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When the PTT input line is pulled to ground, the first relay K1
(connected to J1) switches, followed by K2, then K3 and finally K4. When
releasing the PTT input from ground, the relays will de-activate in the
reverse order. If, at any time the PTT input is changed in mid
sequence, the sequence will automatically reverse, giving the same
sequence delay for all changes. Normally K1 will be connected to your antenna relay. K4 will
enable the application of RF power to the antenna, whether by turning on
the final amplifier, or enabling a transmit inhibit on your radio.
K2 and K3 can provide turn on of intermediate amplifiers as needed for
your system. You may want to read my article on sequencing if you
are new to using a sequencer. See
Sequencing for VHF Stations The potentiometer labeled R6 is the sequence speed control.
Turn it clockwise to increase the time delay between each relay
activation. The range is from almost instantaneous to about 1/2
second for each sequence. You want to make sure it is slow enough
to allow every relay to be activated, or deactivated during it's own
sequence. Normally a delay of 100 to 200 milliseconds will be
satisfactory. Faster if you are sure you have fast relays. A good way to wire external relays (antenna relay and others) is to
always have power to the plus side of the relay and bring the negative
sides to the sequencer, where they will be grounded when the sequencer
relays activate. Thus you can connect the common sequencer outputs
to ground and the negative leads from your relays to the NO (normally
open) sequencer output. IMPORTANT NOTE: Do not forget to use protection diodes on all
your external relays! Without the diodes, the reverse EMF from
turning those relays off can damage your equipment, including the relays
in the sequencer.
This is the SEQ-3 relay sequencer board. It has a 4.0 by
2.5 inch board. It requires a power supply of +12 volts, and a PTT
input line that goes to ground to activate the relays. The output
relays can be connected for normally open or normally closed, until
sequenced. Also the 4 position slide switch can be used to reverse the
sense of each relay individually. The outputs are solder pads along the
top, just above the relays in the picture. See below for the schematic.