Print Date 31/08/11 Page 16 of 22 E2136-00MA-02
2.3.2 Output Power Level and Frequency Adjustment
If the Amplifier is not supplied with preset output power levels and frequency, its front panel SET
POWER control and the Exciter/Drive(s)’ power output and frequency will need to be set. The manuals
for the type of Exciter/Drive(s) supplied or in use must be consulted for information on how the settings
required of them are actually made.
The procedure is as follows :
1) Ensure the Amplifier has been installed as detailed in sections 2.1 and 2.2. Check pin 11 of
the Status Connector SK02 is not grounded (i.e. is set for internal power level control - see
section 2.2.2).
2) Break the rear panel Interlock connection at SK02, pins 20-21.
3) Apply power to the Amplifier (i.e. ensure the supply distribution 16A MCB is on, the supply
lead is connected and, on E2137-05, 06, 07 and 08 variants, the rear panel supply switch
SW01 is on ‘I’ )
4) Ensure all the displays are illuminated (else follow fuse checking procedure as detailed in
section 2.3.1 (fault finding may be required if this occurs). Check Exciter/Drive(s) are operating
and use the Amplifier’s front panel push button switch to select the ‘Fwd Power’ display.
5) Set the Exciter/Drive(s) power output to minimum (which must be less than 13W) and
frequency to that required.
6) Set the Amplifier’s front panel SET POWER twelve turn control to fully anti-clockwise (i.e.
minimum power setting).
7) Reconnect the rear panel Interlock connection at SK02, pins 20-21.
8) Slowly adjust the Amplifier’s front panel SET POWER twelve turn control to fully clockwise (i.e.
maximum power setting) checking for a gradual rise in output power.
9) Adjust the Exciter/Drive(s) output power so that 500W is just obtained. To ensure complete
accuracy, an external calibrated power meter should be used to measure this output power.
Increase the input level by a further 1dB (approximately 20%). In no case however must the
input power exceed 13W
10) With the Exciter/Drive power set as described, turn the SET POWER control anti-clockwise
until the measured output power falls back to 500W (or less if required).
11) Check that the output power displayed on the front panel display. This reading will not be as
accurate as the external calibrated power meter but should be within about
±
0.25dB (approx.
25W).
12) Use the Amplifier’s front panel push button switch to select the ‘Rev Power’ display and check
for reverse power less than about 15W
The Amplifier will now be ready for operation with audio and or data sources applied to the
Exciter/Drive(s). The manuals for the type of Exciter/Drive(s) supplied or in use must be again
consulted for information on how such sources are applied and controlled.
The RF Monitor connector at the rear of the unit can be used to check the close-in spectrum of the
Amplifier output signal. Note that any harmonic levels shown will not necessarily indicate those
present at the Amplifier output. Any test equipment should not however normally be left connected.
