This solution giving lot of possibilities.
Antenna relay sequencer.
I built the sequencer on basic copper strip board and added four relays and jumpers so that for each event i could either switch the line to ground provide 13 8v or in the case of the lna switch the 13 8v supply off.
Relay in each position is possible to setup for switching to on or off according of request.
A sequencer is the key to protecting those expensive microwave or other antenna relays from hot switching which destroys the contacts.
Rl1 is held on by the current loop through d1 as the field tries to collapse.
Also on the pcb is possible to choice if relay on pcb is in on or off position.
An enable signal to the sequencer will produce sequential output commands to a rx relay a tr relay an amplifier and a transverter automatically plus a polarity change lockout.
Sequencer with relays is a fast solution and you may to setup it within few tens of minutes.
All rf relays are capable of safely handling much more rf power than they are capable of hot switching without damage.
One output is able to sink up to 100v at several amps and the remaining 3 up to 40v at about 500 ma each.
But it can be used in any amplifier antenna scheme.
It pulls in last time delay is set by r4 r3 and c2.
Switching ps 230v 15v 4 5a supporting relays in antenna pas lnas.
This applies current to rl2 the input relay.
The s2 sequencers primary application is for vhf uhf transverter amplifier and antenna switching.
But any relay is relatively very unreliable device delay is not constant humidity dust and temperature has bad impact to the life time and connectivity of contacts mechanical parts have limited durability.
A sequencer is the key to protecting those expensive microwave or other antenna relays from hot switching which destroys the contacts.
This sequencer will handle up to 4 events.
After rl1 antenna relay current reaches a value that allows contact transfer q2 will conduct.
The s2 sequencers primary application is for vhf uhf transverter amplifier and antenna switching.
Having looked at many different solutions i found that the w6pql sequencer met my requirements the closest.
Several years ago i described 4 a fool resistant transceiver interface and sequencer which improved some of the shortcomings of previous.
Dcw2004b vhf sequencer the dcw 2004 b vhf sequence controller provides precise sequential controlled switching of a vhf power amplifier rig transverter and lna pre amplifier and also provides a remote feeding voltage for the super amp range of pre amplifiers via the coaxial cable.
The are immune to rf electromagnetic field.
But it can be used in any amplifier antenna scheme.
There is an additional description of a sequencer in the 300w 23cm amplifier article listed on the left.
Upon release of control tx rl2 releases with only internal relay delays.
