be the culprit.
Thanks a lot I appreciate the information, I will check those components tonight.This is a DX949, but it's the same board. I highlighted the parts that H.A. mentioned so you'll know were to look. View attachment 43492
Oh, sorry for the "Buy you guys a Beer" moment...
View attachment 43499
I was referring to Non-Alcoholic
Another thing to note that could possibly be connected with this problem. When I connect my frequency counter or oscilloscope to TP 5 to check the frequency I get nothing unless I unhook the ground on the probe then the frequency bounces around all over the place but nowhere close to where it is supposed to be. My equipment is going through an isolation transformer and the radio is being powered off of a battery.This is a DX949, but it's the same board. I highlighted the parts that H.A. mentioned so you'll know were to look. View attachment 43492
Maybe that points to a possible short somewhere.Another thing to note that could possibly be connected with this problem. When I connect my frequency counter or oscilloscope to TP 5 to check the frequency I get nothing unless I unhook the ground on the probe then the frequency bounces around all over the place but nowhere close to where it is supposed to be. My equipment is going through an isolation transformer and the radio is being powered off of a battery.