Make your own free website on Tripod.com
Next Page
page 7 - 5


SCHEMATIC CHANGES AND EQUIPMENT DIFFERENCES



IDENTIFIER DESCRIPTION
  do not apply to the circuit shown In above. If replacing any of these components, recommend replacing with values shown on schematic.

C10 is a test select component; 10 to 150 pF for balanced modulator circuit shown on schematic and 10 to 75 pF for circuit shown In above. The value is selected in manufacturing test to balance C9 range. It is selected to provide not more than 0.2 Vac rms rf output after carrier balancing (refer to paragraph 4.7 for procedure) In some early units(configuration , and ), C10 may be connected in parallel to C9.

R140 a test select component, 390 ohms to 27 kW. The value is selected in manufacturing test to provide ALC threshold of 2 to 5 mV (refer to paragraph 4.7 for procedure)

R201, 220 kW, added. This change isolates VOX amplifier V14B from VOX GAIN control R39. If this component is not in the unit, it does not have to be added.

R199, 2.2 megohms, added. This change improves the VOX TIME CONST control R43 range. if this component is not in the unit, it does not have to be added.

R202 was added to limit relay K2 energizing current. On some units it was 330 ohms and was located in the cathode circuit of V4B (see circuit below). On later units, the value was changed to 12 kW and relocated in the plate circuit of V4B as shown on the schematic. If replacing this component, recommend replacing with a 12-kW resistor in the plate circuit of V4B. (If R202 was in the cathode circuit of V4B, Install a Winchestor standoff terminal near pin 5 of XV4 to provide a the point for R202 and the red-white wire disconnected from pin 8 of XV4.) If R202 is not in the unit, check to see if relay K2 is an open-telephone or enclosed type. If K2 is an open-telephone type, do not add R202; If it is an enclosed type, add R202, 12 kW, in the plate circult of V4B.

VOX

KWM-2 and KWM-2,A Transceivers. Schematic Diagram
figure 7-l (Sheet C)

Next Page