DX959 Clarifier Won't Unlock

I have done numerous clarifier unlocks on the 959's and have not ever used the jumper from J6 ........
It seems you may not have connected the jumper from the +8 volts to the correct J9 F1 pin.
And a frequency alignment is required after this modification using a high quality frequency counter.

9two7 said:

Thanks for the reply! I suspect that the 8V which is silk-screened @ J6 is not the 8V source I was supposed to tap into. Looks like the 8V @ J14 is the one which is referenced in the instructions. Will check again and report back

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IMHO, a better way is to find a stable constant voltage source that is higher than the stock RX voltage going to the high side of the clarifier. Simply install a 10 turn trimmer pot in series and dial down the voltage until it is "on frequency". No re-alignment necessary. If you can't find a constant voltage source that is higher than the stock RX voltage, you can easily make one. Just mount a LM7809 on the side/back of the radio (heatsink) and a diode and a couple of caps will give you a nice, stable 9v source. Use the 10 turn trimmer to bring the voltage down.

https://circuits-diy.com/9v-power-supply-using-lm7809-voltage-regulator-ic/

This also allows you to "true up" your clarifier if it was off a bit.

FYI - I find that taking 8v off one of the IC's in the radio many times isn't stable enough and can cause a slight shift between RX/TX. Using the LM7809, it is eliminated.

Just my .02
Dr_DX

From Lazarus, CB Tricks era - bless his heart...

Handy Andy said:

From Lazarus, CB Tricks era - bless his heart...

View attachment 44417
This is for a 98VHP - but the CONCEPT is the same,
Break the 8 V PLL RX/TX tie-in R113, and the TX power D68...

View attachment 44418​

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Heck yeah, a blast from the past! Does anyone know if he's alive and well? Somewhere I've got a few printed threads from cbt where he helped me iron out some issues back then. Laz and cbt, talk about a throw back.