Tait T2004 System Manual page 74

74 Part B T2004 Control Heads
Audio
Transmit on microphone and apply audio (E.G. whistle into
microphone), check for approx. -15dBm line audio at TP2, check for
approx. -30dBm mic audio on SK1 pin 7. Radio should enter transmit
mode and have normal TX deviation.
With the radio in receive mode, generate a test signal of -70dBm RF
level, 60% system deviation (1.5kHz for narrow band, 3kHz for wide
band). Check for approx. -4dBm of receiver audio on SK1 pin 6. Check
for approx. -10dBm line audio on TP2. Ensure audio appears on 600
ohm balanced line (measure between SK3 pins 4 and 5).
Data
Turn radio off then on using control head volume switch. Use
oscilloscope to check for 5V TTL data on SK1 pin 4. Note that data only
lasts a few seconds after power on. Connect oscilloscope channel 1 on
SK3 pin 7, channel 2 on SK3 pin 8. Verify differential mode data exists
on RS485 line at radio power on.
After power up, confirm that key presses on control head appear as 5V
TTL data on SK1 pin 3.
T2004 Multi-Control Head System Manual
© Tait Electronics Ltd May 2004