The Defpom Forum, for RadioMods, S&M Software and Music by The Defpom

G'day all,
I have just bought an old SBE (LINER badged) Console-V base station radio.
It is an Australian 18 channel version and i would really love to get it running on the 40 channel band.
Any CB radios i have converted from the Aussie 18 channels to the now used 40 channels have been the usual cybernet type chassis that uses the channel selector to alter the BCD for channel programming.
Simple, remove 18 channel switch, re-fit new 40 channel switch. Job done.

My problem is this radio's channel selector seems to be a simple up/down rotary switch, and all the BCD info must be handled by one of the many chips used in this strange (to me) PLL.

Does anyone here know what the difference is between 18 channel and 40 channel versions of this radio?
If not, maybe someone with experience modifying this radio for '10 meter band use' might be able to explain things a little for me so i get an understanding of how this works, then i can work it out myself?

Ultimately, i just want the radio to select and display the normal 40 channels thereby retaining the factory look of the radio.
I have a full call ham licence, so no need to use this one on 10mtrs.
But an explanation, of out of band mods, might help me understand the way this particular PLL system works.

Any help or info on this would be VERY greatly appreciated, as so far i have not had much luck finding anything about these rigs.

The early chassis used 4 IC?s to makeup the PLL, IC901 (MC14568) that is a phase comparator and programmable counter, IC902 (MC14526) that is a 4-bit ? N counter, IC903 that is a Divider ? 10, IC904 that is a Divider ? 2. If you can let me have your e-mail address vir a PM I send what info I have no this radio.

Rick.

PM sent Rick, Thanks

And thanks for the info above.
I just cant fathom (at this stage) how my model only selects 18 channels, but i suspect IC803, and its 7 outputs to the PLL dictates how many channels are selectable much like a normal channel selector switch would in a cybernet rig?
But how i can change this to get 40 channels instead of 18 has me puzzled

hi there,just checking out pic of your radio.this is a real nice looking rig.and youve got the right guy helping you here.he can point you in the right direction,no doubt...........ramblinman

Thanks ramblingman. It is a nice radio in a cool/retro kind of way, and one i hadn't come across till now, so I bought it as an educational project for myself

Rick, i have sent the truth chart to you with the N-codes as measured on my 18ch radio.
Thanks a million mate

I'm very curious about what that IC803 does.
Everything i have read about the PLL IC's in this radio Say's that the NDC40013(M58476) PLL is the later chip used to replace the earlier MC14568/MC14526 pair.
This radio has all the above in it!

All great fun

*bUmP*

Im still confused over this radio having all these (3 pll IC) chips yet only 18 channels.

Anybody have some clues for me to make it select 40 channels?

I had one of there rig some 20 + years ago. I had it converted to 160 channel by Rick.

Ok, further goofing around with this radio has not got me very far, but i have learnt a little bit more about what makes it tick....

IC-803 in the channel up/down unit, although sharing the name of another PLL (M58476) is totally unlike its name sake.
The M58476 in this rig has 24 pins (Not 16), and outputs 'N'code to both the PLL (7bits) and the LED display (via a pair of 7447 drivers)
So my guess was right, IC-803 works the same as a channel selector in rigs like a cybernet PLL02A chassis determining the program codes being sent to the PLL but the ROM written on the M58476 only seems to allow code for 18 channels to be output to the display drivers and PLL unit.
This radio's channel selector has only 3 outputs.
UP-DOWN and RESET.
I was wanting to use an EPROM to expand the 18 channels to at least 40 but am now stuck trying to devise a way of using the simple up/down rotary channel selector in the rig with an EPROM and have the channel display read out the correct numbers also.
I could use a channel selector out of another rig type, and possibly drive the display off it, but would loose functions like channel 5 (9USA) recall and the scan functions it has now.
So my question is, does anyone know how i could get an EPROM to scroll through its contents AND drive the channel display, all while using the simple UP/DOWN rotary switch??

Hopelessly stuck...............

PS:Image below shows pinouts for IC-803, The M58476 chip mentioned above, and its functions?

You would need a bunch of CMOS devices like CD4029B, CD4078B, CD4093B, and CD4511B to do the logic and Op-Amp to do the up/down switching.

Rick.