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DXE-TVSU - Time Variable Sequencer Unit
The DX Engineering TVSU-1A
Time Variable Sequencer Unit
is a microprocessor-based transmit / receive control-signal delay
unit. It provides 0-30 ms of delay, programmable in 2 ms increments, to as many as five
outputs tied to the CW keying or push-to-talk (PTT) lines. By controlling the receive-to-
transmit (and back) timing of linear amplifiers, preamplifiers, and other sensitive equipment,
damage caused by improper switching can be eliminated. This sequencer improves CW
performance by eliminating annoying leading edge chopping or truncating of Morse
characters. This is especially important in contests or pileups where sending accuracy is
critical.
Now RoHS compliant, the TVSU can also control external devices such as preamps, active antennas, or external relays that need to
have power removed during transmit. Separate power-in and power-out jacks on the front panel are used to control external power in
this type of application. Two 2.1 mm power plugs and two 3.5mm stereo plugs are provided.
Benefits
Control timing of PTT turn-on, hang delay of PTT, amplifier hang delay, external antenna relay hang delay and
turn-on delay of auxiliary output
Dip switch settable delays of 0-30 milliseconds in 2 millisecond steps
Side tone generator that follows input of keyer or hand key not transmitter
Side tone pitch can be programmed from 300 to 1000 Hz in 50 Hz steps, front panel headphone jack with adjustable
volume
Supports CW full break in
Can control external power to our Active Receive Antennas and permit operation in closer proximity to transmit antennas
DXE-NCC-2 - Receive Antenna Variable Phasing Controller
Noise Canceling Receive Antenna Controller
Reduce overload or interference by nulling a strong local signal or noise before it gets to your receiver
Better and more stable nulling than any other noise canceller on the market
Peak weak signals hidden under a strong signal on the same frequency
Null out local AM broadcast stations
Null out noise from power line arcing, lamp dimmers, motors and consumer electronics arriving from a single direction
Antenna Phasing Controller
Best alternative to DX Engineering's Receive Four-Square antenna
Combine two antennas to create a directional pattern
The NCC-2 enables you to adjust the antenna array pattern as if you were moving the antennas
Use for direction finding
Special Features
Exceptional Dynamic Range, nearly 1000 times better than nearest competitor
Phasing is voltage controlled allowing precise resetting of phase
Phasing rotates more than 360 degrees with smooth control
Built-in two channel voltage controlled attenuator system
Low noise, high dynamic range amplifiers
Vastly superior dual channel complementary phasing system
Very low noise floor
Separate controls for reversing channel and phase
Works on all modes, 300 kHz to 30 MHz
Provides power for external active antennas
Input for mute on transmit
