[600MRG] U3S with T/R relay

[Edward R Cole]

Since WSPR will be used to control the station, 
then you connect the RS-232 (RTS or DTR) line to 
the sequencer input (NOT to the radio).  The DEMI 
sequencer provides either PTT-LO (ground to key) 
or PTT-HI (voltage over +5v to key) 
inputs.  Connect the computer RS-232 to the 
PTT-HI input and connect the radio (U3S?) keying 
to the 4th stage relay in the sequencer.  DEMI 
provides about 30ms delay for everything to happen before the 4th stage.

Hundred's if not thousand's of eme stations have 
been successfully NOT hot-keying kilowatt amps 
for 30+ years using sequencers.  No code writing is required for WSPR.

I run WSPR exactly this way:  computer keys 
sequencer- stage1 controls preamp power; stage2 
controls TR relay; stage3 controls amplifier 
keying; stage4 enables K3 keying (I use the Tx 
inhibit feature in the K3 - but that is not available on many transceivers).
http://www.kl7uw.com/TX-INHIBIT.htm

73, Ed - KL7UW

At 11:38 AM 11/1/2016, John Molnar wrote:http://www.kl7uw.com/TX-INHIBIT.htm
>I'm not sure how a classic sequencer (external 
>PTT starts RX->TX sequence) works here.
>
>If U3S asserts it's 'PTT' +5v signal EXACTLY 
>with appearance of the RF, a sequencer does nothing
>for you.  The TX is going to hot switch at the T/R relay.
>
>Hans needs to add code to the WSPR mode to 
>assert a PTT signal at the 2 min. TX sequence. in advance of the RF.
>
>This is exactly what WSPR on a computer does 
>with RTS/DTS in advance of the tone.
>
>John XKA
>
>
>
>On Tue, Nov 1, 2016 at 3:14 PM, K2ORS 
><<mailto:k2ors at verizon.net>k2ors at verizon.net> wrote:
>There are better and cheaper sequencers out there:
><http://www.advancedreceiver.com/page20.html>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" <<mailto:kl7uw at acsalaska.net>kl7uw at acsalaska.net>
>To: "Steve Flood" 
><<mailto:kk7uv at bresnan.net>kk7uv at bresnan.net>; 
><<mailto:600mrg at w7ekb.com>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>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
>
>
>
>
>
>---
>This email has been checked for viruses by Avast antivirus software.
><https://www.avast.com/antivirus>https://www.avast.com/antivirus
>_______________________________________________
>600MRG mailing list
><mailto:600MRG at w7ekb.com>600MRG at w7ekb.com
><http://w7ekb.com/mailman/listinfo/600mrg_w7ekb.com>http://w7ekb.com/mailman/listinfo/600mrg_w7ekb.com
>
>
>
>-----
>No virus found in this message.
>Checked by AVG - <http://www.avg.com>www.avg.com
>Version: 2015.0.6201 / Virus Database: 4664/13328 - Release Date: 11/01/16
>
>
>73, Ed - KL7UW
><http://www.kl7uw.com>http://www.kl7uw.com
>Â  Â  "Kits made by KL7UW"
>Dubus Mag Business e-mail:
>Â  Â  <mailto:dubususa at gmail.com>dubususa at gmail.com
>
>_______________________________________________
>600MRG mailing list
><mailto:600MRG at w7ekb.com>600MRG at w7ekb.com
><http://w7ekb.com/mailman/listinfo/600mrg_w7ekb.com>http://w7ekb.com/mailman/listinfo/600mrg_w7ekb.com 
>
>
>
>
>---
>This email has been checked for viruses by Avast antivirus software.
><https://www.avast.com/antivirus>https://www.avast.com/antivirus
>
>
>_______________________________________________
>600MRG mailing list
><mailto:600MRG at w7ekb.com>600MRG at w7ekb.com
><http://w7ekb.com/mailman/listinfo/600mrg_w7ekb.com>http://w7ekb.com/mailman/listinfo/600mrg_w7ekb.com
>
>
>No virus found in this message.
>Checked by AVG - <http://www.avg.com>www.avg.com
>Version: 2015.0.6201 / Virus Database: 4664/13331 - Release Date: 11/01/16

73, Ed - KL7UW
http://www.kl7uw.com
     "Kits made by KL7UW"
Dubus Mag Business e-mail:
     dubususa at gmail.com