3
Equipped with ±0.1ppm TCXO
The standard equipment includes a TCXO (temperature-compensated crystal
oscillator), which stabilizes frequencies at ±0.1ppm as the standard signal source.
Unlike OCXO (Oven Controlled crystal Oscillator), which requires warm-up time, this
device can start up quickly even from the power-off position, while maintaining a high
level of stability. It is in compliance with European energy-saving standard Lot6. Power
consumption in stand-by energy-saving mode is less than 0.5 W. A BNC connector on
the rear pannel provides 10MHz reference I/O.
2-2. Sub receiver
Down conversion for amateur bands below 15m
The sub-receiver features reception performance that has exceeded its class since
going on sale, thus further refining this popular receiver on the TS-590.
Because this is particularly the case on the front end, where it employs circuit
configuration that makes down-conversion possible on the leading five amateur bands,
it can be used in actual operation despite being just a sub-receiver.
* The IF bandwidth for 160m/80m/40m/20m/15m bands is (SSB/CW/FSK/PSK) for
frequency levels 2.7 kHz or below.
Roofing filter, 500 Hz, 2.7 kHz
Frequencies of 500 Hz and 2.7 kHz are standard for sub-receiver roofing filters.
You can maintain a more or less flat dynamic range even if interference impinges on
your reception frequency, thanks to superior close-in dynamic range properties. You
can clearly catch signals under conditions made problematic by strong close-in
interference signals.
2-3. Triple DSP
Equipped with dedicated DSP for the main-receiver,
sub-receiver and band scope
Kenwood continues to provide quality sound transmission that is
unattainable through analogue circuits. By loading the world-
premiere DSP on the TS-950 and achieving IF AGC control on
the TS-870 by using DSP for the first time for amateur wireless
devices. As a culmination of the foregoing developments, three
DSP units are used, one on each major block of the TS-990.
By distributing the signal processing of the main IF, band scope,
and sub-IF, we have realized ample digital signal processing.
(FM mode is AF DSP processing.)
Advanced AGC control
The reception sound quality of SSB and CW is not solely determined by audio
frequency and filter delay properties. AGC characteristics play a very significant role as
