Heath Heathkit SB-10 Schematic Diagram

SB-10 SSB Adapter

SB-10 SSB Adapter

● Amateur band coverage only for maximum stability and accuracy

● Produces USB, LSB or DSB signals with or without carrier insertion

● Built-in VOX with anti-trip circuit

● Sealed audio phase shift network

Switch to SSB for more talk power ... less fade & interference with this SSB

file:///C|/Users/John/Desktop/sb-10.htm (1 of 2) [8/21/2008 6:11:36 PM]

SB-10 SSB Adapter

ADAPTER

Designed as a compatible plug-in adapter unit for the TX-1 "Apache" transmitter, the SB-10
allows operation on single sideband for increased versatility. This adapter will also be of
interest to amateurs now operating strictly AM or CW with other transmitters such as the
Heathkit DX-100. By making a few simple circuit modifications, most modern transmitters can
be used utilizing all existing RF circuitry. Extremely simple to operate and tune, the adapter
employs the phasing method of generating a single sideband signal, thus allowing operation
entirely on fundamental frequencies. The critical audio phase shift network is supplied
completely preassembled and wired in a sealed plug-in unit. Also featured are single-knob
bandswitching, an easy-to-read panel meter that indicates relative-power output to aid in
tuning and built-in electronic voice control with anti-trip circuit which allows duplex operation
but prevents receiver output from turning on the transmitter during listening periods. RF
excitation from the transmitter is required for the adapter to provide an SSB signal which is
then fed to the transmitter final for amplification.

Specifications—Power output: 10 watts P.E.P. (peak envelope power). Power input: Less
than 3 watts of RF at the fundamental operating frequency required. Output: Pi network, low
impedance, coaxial. Input: Low impedance, coaxial. Band coverage: 80, 40, 20, 15, 10
meters. Circuitry Phasing method of SSB signal generation is employed with voice control
and anti-trip action built into the audio circuit. Power requirements: 350 VDC @ 85 ma, 6.4
VAC @ 3.5 amp. Meter: 2½", 200 ua movement, indicates carrier null and relative power
output. Cabinet size: 10" H x 6¾" W x 13" D

file:///C|/Users/John/Desktop/sb-10.htm (2 of 2) [8/21/2008 6:11:36 PM]