Where do I look to find what PLL and board I have in my Cobra 25 ltd classic?
Thanks
Thanks
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PLL
- Thread starter Oldtimer
- Start date
It's probably a TC9106...
... but, many 25's had lots of hard "goo" or or a sealed "can" around the PLL. Still probably a TC9106 if you can't see it directly.
From Lou Franklin's "The PLL Data Book":
TC9106 (US)
TC9119 (UK)
(Toshiba)
Vdd 1 18 Vss
RI 2 17 P7
CL*** 3 16 P6
LD* 4 15 P5
PD 5 14 P4
AI 6 13 P3
AO 7 12 P2
T/R* 8 11 P1
Fin 9 10 P0
*1 = Locked, 0 = Unlocked
**T = 1, R = 0
***Tied to ground by a capacitor, which determines the time constant for LD pin.
The beginning of the impossible chips! Uses double-ROM set which protects against illegal programming and also allows compatibility with 8-bit rotary LED Channel Selector. Chips use direct division of a 16 MHz VCO, 5 KHz steps, and the only difference between them is the ROM N-codes needed to divide down the different US/UK VCO frequencies.
{Pretty Much} Impossible to modify!
... but, many 25's had lots of hard "goo" or or a sealed "can" around the PLL. Still probably a TC9106 if you can't see it directly.
From Lou Franklin's "The PLL Data Book":
TC9106 (US)
TC9119 (UK)
(Toshiba)
Vdd 1 18 Vss
RI 2 17 P7
CL*** 3 16 P6
LD* 4 15 P5
PD 5 14 P4
AI 6 13 P3
AO 7 12 P2
T/R* 8 11 P1
Fin 9 10 P0
*1 = Locked, 0 = Unlocked
**T = 1, R = 0
***Tied to ground by a capacitor, which determines the time constant for LD pin.
The beginning of the impossible chips! Uses double-ROM set which protects against illegal programming and also allows compatibility with 8-bit rotary LED Channel Selector. Chips use direct division of a 16 MHz VCO, 5 KHz steps, and the only difference between them is the ROM N-codes needed to divide down the different US/UK VCO frequencies.
{Pretty Much} Impossible to modify!