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Sequencers
Ideal for contesting, our sequencers prevent damage from improper switching by controlling the receive-to-transmit timing of linear amplifiers, preamps, and other sensitive...
Ideal for contesting, our sequencers prevent damage from improper switching by controlling the receive-to-transmit timing of linear amplifiers, preamps, and other sensitive equipment. They also eliminate leading-edge chopping and truncating of Morse characters to improve your overall sending accuracy. Control timing of PTT turn-on, hang delay of PTT, amplifier hang delay, and more. You can even alter external power to active antennas or external relays that need to have power removed during transmit! Take your CW operation to the next level—add a sequencer to amateur radio setup today!
Ideal for contesting, our sequencers prevent damage from improper switching by controlling the receive-to-transmit timing of linear amplifiers, preamps, and other sensitive equipment. They also eliminate leading-edge chopping and truncating of Morse characters to improve your overall sending accuracy. Control timing of PTT turn-on, hang delay of PTT, amplifier hang delay, and more. You can even alter external power to active antennas or external relays that need to have power removed during transmit! Take your CW operation to the next level—add a sequencer to amateur radio setup today!
SSB Electronic DCW 2004 B Sequence Controllers
SSB Electronic DCW 2004 B Sequence Controllers provide properly timed power to remote mast-mount preamplifiers, as well as timed keying for RF amplifiers and transverters. Designed for convenient remote powering of SP and MHP series preamplifiers via the coaxial cable, the integrated sequential control reliably prevents sensitive preamplifiers from being damaged by RF peaks during switching operations. For the control of external devices, the DCW 2004 B provides three switching outputs with increasing delay times, so other components can be activated in a defined sequence. Features of the DCW 2004 B Sequence Controller: • Remote power (bias tee) via the coaxial cable for SP and MHP series Preamplifiers. • Delayed switching of RF linear amplifiers. • Three sequentially controlled switching outputs. • PTT input for switching to ground or +5 to +12 VDC. • Independent switching of preamplifier and power amplifier. • Low insertion loss of only 0.1 dB and high shielding effectiveness. • Automatic short-circuit test of the preamplifier feedline. • Last-State Function stores the previously selected operating mode. Please note: Extended Connections diagram must be used for proper keying delayed sequencing (see the diagram in the Documentation link). Advance keying is required for SSB mode with a footswitch, or for CW mode an external keyer with a PTT output, which must be connected to the sequencer (via pin 3 in and pin 1 Ground). With these initial Ground on Transmit PTT signals, each output is delayed by 200ms, 250ms and 300ms respectively: First, the sequencer removes bias tee coax DC power to the mast-mounted preamplifier; Second, it keys the amplifier (via pin 5 out); Third, it keys the transceiver (pin 6 out) or transverter. Fourth, the extra relay output on pin 7 for the transceiver if a transverter is used. Upon release of PTT input, all outputs release immediately, except for an additional 200ms delay before power is restored to the receive preamplifier. Due to timing delay of transmitter keying, CW mode keying of the transceiver cannot use VOX. Technical Specification of the DCW 2004 B: - Operating Power: 12 – 14 VDC, 2.1mm center positive - Band Coverage: 6 m, 4 m, 2 m, 1.25 m, 70 cm, 33 cm, 23 cm - Power Handling (Digital, CW & Phone): - 6 m / 1500 W - 2 m / 1500 W - 70 cm / 800 W - 23 cm / 400 W - Insertion Loss: 0.1 dB - Preamplifier Power (bias tee): 13.8 V max 500mA load - PTT switching output: 30 V at 500 mA max. - Relay switching outputs: 30 V at 500 mA max. - Ground On Transmit Voltage PTT Input Threshold: < +2 V - Positive Voltage PTT Input Threshold: > +5 V - Dimensions (WDH): 5.512 x 4.724 x 2.087 in. (140 x 120 x 53 mm)
Not Yet Reviewed
$485.99
DX Engineering Time Variable Sequencer Units
DX Engineering Time Variable Sequencer Units are microprocessor-based transmit/receive control signal-delay units. They can provide 0-30 milliseconds of delay, programmable in 2 milliseconds increments, to as many as five different outputs tied to your CW keying or push-to-talk (PTT) lines. By controlling the receive-to-transmit (and back) timing of linear amplifiers, and other sensitive equipment, damage caused by improper switch timing may be avoided. These DX Engineering TVSUs improve CW performance by eliminating the annoying leading-edge chopping or truncating of Morse characters, especially important in contests or pileups, where sending accuracy is critical. Now RoHS-compliant, they may 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. Two 2.1mm power plugs and two 3.5mm stereo plugs are provided. Additional TVSU features include: * 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 0-30ms in 2ms increments * Side tone generator that follows input of keyer or hand key, not transmitter * Side tone pitch can be programmed from 300 to 1,000 Hz in 50 Hz steps * Front panel headphone jack with adjustable volume * Supports CW full break-in * Can control external power to DX Engineering active receive antennas and thereby permit operation in closer proximity to transmit antennas Note: Whenever the DX Engineering "Documentation" tab is available, please look at the associated files for additional product information. To make sure that all of your equipment keeps safely in step, use one of these DX Engineering Time Variable Sequencer Units!
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$319.99
I0JXX SEQJXXBOX Sequencers
I0JXX SEQJXXBOX Sequencers are advanced switching control units for preamplifiers, power amplifiers, transceivers and transverters typical of VHF, UHF and SHF amateur and commercial radio systems. When using independent low-noise mast-mounted or inline preamplifiers and inline power amplifiers, the correctly sequenced timing of PTT and disconnect signals must be sent before keying a transceiver or transverter. The required task of preventing preamplifier burnout, power amplifier hot switching and potential relay damage is very well handled by the SEQJXXBOX. Featuring independently configurable time delay sequencing for SSB and CW modes, the SEQJXXBOX has four separate output relays which are tied in series to ensure the proper switching sequencing of every critical component in the receive-transmit chain. Configurations and functions are entered with a four-button control and Status info in RX and TX is displayed on a 2x16 alpha-numeric blue-tone readout. Independent front panel switches for turning on or off the Preamp, the Power Amp, and the Sequencer, along with programmable control over CW Break-In and relay timing provides intuitive and helpful operational flexibility. Two rear panel 8-screw barrier strips handle all input and outputs, so simple stripped lead wiring is required from all peripheral components. A simple Foot Switch for SSB PTT is provided with each unit. FEATURES of the I0JXX SEQJXXBOX Sequencer: • Switching delay time RX>TX TX>RX Every mode from 50 to 500 mS (step 10 mS) • Switching delay time CW TX>RX from 100 to 900 mS (step 100 mS) • CW Break-In operations configurable (enabled by default) • Name or Call Sign on display (up to 6 alphanumeric characters) • Display lighting 2 modes: always on / on only during configuration SPECIFICATIONS of the I0JXX SEQJXXBOX Sequencer: INPUT: MIC-PTT (foot switch) CW-KEY (3 contacts, straight key or Iambic paddle Display: LDC 2 lines per 16 letters, blue color (with contrast adjustment) Menu access: 4 front panel pushbuttons Power Requirement: 12 VDC @ 180 mA TX; 40 mA RX. (No internal battery) Dimensions, WHD: 3.937 x 1.969 x 4.331in. (100 x 50 x 110mm) Weight: 1.343 lbs. (650 g) The I0JXX SEQJXXBOX is an indispensable tool for proper and successful operation of each crucial component in a VHF, UHF, or SHF station.
Not Yet Reviewed
$229.99