TM 11-4625-16-12
3-9. FAN Section Control and Conector
Control, indicator, fuse, or connector
Function
Switch S19 ...............................................................
In TEST position, disconnects power from internal fan and applies power to
AUT.
Connector J22 ..........................................................
Connects transmitter test facility to AUT.
3-10. AIR OUTLET Section Connector
When the screwed cap is removed, forced air cooling
routed from the AIR OUTLET through the hose
from the internal fan is supplied. The forced air can be
assembly air duct (3, fig. 1-2) to AUT.
3-11. TRANSMITTER RADIO Section Controls and Connectors
Control, indicator, fuse, or connector
Function
Switch S21 (11 -position rotary switch)......................
Connects ac power to AUT. Connects METERING
section to power supply voltages in AUT. Tests modulation path
attenuation in AUT.
Sw pos
Function
+ 28 V .............................
Meter M1 indicates voltage of + 28 volt dc
supply in AUT.
+26V ...............................
Meter M1 indicates voltage of +28 volt dc
supply in AUT.
+600V .............................
Meter Ml indicates voltage of +600 volt dc
supply in AUT.
DRIVER FIL ....................
Meter MI indicates driver tube filament
voltage in AUT.
OUTPUT FIL ...................
Meter M1 indicates output tube filament
voltage in AUT.
0 DB ...............................
Inserts 0 dB attenuation in modulation
path in AUT.
6DB ................................
Inserts 6 dB attenuation in modulation
path in AUT.
12 DB..............................
Inserts 12 dB attenuation in modulation
path in AUT.
3.5 DB.............................
Inserts 3.5 dB attenuation in modulation
path in AUT.
9.5 DB.............................
Inserts 9.5 dB attenuation in modulation
path in AUT.
OFF ................................
Removes ac power from AUT.
PWR ALM SET LEVEL control .....................................
Adjusts dc signal level to control alarm in AUT.
Connectors J23- and J28+ ...........................................
Metering points for dc signal to control alarm in AUT.
Switch S22 400 Hz r -pr4-loded)...................................
In TEST position, loads 128 volt, 400 Hz supply in AUT and
connects one-tenth of voltage to J24 and J29.
Connectors J24 and J29 ..............................................
Metering points for 400 Hz supply from AUT when S22 is operated.
Switch 823 600 V
Pressed and held to indicate on meter M1 voltage of 600 volt supply
from AUT through switch S21 +600 V position.
Switch S24 OVERHEAT...............................................
Pressed and held to test overheat indicator on AUT.
Connector J26 VID IN ..................................................
Connects video modulation signal to AUT.
Connector J30 AF IN....................................................
Connects order wire modulation signal to AUT.
Connector J27 and JS1................................................
Connect transmitter test facility to AUT.
3-6
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