ZETRON 30 Worldpatch, Instruction Manual

Page: 41 / 60

Section 5. Installation
5-3
until the CARRIER LED comes on, then rotate the control clockwise until
the LED goes out again and a little past that. Supply the modulated signal
again to verify that the CARRIER LED comes on and stays on while signal
is present. If it flutters or won’t stay on with DTMF or voice present, turn the
control clockwise a little more until it stays on solid. Remove the signal and
the LED should drop out smartly.
2. ACCESS THE PROGRAM MODE:
FROM THE PHONE:
While the CARRIER LED is off, dial the number the Model 30 is on using a
line other than the one the Model 30 is connected to. After approximately 14
rings (60 seconds), the Model 30 will answer the line with a double beep.
Key in the program mode access code (default is 12030). When the program
mode is accessed, a five beep “go ahead” chirp is heard. The Model 30 will
not answer the phone at all while the CARRIER LED is on.
FROM A DTMF RADIO:
If it is more convenient to do so, the test may be accessed over the radio
channel from a DTMF equipped handheld or mobile radio. The program
mode access code is the same for both phone and mobile programming. If the
unit does not respond to your attempts to access the program mode and the
RECEIVE GAIN and CARRIER are set, check the DECODE polarity
jumper JP6 and make sure it is in the correct position (“B” for active high
decode or no decode input connected, and “A” for an active low decode
input.)
3. SET TRANSMIT AUDIO GAIN: Start with the jumper JP3 in the “B” (low
gain) position. Enter the DTMF command “92#”. The transmitter will be
keyed and a 1 kHz test tone will be generated for 90 seconds. Using a service
monitor, adjust the TRANSMIT LEVEL pot (R5) for 70% of full channel
deviation (typically 3.5 kHz). If the deviation won’t go high enough, move
JP3 to the “A” (HI) position and try again.
Note: THIS IS NOT THE REPEAT AUDIO LEVEL ADJUSTMENT! That
comes in step 4.