MODS for the discriminator
There is a growing interest in tapping the discriminator
audio out of various scanners for decoding of a variety of signals, including
CTCSS, POCSAG, DTMF tones, RTTY, FAX, etc. By and large, such signals
cannot be take from TAPE REC jacks, headphone jacks, and EXT SPEAKER jacks
because of the voice-band filtering that is done between the signal source
and these output jacks.
Therefore, it is necessary to tap directly
to the output of the discriminator chip in your scanner. The
table below shows a list of scanners, and the discriminator
chip used in the scanner circuit.
Even if your scanner is not be listed, you may
find its discriminator chip, listed with one or more scanners below, the
pins of which will be the same for your unlisted scanner!
Discriminator Information
[AR2002] [AR3000]
[AR800] [AR900] [AR950]
[BC100XL]
[BC100XLT][BC200] [BC200XL]
[BC200XLT][BC205] [BC205XLT]
[BC2500XLT][BC350A] [BC400]
[BC400XLT][BC550XLT] [BC560]
[BC560XLT][BC700A] [BC760]
[BC760XLT][BC800XL] [BC800XLT]
[BC8500XLT][BC855XLT]
[BC890XLT] [BC950][BC950XLT]
[HX1000] [ICOMR1] [MR8100]
[MX5000] [MX7000][PRO2002]
[PRO2003] [PRO2004][PRO2005]
[PRO2006] [PRO2011][PRO2020]
[PRO2021] [PRO2022][PRO2024]
[PRO2025] [PRO2026][PRO2027]
[PRO2028] [PRO2030][PRO2035]
[PRO2042] [PRO23]
[PRO26] [PRO3032]
[PRO31] [PRO32] [PRO34]
[PRO35] [PRO36] [PRO37?]
[PRO37?] [PRO39] [PRO41]
[PRO42] [PRO43] [PRO44]
[PRO46] [PRO51]
[R1600]
[R4030] [SR001]
Some models are listed twice.
This is because of :-
a) we
were unable to get accurate information
b) the model used more than one type of
discriminator chip during its production span!
| Scanner
Receiver Type |
Discriminator
NFM IC |
Pin N° |
| HX1000, PRO2004, PRO2005, PRO2006, PRO2011, PRO2021, PRO2035,
PRO2042, PRO31, PRO32, PRO34, PRO36, PRO37?, PRO43 |
TK-10420
(some PRO43's)
TK-10427 |
9 |
| AR800, AR900, AR950, BC8500XLT, PRO2022, PRO2024, PRO2027, PRO23, PRO37?, PRO39, PRO3032, PRO42, PRO44, PRO51 |
MC 3361
N
MC 3361 BP
MC-3361 BD |
9 |
| BC100XL, BC350A, BC400, BC400XLT, BC560, BC560XLT, BC700A,
BC760, BC760XLT, BC800XL, BC800XLT, BC890XLT, BC950, BC950XLT,
MR8100, PRO2025, PRO2026, PRO2028, PRO2030, PRO41, R1600 |
NUM3359DA
MC3359P
NJM3359DA |
10 |
| BC100XLT, BC200, BC200XL, BC200XLT, BC205, BC205XLT, BC550XLT,
BC855XLT, PRO35, PRO46, R4030 |
TK-10421
M-2
TK-10421 M-3
TK-10421-3LT |
11 |
| AR2002, AR3000, MX7000, MX5000, PRO2002, PRO2003, PRO2020, SR001 |
MC3357P |
9 |
| ICOM
R1 |
TK-10487M |
12 |
| BC2500XLT, PRO26 |
TK-10930V
TK-10930VTL |
12 |
Special thanks to -Bill Cheek- for this information