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Last modified 2017-12-17

Heathkit SB-104A

A picture of Heathkit SB-104A
This radio has had its mike jack modified with a 4-pin metal locking ring connector


Type:Amateur HF transceiver
Frequency range: 10-80 m + WWV
3.5-4.0 MHz (80 m)
7.0-7.3 MHz (40 m)
14.0-14.3 MHz (20 m)
21.0-21.5 MHz (15 m)
28.0-29.7 MHz (10 m)
15.0-15.3 MHz (WWV, RX only)
Tuning steps:Continuous
Channels/memory management:No
Repeater shift/offset:No
Power supply:12.6-16 VDC
Current drain/power consumption:RX: 2 A
TX: 3 A (Lo), 20 A (Hi)
Antenna impedance/connector:50 ohms / SO-239
Dimensions (W*H*D):368*146*352 mm (14.49*5.75*13.86")
Weight:9.1 Kg (20 lbs)
Other features:

Receiver system:Double conversion superheterodyne
1st IF: 8.65 MHz
2nd IF: 3.395 MHz
Sensitivity:SSB: 0.5 uV (10 dB S+N/N)
Selectivity:SSB: 2.1 KHz (-6 dB), 5 KHz (-60 dB)
CW: 400 Hz (-6 dB), 2 KHz (-60 dB), with CW filter option
Image rejection:60 dB
AF output power/speaker:2.5 W at 10% distortion / 4 ohms
External speaker connector:

RF output power: Hi: 100 W (PEP)
Lo: 1 W (PEP)
Modulation system:
FM deviation:No FM
Spurious emissions:Less than -? dB
Microphone impedance/connector:Hi-Z / 2-pin

Manufactured:USA, 1977-1982 (Discontinued)
Additional info:
Related documents: User manual (42.5 MB)
Assembly manual (76 MB)
Illustration booklet (4 MB)
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A rear picture of Heathkit SB-104A