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23 ch 02a channel mod
- Thread starter Staybolt
- Start date
That chip was used in a variety of 23-channel radios. They were not all based on the same binary arithmetic.
Identifying the starting point is the first step before deciding what to change.
73
Identifying the starting point is the first step before deciding what to change.
73
Actually there's a mod for lots of different radios that used this chip. It was popular with more than one factory. The tricky part is which mod works for your radio? Starts with knowing which radio model.
Needless to say, different factories chose different setups for this chip. The binary number that comes from the channel selector into the PLL chip will be different for different years' production circuits.
Simple AM radios used this chip with three quartz crystals in the radio, total. This seemed like a big savings compared 14 crystals or more in a 23-channel conventional CB.
Later they figured out how to do it with only two crystals. Needless to say, the internal arithmetic for the 3-crystal radio is not the same as in the two-crystal PLL circuit.
The exact change to be made for a chosen frequency range depends totally on those seemingly-arbitrary differences in the binary arithmetic that you modify to add channels.
So, is this about a particular model? Or just a wish that one 'universal' mod would work no matter which radio?
Ain't none of them.
73
What Radio is it?
That is the question.
Just asking for a mod for a PLL 02a has more than one answer because that chip is used in different ways in different radios.
This is what Chris is asking.
73
Jeff
That is the question.
Just asking for a mod for a PLL 02a has more than one answer because that chip is used in different ways in different radios.
This is what Chris is asking.
73
Jeff
Cybernet used three main configurations (there may be more) for the 02a chip.
AM 3 crystal, with PLL N-codes starting at 224 for channel 1 and going up to 253 (23 channel) or 268 (40 channel).
AM 2 crystal, with PLL N-codes starting at 330 for channel 1 and going down to 286 for channel 40.
SSB, with PLL N-codes starting at 255 for channel 1 and going down to 211 for channel 40.
So that's a completely different mod for each of them if you intend to put switches on the PLL programming lines because in each case the N-codes to get lowers are going to be different.
Say you wanted to put your radio on 26.815 MHz. For the AM 3 crystal chassis, you'll need to feed the PLL an N-code of 209. For the AM 2 crystal chassis, it would be an N-code of 345. For the SSB chassis it would be an N-code of 270.
This is why no one can provide you the answer you're looking for without knowing which radio you intend to modify.
AM 3 crystal, with PLL N-codes starting at 224 for channel 1 and going up to 253 (23 channel) or 268 (40 channel).
AM 2 crystal, with PLL N-codes starting at 330 for channel 1 and going down to 286 for channel 40.
SSB, with PLL N-codes starting at 255 for channel 1 and going down to 211 for channel 40.
So that's a completely different mod for each of them if you intend to put switches on the PLL programming lines because in each case the N-codes to get lowers are going to be different.
Say you wanted to put your radio on 26.815 MHz. For the AM 3 crystal chassis, you'll need to feed the PLL an N-code of 209. For the AM 2 crystal chassis, it would be an N-code of 345. For the SSB chassis it would be an N-code of 270.
This is why no one can provide you the answer you're looking for without knowing which radio you intend to modify.
I believe thats a ptbm039aox
(PDF) 23 channel PLL02A mods Simple mod for lower channelssm5nvc.se/erak/mod/10m/HYGAIN/plowboy23.pdf · 23 channel PLL02A mods Simple mod for lower channels The radio shown in both mods - DOKUMEN.TIPS
23 channel PLL02A mods Simple mod for lower channels The radio shown in both mods on this page is different from 40 channel radios with PLL02A chip, these mods should only…
dokumen.tips
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2330B
According to RIGPIX, PTBM033AOX or PTBM039AOX by Cybernet Electronics Corporation
CB-116 (April 1977)
According to RIGPIX, PTBM033AOX or PTBM039AOX by Cybernet Electronics Corporation
CB-116 (April 1977)
RadioMods PLL02A add-on Manual Page
The online manual for the PLL02A Eprom frequency converion board, allowing more bands including UK, NZ and a 10KHz shift, as well as another band above and below existing channels.
www.radiomods.co.nz
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