Search results

Would anyone know if there is a post or write up on a channel mod for the mb8719 and mb8734 radios replacing it with a MC145106P pll I know the MC145106p chip you can get more channels out of it than the mb8719 plls. I have seen an actual kit you just plug into the removed 8719 and replaced...

nomadradio I tried to pin point the Mark4A schematic on where you say it uses npn transistor to provide ground to the crystals. I only found the 10.240 crystal to pin 4 on the pll. Could not find anything else, I used the schematic on cbtricks not the best. thanks

The crystals are 11.4758 and 11.1758 just need 11.3758 to 11.5758 and the 11.0758 to 11.2758. If you trim the cap im using the yellow 30pf seems to work best to try to get close to a 1kc up or down the xtal will stop, turn trim cap back and it will show frequency. I can trim xtals to center...

I did try the Lou franklins setup and does work I used exact parts and it would switch from xtal 1 to xtal 2 when 12v applied. I used 1n4148 diodes. What happens is the trim pot gives out when adjusting it. I tried different value trim pots like green- red -brown and same results. Not enough...

Wondering if some on the forum has made a 3 position or more crystal switch. Looking to do this with transistors. I tried a circuit and did not work Ill post the picture of what I tried. I don't need an oscillator just something to switch in 3 crystals 4 xtals the most. I tried the below and...

Thanks nomadradio for the info on the silver mica caps

what can be used to replace a silver mica cap? Anything special about silver mica caps

thanks for the reply. I have a bunch of these and will try a ceramic cap. Was just on ebay looking for these silver mica caps they are crazy priced $32.00 for 2 and other crazy prices for other silver mica caps. Why such a high price?

What type is the C# 56pf cap in the picture the big brown one. Can a regular 56pf ceramic disc work? I know its an old thread

Think I posted a picture of one with the black epoxy over the pll but would be nice to see yours. thanks

Hi Nomadradio. Thanks for that info on the 150 for channels. Is there directions to add in the two CD4008/MC14008 4-bit adder chips/ Also for the wiring. Or just the pins on the chip/pll to add channels. I have someone wanting channels in the radio but if it still involves trying to remove the...

it has the MC-145106 PLL

its hard epoxy and im sure board damage would happen. The pll is programmable what im also looking for it a picture of the bottom side to see if epoxy is on bottom also. I guess the fcc would not let them sell radio in USA so the get around was to encase the pll with the epoxy

you can get at the pll but its encased with epoxy

Are there any mods for these radios that have the pll encased in black epoxy? Someone has one and wants extra channels. here is a picture of the pll in black epoxy, has anyone attempted to do extra channels or has some info on doing this. thanks

Thanks for the info guys

Who makes RoadKing RK-CB radios? Are there schematics for them? Are they similar to other made radios circuit wise? Looked on cbtricks and no info that I could find. thanks

Sonoma what did the Galaxy kits consist of was it a pll mod or crystal swap? I know this post is old got nothing else to do but read.

yes for the small expo 100 a board is there any board files so I can build one?

Ok thanks for that info would anyone have a part# and source for these brackets to mount a pc board on the side of a radio?