Specifications

Appendix C: Using a Model 620x in a Model 26-based System
186 025-9581M
and serial programming mode at the Model 26 and disconnect the laptop. Return
the Model 26 to normal operation.
♦ Setting the Model 6203 transmit level:
1. At the Model 26 location, attach an oscilloscope to monitor the incoming signal
level from the wire-line.
• 2-wire = J14 pins 9 (AUD+) and 10 (AUD-)
• 4-wire = J13 pins 3 (AUD+) and 4 (AUD-)
2. At the Model 6203, connect the laptop (or PC) to the serial programming port of
the Model 6203. Move switch SW1-8 on the transponder motherboard to the ON
position. Hit the SPACE bar three times to open the Model 6203 Main menu.
3. Enter an “8” to start the {8} FFSK LEVEL SET test tone sequence. The Model
6203 should key its radio and transmit for 30 seconds and then unkey. If you finish
making adjustments before 30 seconds is up, you can cancel the test by hitting any
character key on the computer keyboard. If you require more time, enter an “8”
again.
4. While the FFSK test tone is being transmitted by the Model 6203, adjust the R108
pot (FFSK OUT) on the motherboard of the Model 6203 for a level of 1.0 Vp-p
(0.35 Vrms) is measured at the FFSK test point (TP6) on the back of the Model 26.
If the signal cannot be set low enough, move JP5 in the Model 6203 from position
TEL to RAD. If the signal cannot be set high enough, move JP5 from position
TEL to PWR.
5. When finished making adjustments, let the test signal time-out or stop the test.
6. Enter the letter “e” as many times as necessary to exit the programming mode.
Move switch SW1-8 on the transponder motherboard to the OFF position.
Remove the serial cable from the transponder.
Once the level setting procedure has been completed and both the transponder and the
Model 26 returned to the normal operating mode. The Model 26 should soon
communicate with the new transponder and display its current status.
Setting Voice Audio Output Level to the Station PA System
As stated elsewhere in this manual, it is not intended that the Model 6203 or Model 6204
station transponder unit directly drive the PA speakers in the fire station in which they are
installed. The PA audio coming from J3-pin9 and J3-pin 11 should be routed to an input on
the station house PA amplifier.
Note This procedure only sets the FFSK levels. For information on setting
the final voice audio output level to the station PA system, see
Setting Voice Audio Output Level to the Station PA System on page
186.