M850-00
T856/857 Functional Testing
C4.3
Copyright TEL 31/09/98
4.1 Current Consumption
Connect the T856/857 to a 13.8V power supply.
Connect an RF power meter to the T856/857 output socket.
Check that the current in the 13.8V power cable is less than 150mA.
Key the T856/857 by earthing the Tx-Key line (the carrier "On" LED should light).
T856 Only: Adjust RV310 (power control) to obtain 25W output power.
Check that the current is as follows:
T856 <5.5A
T857 <750mA.
4.2 Output Power
Connect an RF power meter with suitable attenuation to the T856/857 output
socket.
Key the T856/857 by earthing the Tx-Key line.
Check that:
T856 the output power adjusts to ≥25W with RV310 (power control)
turned fully clockwise
T857 the output power is 1W ±300mW.
4.3 Output Frequency
Connect the T856/857 output to a frequency counter via an attenuator pad:
T856 40dB pad
T857 20dB pad.
Measure the output frequency and, if necessary, adjust the TCXO (=IC700) to trim
to the nominal frequency (±100Hz).
4.4 Timers
The transmit tail timer, transmit timeout timer and transmit lockout timer can all
be set from PGM800Win. The fields for setting these are found on the system
information page. These three timers operate as follows (refer also to Figure 4.1):
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