TEN-TEC has expanded its line of DSP based receivers. Tuning from 2 MHz to 3 GHz, the 1 ms synthesizer lock time provides realistic scan rates of 100 channels/sec or faster. One outstanding benefit of the DSP architecture is more than 50 built-in filter bandwidths from 100 Hz to 300 kHz, most useable in any detection mode. Strong signal handling is assured with a typical in-band 3rd order intercept of -3 dBm. In addition to conventional AGC presets, RX-400 includes a programmable mode. This allows the customer to build their own unique AGC characteristics specifically for a mission. A 21.4 MHz wideband IF output is provided with 6 MHz of bandwidth. The RX-400 includes both an RS-232 interface and TCP/IP. Receiver is modestly sized for ? rack installation. Options will include: a Digital Data output, Narrowband IF output and a POTS interface to allow customer to remote unit anywhere with access to nothing but a phone line (no PC required).
Mode BW dBm
(for 12 dB NF)
SSB 10 db S/N 3 kHz -117
AM (50% mod) “” 6.0 kHz -108
FM-N @ 6 kHz dev 16 dB SINAD 15 kHz -107
FM-W @ 10-20 kHz dev “” 30-50 kHz -102
FM-W @ 75kHz dev “” 200 kHz -96
DYNAMIC RANGE: in-band
Freq. NF (dB) IP3 (dBm)
Typ Max Typ Min
2 MHz – 88 MHz 12 15 -2 -5
89 MHz – 1650 MHz 13 16 -3 -6
1651 MHz – 3 GHz 14 17 -3 -6
2nd ORDER INTERCEPT: 50 dBm minimum
AGC: Fast, Medium, Slow, Programmable. Manual gain setting is provided in all four modes, adjustable over 120 dB range. DUMP feature provided in all modes.
Mode Attack(dB/ms) Hang(sec) Decay(dB/sec)
Fast 0.8 0 1200
Medium 0.8 0 100
Slow 0.8 0 25
Prog. 0.01-1.0 0.01-99.9 0.01-99.9
WIDEBAND IF OUTPUT, ANALOG: 21.4 MHz center frequency, fixed gain, 6 MHz bandwidth, 10 kHz tuning steps. 2 MHz bandwidth if receiver tuned below 20 MHz.
S-METER: reports signal level in dBm to host upon request
OPTIONS: (only one may be installed)
DIGITAL DATA OUTPUT: 23 bit, I&Q, serial. Baseband representation of NB-IF output
NARROWBAND IF OUTPUT: 21.4 MHz center frequency, bandwidth determined by filter selection, delayed AGC
CONTROL INTERFACE: built-in MULTI-DROP RS-232 (DB9 connector) and TCP/IP
Optional: POTS – allows customer to remote unit anywhere with access to nothing but a phone line. No PC required.
FIRMWARE: can be updated remotely in Flash ROM
ANTENNA INPUT: 50 ohm, unbalanced, SMA connector. 2.5:1 VSWR max @ receiver’s tuned frequency.
RF INPUT PROTECTION: accepts +20 dBm w/o damage
AUDIO LINE OUTPUT: 0 dBm (+/- 3 dBm) 600 ohm outputs. Terminals may be grounded or shorted together without damage. One AC coupled, one DC coupled
HEADPHONE OUTPUT: both 1/4″ and 1/8″ stereo phone jacks. 10 mw maximum into 600 ohms. Front panel volume control.
POWER REQUIREMENTS: 90-264 VAC, 48-440 Hz @ 36 watts typical, 0.6 PF @ 120VAC, 60 Hz. Removable six foot line cord included.
OPTION: substitute 11-28 VDC supply at additional cost
DIMENSIONS: 7.5″W x 17″D x 3.5″H. Without knobs and fan. Rack mountable with optional bracket kits for either half rack or full rack widths.
WEIGHT: 10.25 lbs. (4.65 kg)
MTTR: less than 30 minutes for replacement of any of 9 major subassemblies.
BITE: Built-in self test capability will identify virtually all faults to the board level.
Mute: for use in transmit/receive applications, mutes audio and IF outputs.
Antennas Remote Lightning Protection
Amateur Radio Antenna Remote Disconnect for Lightning Protection from alk on Vimeo.
Video by Art K4FWJ
A single lightning strike can destroy thousands of dollars worth of radio equipment. Experienced...