Models 2M3-30Ps 2M10-80P, 2M30-160P, 1.3MI0-70P and 1.3M30-140P are included in this particular sheet. Variances for different models are slight, mostly power transistor changes with some variances to Unelco capacitors values. The higher power models contain two modules and a combiner board.

Power Supply: Nominal input voltage should be 13.6 VDC, negative ground only. Limits are 11.5 - 14.5 VDC, 12-15 ampere capacity for 70P and 80P, 25-30 amp for 140P and 8 amp for 30P.

Rated Input Levels: 3W nom, 5W Max for 30P model, 10W nom 18W Max for 70P and 80P models, 25W nom 40W Max for 140P and 160P. As low as WW drive will activate and be amplified by all models. All authorized emission permitted by all models.

Rated Outputs: 30P rated 30W output, 70P rated 70W output, 80P rated 80W output, 140P rated 140W output, 160P rated 160W output. All output levels rated at nominal input power and voltage specifications. Note: due to increased harmonic suppression levels required by FCC R & 0 20777, the low pass filter may impart loss to output power level causing variance of 1/2 - 1 dB from rated output to be experienced.

Preamplifier: Gain is nom. 11dB gain +/-3dB all models. Noise Figure is nom. 2.0dB for 144MHz, 2.5dB for 220 MHz models. NF may vary +/-0.5 dB from these values.

Impedances: Input impedance is 50 ohm nom; limits, under 2:1 SWR with variable tuning. Output impedance 50 ohm nom, SWR under 2:1 yields best results; up to 3:1 satisfactory results, higher SWR operation not recommended. Output impedance matching adjustment included.

Frequency Range: 144-148MHz for 2M models, 220-225MHz for 1.3 models. Due to wide-band design and the variable tuning included, approx. 10X over-range is possible, thus allowing MARS coverage.

Physical Dimensions: 14.9 W x 18.4 L x 7.0 H mm; 1.4 kg for 30P, 70P and 80P models. 14.9 W x 27.3 L x 7.0 H mm; 1.8 kg for 140P and 160P models. Shipping weight approx. 1.6 kg for 30-80P and 2.0 kg for 140-160P models.

Mounting and protection: All models may be mounted in any plane by use of the mounting lip integral to the heat sink. Some allowance for air circulation should by made. For others than ICAS ratings (25-30X transmit on time) forced air cooling may be required. A small muffin attached to the heat sink fins fan will suffice. The amplifier has built-in SWR and reverse voltage protection. For use in harsh environments, an additional protective enclosure should be utilized.

Operation: Amplifier operation is simply by attaching a suitable antenna or load to output or antenna jack, a suitable driving source to input or xcvr jack and DC power of 13.6V, negative to black and positive to red (or white) leads. To use the power amplifier feature, select amp on switch. The appropriate LED should light. To use the preamplifier feature, select RX on switch. The appropriate LED should light. When exciter is activated, the RF sensing circuitry will activate the relays, automatically switching the power amplifier into circuit and preamplifier out, if it had been selected, and the RF out LED should illuminate.


Both the power amplifier and preamplifier may be selected for use independently of the other. When used in the transmit mode, all necessary switching is automatically accomplished. To increase the delay time for relay drop out for SSB or CW mode, select the SSB/FM switch to SSB. Since the amplifier is Class AB, linearized, any mode including FM may be used in either switch position. This switch SSB/FM only changes the delay time.

Adjustments: Five adjustments are included within the amplifier. Power Amplifier Board: Two variable capacitors on the power amplifier board allow input matching to exciter system, and to antenna/load system for output. The output match trimmer (located under output connector) should be tuned for maximum output power. The input match trimmer (located under input connector) may be adjusted for maximum output. In event your exciter contains an overly sensitive SWR shut down circuit, it may be necessary to effect compromise tuning by adjusting the trimmer for best SWR and output power tolerable to exciter. Relay - Preamp Board: The small variable resistor located approximately at the board center should be adjusted in the SSB mode for desired drop out delay. Max clockwise position (min resistance) may cause loss of T-R activation. Some resistance must be left in the pot for proper operation. Preamplifier Board: The preamplifier contains two trimmer capacitors, color-coded red and blue. The left (blue) trimmer is the input and must be adjusted only for best NF. This can on]y he done with proper NF measuring equipment. Tuning this capacitor for max. gain will seriously degrade NF and the overall signal to noise improvement otherwise expected will he lost. Unless you have proper noise figure equipment DO NOT ADJUST BLUE INPUT TRIMMER. The right (red) trimmer is output tuning, and should be adjusted for max. signal level or noise at center of your operating hand.

Note: To enter the internal workings, remove the four Phillips screws from the front panel. Gently push the switches to move the panel slightly down and out, while sliding the bottom cover plate out of its retaining groove. Reverse procedure to re-install both bottom plate and front panel.

Warrantee: All models are warranted for one year to be free from defects in materials and workmanship. Power transistors are warranted for 90 days. The warrantee does not hold for instances of misuse or abuse nor in cases where voltage transients from poorly suppressed power source cause failure.

Remote Operation: Remote control of the 3 functional modes, TX and RX amplifiers and SSB/FM delay is readily accomplished in all models. A separate remote control head and cable plugs into the same rear panel power plug. When remote control is ordered, the amplifier is fitted with appropriate cabling. When ordered as a separated unit, the appropriate internal wiring and instructions are included. The owner may elect to return the amplifier for this retrofit if desired. There is a nominal fee of $10 for this service.

For hard keying, applying a jumper from a positive 13.5VDC to base of the T-R sensing transistor MPSA13 (top of delay pot) will cause activation of the system without RF sensing required. However; due to high sensitivity of the T-R circuitry, this method is usually not required, except in very low drive level cases.

Note: Specifications are subject to change without notice.