ZETRON 37-MAX - Connection to an EF Johnson CR1010 (Alternate Hookup)

Section 5. Installation
5-15
Connection to an EF Johnson CR1010 (Alternate Hookup)
For: Zetron Model 37-MAX
To: EF Johnson CR1010
Using: 709-7179 Generic Radio Cable
37-MAX End
Function
J1
pin#
Wire
Color
Radio End
Connection/Notes
+12 volts DC 1 RED Logic Drawer, pin-15, +13.8 v
Ground 2 BLACK Logic Drawer, pin-13, Ground
Discriminator Input 3 WHITE Logic Drawer, pin-5
Ground 4 BRAID No connection
TX Audio Output 5 BLUE Exciter drawer, pin-1, TX Audio
Ground (spare) 6 N/C
PTT Output 7 ORANGE
Logic Drawer, pin-23,
P
T
T
Ground 8 BROWN Ground
COR Input 9 YELLOW Logic Drawer, pin-19, Fast Squelch
CTCSS/DCS Encode 10 GREEN Logic Drawer, pin-18, TX Tone CG
CR1010 Configuration (Alternate Hookup)
1. Remove the brown wire from the receiver going to the exciter transmit audio (pin 1).
NOTE: This configuration uses the limiter and the high-pass filter in the exciter of the
CR1010. Since the Model 37-MAX also has a high-pass filter to remove the CTCSS/DCS
encode from the repeat audio, the two high-pass filters in series may degrade the quality of
the repeat audio. The repeat audio quality may be improved by deleting (bypassing) either the
high-pass filter in the Model 37-MAX or the exciter of the CR1010.
To delete the high-pass filter in the Model 37-MAX, lift one end of R43, then add a wire
jumper across C34, and another wire jumper across C35.