[NLRS] Sequencer

[Donn Baker]

Hi Jon,
Ian White, G3SEK, published a sequencer on his web site (don't know the
URL: Google 'G3SEK') using two DPDT relays.  The "trick" is that one is 12v
DC and the other is 6v DC.  It may also be written up in "The VHF DX
Handbook," don't know.

Paul Wade, W1GHZ also has published a desing for a more "sophisticated"
design (and has -had ?- PC boards available for it.  He's also put the PC
patterns on his web page.  Three boards, which should be at least 6
sequencers, cost $59 delivered from ExpressPCB.  

Although Bruce, W9FZ, and I have parts and boards for a number of W1GHZ's
sequencers, I don't think its an optimal design.  (Frankly, I've VERY
partial to the G3SEK design.)  Paul's design has a lot of "bells and
whistles," which I personally don't like.  (Will that stop me from using
them... most likely no.)  There's a lot of added complexity with a bunch of
time delay cirsuits, FET switches, etc.  I prefer relays.  BUT, relays are
getting hard to find (cheaply).

Good luck.

73 Donn
WA2VOI/0


At 15:02 27-11-03 EST, W0ZQ@aol.com wrote:
>Anyone aware of a simple design for a solid state sequencer ?  On transition 
>from receive to transmit the sequencer would delay the 12vdc to the
amplifier 
>(while the T/R relay energized) and on transition from transmit to receive
it 
>would then turn off the 12vdc to the amplifier before it de-energized the
T/R 
>relay.  Delay times would be around 100ms.  
>
>73, Jon
>W0ZQ
>
>
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