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SECTION II
OPERATION


Page 2-1


SECTION II
OPERATION

2.1 OPERATION IN AMATEUR BANDS.

Table 2-1 shows normal and full-scale meter readings. If the exciter is a KWM-2/2A or S-Line, set exciter BIAS ADJUST to produce an idling plate current of 50 ma. Tune and load according to exciter instruction book.

  1. Connect the antenna for the band in use to the RF OUTPUT jack on the 30L-1. (When the ON-OFF switch is in OFF position, the transfer relay in 30L-1 connects the antenna to the exciter.)

  2. Make sure the ON-OFF switch in the 30L-1 is in the OFF position as shown in fig 2-1.

  3. Tune and load the exciter into the antenna. If the antenna does not present a nearly 50-ohm resistive dummy load, such as the DL-1. When switched to the in put of the 30L-1, the exciter will then remain in tune.

  4. If using a Collins exciter, switch back to TUNE position, and set MIC GAIN to off position.

  5. Set the 30L-1 METER switch to off position.

  6. Set BAND switch to same band as that of the exciter, LOADING control to 1 on the dial, anf TUNING control to white area for the band in use.

  7. Oress the 30L-1 ON-OFF switch to the ON position.

  8. Set MIC GAIN to about 3/4 of full scale. (When using exciters other than KWM-2/2A or S-Line types, set microphone gain aproximately 20 watts drive to the 30L-1.)

  9. Immediately adjust TUNING and LOADING controls for zero multimeter reading. The meter will indicate zero at the dip when the amplifier is properly tuned and loaded. Always make the TUNING adjustment for meter dip as the last adjusment.

  10. Switch the exciter to the desired sideband or to CW, and reduce exciter MIC GAIN Control to normal.

 

operating level. The station is now ready to operate at rated power input.
1. Once the equipment has been tuned up on a given frequency, The 30L-1 may be switched in or out of the circuit at will by operating ON-OFF switch. Output power from the amplifier is avilable instantly with no warm-up period required.

DO NOT operate the 30L-1 into a load preseting a vswr greater than 20 to 1. The equipment may not function properly and damage may result. DO NOT operate the amplifier in continuous key down at full input for more than 30 seconds. The power supply may be damaged. DO NOT use the 30L-1 in FSK, AM, or FM service. DO NOT use slow blow fuses, or fuses larger than 8-ampere type supplied.

2.2 OPERATION WITH OTHER MAKES OF
      EXCITERS.

Tune according to the procedure outlined in paragraph 2.1/ If alc is not used, be careful not to overdrive either the exciter or the final amplifier. Normal plate current meter readings for 30L-1 are from 300 to 350 ma on voice peaks. Actual plate current under these conditions will peak at approxiamately 600 to 700 ma. Besure the exciter is capable of producing the required drive without excessive distortion. If not, the amplifier may be operated at reduced level.

2.3 OPERATION OUTSIDE AMATEUR BANDS.

Operating outside amateur band limits requires retuning of the 30L-1 input circuits. This is necessary to present the proper load impedance to the exciter. For procedure, refer to paragraph 4.4.



TABLE 2-1. MULTIMETER SCALE VALUES
METER SWITCH SETTINGFULL-SCALE INDICATIONNORMAL INDICATION

Tune

D.C. VOLTS

D.C. AMPS

Not applicable

2000 volts

1.0 amp (1000 ma)

Zero when 300L-1 is properly loaded

1800volts (No modulation)
1600 volts (At rated load)

600 ma (Key down CW)
300-350 ma (SSB voice peaks)
110 amps (Keyed, no excitation.)


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