[600MRG] U3S with T/R relay

[K2ORS]

There are better and cheaper sequencers out there:
http://www.advancedreceiver.com/page20.html

http://www.w6pql.com/relay_sequencer.htm

I've used both and can vouch for them.

73 Warren K2ORS



----- Original Message ----- 
From: "Edward R Cole" <kl7uw at acsalaska.net>
To: "Steve Flood" <kk7uv at bresnan.net>; <600mrg at w7ekb.com>
Sent: Tuesday, November 01, 2016 11:10 AM
Subject: Re: [600MRG] U3S with T/R relay


> 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
>     "Kits made by KL7UW"
> Dubus Mag Business e-mail:
>     dubususa at gmail.com
>
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