president richard kc shift

[andrew013]

right i have a richard that is a pb010ac cobra148 gtl dx mk2 clone or what ever you want to call it ,
now thinking it should work like a cobra 148, it dosent as its only got a 2 to 3 kc swing + - like the grant pc999ae boarded radios on the coarse shift
so question is can/has anyone got one that was modded like the grant to swing to zero or actually go the full 5 /6 kc`s on the coarse now i think i have a scrap mk2 cobra board somewhere and could check a few components if i can find it (not sure if i binned it)
any help or info would be most welcome cheers

[Otter]

Maybe someone has changed the main crystal in your Richard. I'm pretty sure mine does +/- 5-6 kc

[andrew013]

Maybe someone has changed the main crystal in your Richard. I'm pretty sure mine does +/- 5-6 kc

just checked its a 15.000 thanks for that idea

[cb4ever104]

Mine also does 5/6khz each way . Might be worthwhile trying to swap your crystal for one from another radio , Maybe it's "Q" is a bit more rigid than it should be . At least I think it's the Q factor . Better go check on Google ... If it's not that then it might be the varicap diode .

Sammy

[Otter]

Maybe someone has changed the main crystal in your Richard. I'm pretty sure mine does +/- 5-6 kc

just checked its a 15.000 thanks for that idea

Is it marked "UNI" on it? a 15 MHz generic crystal is different.

[andrew013]

xtal says uni and thought about varicap as well , if i can find this board i have i will swop a few parts around and see what that does , tho i have a feeling i may have thrown out the board , why else would i need it right now lol, keep stuff for years , get rid and a few weeks later boom

[cb4ever104]

Doesn't need to be the same board . Any EPT36 SS3900 , or similar board will do . Start with the voltages and resistance on the COARSE control and work from there .

Sammy

[163TM847]

Check there isnt a resistor added solder side near the 15.000 xtal, Sometimes one is added and coils retuned so coarse dont swing much

[andrew013]

thanks for all the ideas sorry for late response , nick the only resistor on the solder side is at the rear and has been disconected one side poss power mod for france perhaps any way not using the radio now so giving up on it for awhile

[Mojo666]

Just found this on the secret CB volumes via CB RADIO MAGAZINE website. It works absolutely spot on.

IMG_8523.PNG

I skipped 1-3 and just put a jumper over R232 I now get plenty of slide on the clarifier.
Very happy.