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SECTION I
Installation


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1.3.3 KWM - 1 SERIAL NUMBERS ABOVE 861.

If KWM-1 models above serial number 861 are used with the 30L-1, it will be necessary to bring out alc and "ground-on-transmit" connections from the 516F-1 power cable plug, P-1, as shown in figure 1-3. Make the alc connection to terminal 19, and the "ground-on-transmit" connection to terminal 20. Use a shielded wire, and connect to 30L-1 ALC and ANT. RELAY jacks with phono plugs.

1.3.4 KWM-1 SERIAL NUMBERS BELOW 861.

If models below serial number 861 are used with the 30L-1, it is necessary to make connections inside the KWM-1 for alc and antenna relay control.

  1. Use an ohmeter to locate the feedthrough capacitor. C169, which is connected to pin 19 of J5.
  2. Connect a wire from this feed through capacitor to pin 7 of tube XV10.

  3. Using an ohmeter to trace the wiring, locate the feedthrough capacitor, C206, which is connected to terminal 20 of J5 in KWM-1.

  4. Connect a wire from terminal 8 of TB1 in KWM-1to c106.

  5. Make corresponding breakout connection to P1 terminal 19 whit shielded wire, and connect to the 30L-1 ALC jack with a phono plug.

  6. Refer to figure 1-3, Detail A. External to the KWM-1, connect a 10,000-ohm, 5 watt resistor and a relay coil in series from J5 terminal 20 to a ground on the rear of the KWM-1 chasis. Use a relay, such as Collins part number 972-1346-00, with a 10,000-ohm, 10-ma coil, and a set of normally open contacts
 

g.  

Connect the normally open contacts through a piece of shielded wire and a phono plug to the 30L-1 ANT. RELAY jack.



BE CAREFUL To protect the operator from the 260-B+ present on the relay coil and resistor connections. It is recommended that this circuitry be enclosed in a suitable shield box.

NOTE

The r-f cable supplied for connecting the 32S-1. KWM-2/2A, or KWM-1 to 30L-1 is 20.5 feet long. This length results in slightly lower system distortion than normally is obtained with other lengths of cable; however, a shorter lenght can be used for convenience.

1.4 INSTALLATION WITH OTHER MAKES OF
     EXCITERS.

Connect the r-f- output of the exciter to the RF INPUT jack on the 30L-1. Exixting antenna switching equipment between receiver and exciter may be left intact. To transmit, a ground must be supplied to the ANT. RELAY jack on the 30L-1. This removes blocking bias from the 811A tubes and energizes the internal antenna relay. Due to the variety of circuits involved, specific instructions for use of alc can not be given. A detailed study of paragraph 3.7 will be helpful if it is desired to utilize the alc provisions in the 30L-1.


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