Specifications

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50 / 86 28.8.2007 13:16
Excellent receiver. Great sensitivity. LF/MF/HF only. Goes down to 0kHz. Very expensive. Rack mount.
Beautiful design. Uses digital processing inside.
Discontinued in 2001 Ten-Tec RX-340 $3950 http://www.tentec.com/rx340.htm
The following comments about the RX-340 was found on the Internet:
"It replaced a Drake R8B which, up to that time, was my choice for the best all-round HF receiver currently in
production. It is better. Lots better."
The Ten-Tec RX-340 is a multi-mode, general coverage synthesized receiver utilizing extensive Digital Signal
Processing. DSP brings the performance and repeatability of expensive military grade communications receivers
into the price range of top end commercial receivers for shortwave listeners. Tunable from 5 kHz to 30 MHz, it
provides tuning steps and display resolution of 1 Hz. All three displays are blue/green vacuum fluorescent and
provide unparalleled contrast and readability.
The performance level of receivers in this class is possible only through extensive use of Digital Signal
Processing. These designs utilize fewer analog circuits than traditional receivers. Powerful, specialized DSP
microprocessors replace many of the discrete circuits with intensive software containing over 60,000 lines of
code. High dynamic range analog stages provide 1st , 2nd and 3rd I.F.s (and 80 dB of AGC) where signals then
pass through analog to digital converters. Everything else is accomplished in DSP including all mode detection,
I.F. filters, AGC (remaining 40 dB), adjustable BFO, passband tuning and noise blanker. An astounding 57 I.F.
bandwidths from 100 Hz to 16 kHz are included. All filters have shape factor of 1.5:1 or better (6 to 60 dB).
USB, LSB, ISB, CW, AM, Synchronous AM and FM are built-in. Four AGC modes are provided. Conventional
Fast, Medium and Slow modes are familiar but the "Programmable" mode is groundbreaking. User may build
their own personal AGC characteristic by selecting attack, hang and decay rates. Manual control from front panel
is also adjustable over 120 dB range. A tunable notch filter rejects unwanted signals in the passband. Receiver
front end incorporates built-in preselector with eight ½ octave bandpass filters. Switchable 10 dB preamp and 15
dB attenuator are also provided. Signal strength meter is calibrated in both s-units and dBm.
Ten-Tec has been a supplier of commercial/government grade receivers for some years now. Our RX-331 was
previously available only in a "black box" version for remote control. That model is used in government/military
applications worldwide where multiple units run 24 hours/ 7 days a week without interruption. RX-340 uses
these field proven circuits (the PC boards are identical) brought together in a new cabinet with a comprehensive
front panel. This provides conventional operation from the panel while retaining all of the remote control aspects
of its predecessor. A built-in multi-drop RS-232 interface permits remote operation at baud rates from 75 to
38,400. Accessed from rear panel DB-25 connector, the interface can be configured for single or multiple
receiver applications. The complete command language is published in the manual so enterprising users can
write their own remote control software. RX-340 also includes Built-in Test or "BITE". This self-test capability
will identify virtually all faults to the board level.
Memory and scan features fall into four categories: a scratchpad memory, 100 memory channels, memory scan
and F1 to F2 scan. Each memory channel retains the frequency along with mode, I.F. bandwidth and BFO
setting. Dwell time is programmable, Channel lockouts are provided and a pause feature lets you interrupt scan
momentarily. Squelch works in all modes and adjusts over a 150 dB range.