Model SEQ-1 Microprocessor Controlled Transverter Sequencer

The Model SEQ-1 Transmit/Receive Sequencer is the first Microprocessor Controlled Transverter Sequencer on the market to provide one heartbeat and four visual outputs for confirmation of operation, and the ability to program a different time delay value for the outputs sequences. The one second Heartbeat is used to give an indication that the SEQ-1 is functioning properly and to provide an error status during the programming phase. The 4 state LED's give a visual indication of the sequence and step operation.

Today's modern transverters use very low-noise front-ends to provide the best signal to noise ratio possible. But these low-noise front-ends will not survive the high transmit power levels found in most transverter systems. Especially during the switching from receive to transmit and back to receive. A sequencer is needed to protect these low-noise front-ends from the potentially destructive transmit power levels, and normal relay contact bouncing found in every RF antenna change over relay. The SEQ-1 provides four sequenced open collector outputs to control your transverter sub-systems switching requirements. Each open-collector output is capable of switching up to 35 volts at 600 ma continuously. Using open-collector outputs allows for direct control of relay coils. Using additional analog circuitry, other switching schemes are possible with the SEQ-1. Also provided is the ability to invert the active output state of any of the four open-collector outputs.

The sequencer is enabled by using either the Low-Enable input, or the High-Enable input pins. The Low-Enable input is a connection taken to ground to cause the sequencer to activate. The High-Enable input connection requires a positive input voltage from +2.0 to +14 volts to cause the sequencer to activate.

Provisions have been made to allow the user the ability to reprogram the time delay value used to control the sequencer on/off steps. This allows the user to fine-tune the delay time for the environment being controlled. For example, if the RF switching is all solid state, like PIN diode switching, then a smaller time delay value would be appropriate. If you are using mechanical relays, a longer time delay would be required to allow for contact settling. What's more, the time delay value can be programmed right in the circuit. No need to remove the SEQ-1 from your system to change the delays. The default delay value is 32 milliseconds for each step, but is programmabel from 4 msec to 128 msec per step.

  • 13.8 Vdc @ 50ma typical (no switched output active)
  • 35 Vdc @ 600 millamperes open collector switching capability, Four outputs total
  • Enable High or Enable Low input to activate sequencer
  • Visual states displayed on 4 Green State LED's
  • 1 second Yellow Heartbeat indicator
  • Programmable delay times from 4 msec to 128 msec (default is 32 msec)
  • Operating Temperature Range 0 Deg C to +70 Deg C
  • Can be mounted behind a front panel, dimensions provided for mounting using 1/2" spacers
  • Full 1 Year limited warranty

Link to -> On-line Model SEQ-1 Manual