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701-307 Handset/Speaker Amplifier (24 V DC)
Problem
Feedback occurs only during
page.
Feedback/distortion (a hum or
buzz on the line) occurs during
®
all Page/Party
station
operation.
Sidetone (how the operator
hears his own voice) requires
adjustment.
Crosstalk occurs.
Specifications
Amplifier
Power requirements (24 V dc)
Voltage..................................................................................... 21–28.8 V dc range, 25 V dc nominal
Power consumed: zero/max. signal (12 watts) ................................................. 2.75 W/58 VA, 27 W
Construction/Finish................................................................ 16-gauge cold-rolled steel/gray baked enamel
Handset
Microphone............................................................................................................Dynamic, noise-canceling
Receiver ..........................................................................Dynamic, hearing aid compatible per FCC Part 68
Cable ............................................................................................................Retractile, 6-foot extended PVC
Material.......................................................................................................................................... Gray ABS
External controls..................................................... Push-to-page handset pressbar and handset hookswitch
Handset Amplifier
Output level........................................................................................... 1.5 V
Output limiter..................................................................................................................... 1.5 V
Gain....................................................... 55 dB nominal (below limiter level); adjustable from 40 to 63 dB
Frequency response...................................................... 250–4000 Hz, ±3 dB ref. to 1,000 Hz (below AGC)
Distortion ................................................................................................ 1.5% maximum THD @ 1,000 Hz
Controls...............................................................................Microphone gain, receiver volume and sidetone
Speaker Amplifier
Output ................................................................................ 12 watts minimum with nominal supply voltage
Voltage gain...................................................................................................... 26 dB maximum, adjustable
Frequency response........................................................................... 250–4,000 Hz, ±3 dB ref. to 1,000 Hz
Distortion ......................................................................................... 1% maximum THD @ 1 kHz, 12 watts
Input impedance........................................................................................................... 50,000 ohms nominal
f:\standard ioms - current release\42004 instr. manuals\42004-422b.doc
10/10
Use the muting feature in the amplifier enclosure at the terminal blocks.
Connect the violet wire at terminal 8 to terminal 7.
1. Adjust the receiver sidetone on the rear of the amplifier using the
ribbon cable assembly as described above.
2. The line may be improperly terminated. Inspect the system cable
for loose connections, shorts, and grounds. Line balance assembly
connections are critical.
3. Replace the line balance assembly.
1. Adjust the receiver sidetone at the amplifier, using the extension
ribbon cable as described above.
2. Check that the line balance assembly resistors are connected
properly. See GAI-Tronics Pub. 42004-140.
One or more system cable pairs may be improperly terminated.
Visually inspect the system cable connections for accidental crossing of
the cable pairs or grounds.
Pub. 42004-422B
Solution
nominal into 33-ohm load
RMS
3 of 4
Page:
nominal
RMS