4-way PTT sequencer board

This is simply 4-way PTT sequencer, designed for PTT switching from one input to 4 outputs with different (fixed) delay.

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38.72 € (tax incl.)

38.72 €
32.00 € (without tax)

in stock, shipped in 2-3 days

Price history

The lowest price in the 30 last days was 38.72 €

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Description

This 4-way PTT sequencer is product designed for PTT switching from one input to 4 outputs with different (fixed) delay. You can split PTT signal to 4 independent devices with different timing: LNA, PA, RF relays etc. This device also protects your PTT output from external accessories. There is optocoupler isolator between PTT input and all four PTT outputs. Outputs are switched to ground when PTT is active. There are FET outputs without any additional delays.

Using

PTT sequencer for LNA, PA, TRX etc.
Power supply soft start
CPU and peripheries reset

Main functions

Universal (PTT) sequencer
Protecting PTT input (TRX) from accessories - opto isolators
FIXED delay 60 ms
OUT T0 is without any delay with PTT IN
4x output FET switch - DC 50 V 0.5 A
Board with SMD parts without connectors
ASSEMBLED VERSION

Parameters

Sequencer delay is fixed 60 ms
Sequencer from RX to TX PTT IN to: T0 = 0 ms, T1 = 60 ms, T2 = 120 ms, T3 = 180 ms
Sequencer from TX to RX PTT IN to: T0 = 0 ms, T1 = 180 ms, T2 = 120 ms, T3 = 60 ms
Optocoupler isolator protection at PTT IN port
OUTPUTS are open while input PTT is in RX, shorted to GND while input is in TX
When you need to switch positive voltage (LNA) you can use P-FET switch - example
Input PTT logic active when grounded
Input PTT logic current typ. 15 mA
Output FET switch 50 V 500 mA for each port
DC power supply 9 V to 15 V typ. 30 mA DC cable connection
PCB size 50x50.4 mm