Ok, you were taking it to the oddballs, just not going high enough.
Don't know why TR41 would be a problem - but if it TX'd ok earlier, the issue of not TX'ing in the uppers towards the 10M band is a bandwidth problem. It's dealing with and around the PLL as a frequency issue, not a driver and final.
Ok, you are aware (right?) that there are more than one Xtal in this radio and you still haven't told me the year or origin, a board number does help, but only with the schematic and route, but NOT THE REVEISED PART LIST AND CHANGES MADE TO THE PARTS AS SUBSTITUTION AND UPGRADE...
The PLL uses X2 one series uses a 24MHz Xtal, - latter uses 10.240 - what year do you have...Knowing Origin does help me as Philippines or Malasia or other...because you are messing with upper limits - it could help in getting your PLL locked in...Hint NEC/TOSHIBA/RCI - all can use X2 as the 10.240 but not all can use the 24MHz one!
When the PLL mixes it's own frequency with the IF (UHIC 007 side, not audio IF) - it looks at a window above 33MHz, and gets the image - then subtracts it using inversion (reversion is less applicable) or subtraction to restore the 27MHz signal - so you're trying to go way above, it's not in the cards the radio was designed for. It takes it up nearly past 36 MHz - there's an upper limit to this process before you lose the ability to keep the signal locked, and maintain some sense of a channel bandplan - for the multiplier ADDS to the error rate - lessens the accuracy of the PLL tracking the whole mess.
So you're seeing an upper limit on the frequency as to why the thing won't TX.
:+> Andy <+:
