GAI-Tronics 370-301 Dual Channel 600-Ohm to 33-Ohm Converter - Manual (Page 9)

Pub. 42004-431B
370-301 Dual Channel 600 to 30-Ohm Converter Page 9 of 9
f:\standard ioms - current release\42004 instr. manuals\42004-431b.doc
02/15
7. Monitor the signal level at pin 1 of the header for the 33-ohm activation. In the unit it is located at
the top of the header. This is the sidetone signal level. Adjust the 600-ohm balance potentiometer
for minimal signal level at pin 1.
8. Install the jumper P3 for Channel 1 or P9 for Channel 2 to activate the 33-ohm output and fine tune
the 600-ohm volume level potentiometer, R37 for Channel 1 or R81 for Channel 2, for desired output
level side.
Attaching the Front Panel
After all adjustments have been completed, place the front cover on the rear enclosure, being careful not
to pinch any cables. Secure the front cover using the four screws and washers provided. Torque the
screws to 10–12 in-lbs (1.13–1.36 n-m).
Specifications
AC/DC Input
AC Power Supply
Input voltage ...................................................................................... 120/230 V ac (nominal), 50/60 Hz
Power factor @ nominal 120 V ac .................................................................................................... 0.98
Current draw @ nominal 120 V ac ............................................................................................. 100 mA
DC Power Supply
Input voltage .......................................................................................................................... 12–24 V dc
Current draw @ nominal 12 V dc ............................................................................................... 175 mA
Current draw @ nominal 24 V dc ............................................................................................... 130 mA
33-Ohm Audio Output
Output with 1 Vrms at 600-ohm input ................................................................... 1.5 Vrms, factory aligned
2.3 Vrms maximum
Distortion .............................................................................................................................. <1.5% @ 1 kHz
Sidetone ...................................................................................................................... -30 dB factory aligned
VOX threshold ........................................................................................................................... >150 mVrms
VOX activation time ............................................................................................................ <50 milliseconds
VOX holdtime............................................................................................................................... >4 seconds
600-Ohm Audio Output
Output with 1.5 Vrms at 33-ohm input .................................................................. 1.0 Vrms, factory aligned
1.3 Vrms maximum
Distortion .............................................................................................................................. <1.0% @ 1 kHz
Sidetone ...................................................................................................................... -30 dB factory aligned
VOX threshold ........................................................................................................................... >200 mVrms
VOX activation time ............................................................................................................ <50 milliseconds
VOX holdtime............................................................................................................................ >3.5 seconds
Relay Outputs
Maximum load ........................................................................................................................ 2 A @ 30 V dc
Dimensions ..................................................... 14.50 H
 8.31 5.26 D inches (368.3  211.1  133.6 mm)
Shipping weight ................................................................................................................. 10.5 lbs. (4.76 kg)
Net weight ............................................................................................................................ 9.5 lbs. (4.31 kg)