The CB Forum > How CB radio works
Understanding how CB radio works
The Radio Shop:
Thanks bro. Will get back to this one day lol.
kopcicle:
Maybe I remember this ...
the 10.240mhz is divided two different ways
by 1024 to get the 10khz channel spacing and by 2 to get 5.12mhz that is then tripled for 15.360
So ...
.91+ 15.360 + 10.695 = 26.965mhz
The difference between 10.695 and 10.240 is 455khz which "kinda" explains the receive .
nifty little bit of engineering save for the Tc9106 rom locked pos .
This is for the classic Uniden 25/29 LTD mix
I spent just short of 20 seconds in a recent 29 before turning it into a door stop ....
~kop
The Radio Shop:
Sounds like you are on it just fine.
Door stop eh? Not to hard of a radio to work on. just don't work on them as much as I used to.
kopcicle:
was meaning to say that the recent "soundtracker" scheme was a disaster ...
I have another for you .
am lsb usb
n 113 113 113
3xF0 (MHZ) 33.8575 33.8525 33.8578
Nx10khz (MHZ) 1.13 1.13 1.13
Fl (MHZ) 34.9875 34.9825 34.9875
Fif (MHZ) 7.8025 7.7975 7.8025
Ft (MHZ) 27.185 27.185 27.185
What if ...
F0 (MHZ) 11.285833333 11.284166667 11.285933333
Nx10khz (MHZ) 1.13 1.13 1.13
Fl (MHZ) 12.415833333 12.414166667 34.9875
Fif (MHZ) 7.8025 7.7975 7.8025
Ft (MHZ) 4.613333333 4.616666667 4.613333333
(if -1.13 MHZ) 3.483333333 3.486666667 3.483333333
@ 3.48mhz with at least a decade of count (1.13 MHZ)left going down this would allow 80m coverage :-)
Admittedly the 10khz channel spacing is a kludge and the receive audio isn't the best but the lot of the UPD858 SSB chassis are known to be stable frequency wise and have terrific transmit audio .
Yes it would require a complete re-tune of the if and rf but the transformers are still available in the form factor necessary .
I may be full of static but the thought passed and I had to share ...
~kop
Shadetree Mechanic:
Great info, thanks!
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