The TS-820 is an upgrade to the
TS-520S. It incorporated
additional features and performance improvements while retaining the successful
hybrid combination of solid state and vacuum tube technologies. It covers the most popular amateur HF bands (160,
80, 40, 20, 15 and 10 meters) with 100 watts CW power output and somewhat more
SSB peak envelope power. WWV can be received at 15 MHz for frequency
and time synchronization. The receiver sensitivity is excellent -- 0.5
microvolts for a 10 dB signal plus noise to noise ratio, typical of the entire
line of Kenwood hybrids.
The TS-820 was designed to accept
installation of the DG-1 digital frequency display as a kit. In a
companion model, the TS-820S, the DG-1 display was factory installed. So the
only -- yes, only -- functional difference between a TS-820 and a TS-820S is
the presence of the DG-1 display. With the DG-1 kit installed, a TS-820
becomes a TS-820S except for the name plate.
The TS-820 models include
frequency shift keying with selectable offset, a phone patch that can be used
for recording or connection to a computer sound card, a more accurate analog
frequency readout with 25 kHz crystal calibrator, an improved impulse noise blanker, and the DG-1 digital
frequency display with 100 Hz resolution. They employ a very stable VFO and
phase locked loop (PLL) heterodyne oscillator to provide a single conversion
architecture that reduces spurious responses (birdies) and provides exceptional
image rejection. New to this model was IF shift capability that makes it
possible to tune out moderate adjacent channel interference. XIT, RIT, and
VOX with semi-break-in CW are included. Continuing
Kenwood's attention to audio quality, this upgrade's speech processing added
variable compression to increase SSB average power incrementally.
Normally powered from 120
or 240 Volt power mains, an optional 13.8 Volt DC power module can be
installed. Like its predecessors, it is easy to tune and
operate, and frequently used functions are accessible from the front panel.