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Uniden 980 SSB - crowdsource the frequency mod?

Just a heads up, I have a way to get 40 channels up on the radio now, thru a crystal swap. My radio is capable of 27.415 - 27.855. When I get time, I'm going to look into things further and see if there are other methods of achieving extras. Will post info as soon as I can. But for now, this is promising. :)



~Cheers~
 
That won't happen unless the D78F0483 microprocessor chip is removed, and a new one is reprogrammed and resoldered in its place. It's only programmed to read 26.965 ~ 27.405. You can't reprogram the existing chip, it'll burn out. To make matters worse, it requires special software and hardware to program. Went thru the datasheet for it, all 203 pages of it. Yikes. Not worth it, IMO. A good old hand-written "roadmap" will have to do for a while. :LOL:


~Cheers~
 
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Could always come up with an EXPO kit with the crystals needed for the upper/lower 40 channels.
 
Ok, did some more digging into the radio.

The only way to get channels is thru a crystal swap. I studied the datasheet for the PLL they use, and what they're doing is using seperate VCOs for the TX and RX, now you can insert a reference divider on the output pin(s), but there's an output pin for both TX AND RX. That being said, you'd need 2 reference dividers, and at that, you'd have to make sure the TX output and the RX output match. In some radios, they do not match (like the 455khz T/R shift in a Cobra 29 LTD for example), therefore putting 2 reference dividers will not work. Next week I plan on ordering 2 crystals from Jan Crystals, 1 crystal @ 10.6917Mhz for 40 up, and 1 crystal @ 9.7917Mhz for 40 down. I'll see if I can switch out the crystals with diode or relay switching, so perhaps I won't need to make an oscillator to amplify the output of each crystal. Will post new info when I can. :)


~Cheers~
 
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