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Last modified 2023-12-17

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Alda 103 (By ALDA Communications Inc.)

A picture of Alda 103 (By ALDA Communications Inc.)


Type:Amateur HF transceiver
Frequency range: 20-80 m in three bands
80 m:   3.5-4.0 MHz
40 m:   7.0-7.5 MHz
20 m:   14.0-14.5 MHz
Tuning steps:Analog / continuous
Frequency stability:Less than 100 Hz per hour @ room temperature
Mode:SSB / CW
Channels / memory management:
Repeater shift / offset:No
Power supply:13.8 VDC
Current drain / power consumption:RX: Max 400 mA
TX: Less than 20 A
Antenna impedance / connector:50 ohm / SO-239
Dimensions (W*H*D):229*83*318 mm (9*3.25*12.5")
Weight:3.66 Kg (8.25 lb)
Other features:

Receiver system: Single conversion superheterodyne
IF: 9 MHz
Sensitivity: 0.5 uV (10 dB S+N/N)
Selectivity: 2.5 KHz (-6 dB)
5 KHz (-60 dB)
Image rejection:Better than 65 dB
AF output power / speaker:3 W at 5% distortion / 3 ohm
External speaker connector:

RF output power:

SSB (PEP):~100 W (250 W PEP input)
CW:~100 W (250 W DC input)
Modulation system:
Max FM deviation (Factory set):No FM
Spurious emissions:Better than -45 dB
Microphone impedance / connector:3 Kohm / ?-pin (1/4" jack)
Microphone input level:? mV

Manufactured:USA, 1977-197x (Discontinued)
Additional info: The dial was available in Braille for the blind ham

New price, august 1978 in the US: $495.00
Related documents:Service manual (40.2 MB)
Modifications and fixes:
Reviews:QST: December 1978, page 31
Options / Accessories:
Noise blanker
Crystal calibrator (10 / 100 KHz)
Portable unregulated power supply. 13.8 VDC, 15 A (115/230 VAC)
Heavy duty regulated power supply. 13.8 VDC, 30 A (115/230 VAC)
A rear picture of Alda 103 (By ALDA Communications Inc.)