[600MRG] U3S with T/R relay

[Edward R Cole]

Steve,

It looks like you want a sequencer:
http://www.downeastmicrowave.com/category-s/1833.htm

model TRS ...$120 assembled
or TRSCK kit ... $85
or TRSK ... $35 pcb kit w/o hdwr or enclosure

73, Ed - KL7UW

At 02:12 AM 11/1/2016, Steve Flood wrote:
>I plan to use an Ultimate 3S for WSPR operation.  I will be using it to
>drive an external Class D amplifier (using the square-wave output from the
>U3S synth chip with its own PA disabled).
>
>
>
>I am having trouble figuring out how to activate the output T/R antenna
>relay prior to RF transmission.  Likewise I need to key the driver stage of
>the external amp.  This all needs to be automated for unattended WSPR TX/RX
>sessions.
>
>
>
>I was hoping to use the +5v "KEY" output from the U3S to activate the relay
>and driver, but Hans tells me that it is essentially simultaneous to the RF
>output.  I am trying to avoid hot-switching the T/R antenna relay or causing
>a load fault shutdown.
>
>
>
>Any ideas?   How have others used the U3S with a T/R antenna relay?
>
>
>
>Thanks,
>
>Steve KK7UV/WH2XNV
>
>
>
>
>
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73, Ed - KL7UW
http://www.kl7uw.com
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