[NLRS] Using a Sequencer on 10 GHz

[Melvynkc0p at aol.com]

Subject: Using a DEM 4 stage T/R  Sequencer

3 Sep  2008

I have the sequencer built and it works. Now how
to  use it ? I think I have figured a way to sequence
things without breaking  open the microphone PTT
circuit. Here is a State diagram of how it would  work.



State 4  Transceiver ALC forced to -2.5  v= SSB  Operate,
cuts 5 watt power out down to about 2  watt.
Hello, CQ DX !


State 3  DEM Transverter to TX by  PTT low


State 2  DEM 3 W amp On by Ctl  Low


State 1  Pick Microwave T/R relay to put in Xmt  mode


State 0  Transceiver ALC forced to -4  v=Cutoff
no power out  allowed.
Transceiver in Receive  mode
Transverter in Receive mode

Transition from State 0 to State 1 is  initiated by
Microphone PTT or Manual CW hold switch. Transitions
to  States 2, 3, and 4 are controlled by the sequencer
time constant. When the  Microphone PTT is released,
the sequence is reversed all the way back to  State 0
and I am again in receive mode.

I could use one circuit of the  stage 4 relay to control
the ALC being fed back to the IF  Transceiver;
Common to Transceiver ALC input
N/C    Tied to a -4 volt source
N/O    Tied to a -2.5 volt source

I think this should  work. Any comments about something
I may have missed ?

Mel  KC0P    




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