Specifications

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TABLE 2. TROUBLESHOOTING GUIDE.

Defect Possible Cause

PA Idling Current

Unstable

1. Defective Power Amplifier Tube (V4).

2. Defective BIAS control and/or associated components.

3. Defective bias power supply.

Inability to Load per

Operating Instructions

1. Antenna not resonant at operating frequency.

2. Defective transmission line.

3. Defective antenna loading coil(s).

4. Tubes V1 through V4 defective

Insufficient Sideband Suppression

1. Carrier Oscillator (Q3) operating on incorrect frequency.

2. Crystal filter defective or mistuned.

Insufficient Carrier Suppression

1. Tube V13 defective.

2. Transformer T1301 defective or mistuned.

3. Carrier Oscillator (Q3) operating on incorrect frequency.

Microphonics in Transmitter

1. Tubes V13 and / or V14 defective.

2. IF coil L701 Defective or incorrectly adjusted.

3. Microphone defective.

Low Receiver Sensitivity

1. Tubes V5 through V10 defective.

2. Incorrect adjustment of the transmitter Pi-Network.

3. IF coil L801 incorrectly adjusted or defective.

4. K1 relay contacts defective.

TABLE 3. VF0 AND CARRIER OSCILLATOR FREQUENCIES.

Tuning Dial

Injection

Frequency

Osc.

Frequency

Osc. Carrier

Frequency

26,950 KC 21,450 KC (1/2) 10,725 KC 5500 KC

27,260 KC 21,760 KC (1/2) 10,880 KC 5500 KC

28,500 KC 23,000 KC (l/2) 11,500 KC 5500 KC

29,000 KC 23,500 KC (1/2) 11,750 KC 5500 KC