Originally Posted by elrod
I'm sorry- I'm so used to everyone know what I know and I didn't mean to take that for granted here. Here is the O2A Chip and its MOD
PLL 02A MODS
aka the 'PLL Chip' that gives you the Channels 1-40 in circuit with a Crystal at times. The Radio being Sears Roadtalker also has a PLL chip but was deemed unmodifiable. (so we saw a Similarity to the O2A Chip) In most chips there are Legs that lead nowhere on the board expect to solder. Then others that is circuit is cut from connections will change the overall Frequency. Other legs if Voltage is added or put to ground will do the same.
Then other leads attached to others will also alter it's Frequency and makes certain Legs 'live'.
This is where the Cutting, Grounding, Adding etc to the PLL Chip's Traces makes world of difference. You may be wondering why they are like this.
The reason being is the chips were muti-purpose for 'export' Radio and 10 meter Hams. Which instead of 26.995-27.405 We are looking at 28.0000 to 29.9999 or 24.0000 to 32.0000mhz
Those will have 'BAND Switch. A,B,C,D,E,F etc They have a already wired , single rotary switch. Sadly when you MOD your CB- you end up with several ugly switches instead.
The frequency is limited by the Radio's bandwidth too. I NEVER in my entire life-ever-ever MODDED a CB to go below 26.5** Mhz til is cut out 100%. I wonder how HIGH the Radio will go too? (Since I was unable to finish the MOD) One rule that is generally true is SSB Radio seem to be able to get More than 40 channels above and below before it cuts out. Well- I hope this does answers the Huh? question. :-)