[aprssig] Roadtrip APRS Full DUplex

Scott Miller scott at opentrac.org
Mon May 14 17:21:54 EDT 2018

The upcoming Tracker4 has voice beacon capabilities - you can set up a 
script to play WAV files from its internal flash memory.  If you need it 
to QSY a radio, you'd probably have to hook up relays to the channel 
up/down buttons.  I did that many years ago for a fixed station that I 
needed to have transmit on two different frequencies.

Adding relays to the T4 is easy.  It's one of the things I'm testing 
today on the latest board revision.  This is my test program for a $10 
quad relay board:

' This program toggles each relay in sequence
for a = 1 to 20
    for b = 40002 to 40005
       modbus_write(1, b, 768)
       sleep 50
    next b
next a

Later on I'll be setting it up for reusable code blocks so instead of 
reading the datasheet to get the addresses and commands, you can just 
reference an existing module for known devices.  Trying not to get too 
bogged down in that stuff right now when I just need to get a T3 
replacement out the door.

I updated the T4 photo on the site now that we've got the latest board 
revision in: 

This board brings back the extra DB9 for serial devices like weather 
stations.  Unless I find something wrong with the board in the next day, 
this will be the production version and we should start shipping in 2-3 
weeks.  The graphics shown aren't necessarily final; I'm still waiting 
for my graphic artist to get back to me with something more polished, 
but we can do full color direct digital printing in house now so I can 
tweak it as much as I want without having to get new silkscreens made.


On 5/14/2018 1:04 PM, Fred Hillhouse wrote:
> I haven't seen the Byonics offering.
> I did this about 10 years back with the ADS-SR1 Simplex Repeater from Argent Data Systems.
> https://www.argentdata.com/catalog/product_info.php?products_id=98
> Best regards,
> Fred N7FMH
> -----Original Message-----
> From: aprssig [mailto:aprssig-bounces at tapr.org] On Behalf Of Robert Bruninga
> Sent: Sunday, May 13, 2018 5:00 PM
> To: TAPR APRS Mailing List
> Subject: [aprssig] Roadtrip APRS Full DUplex
> *** trimmed ***
> But you still need a 3rd radio for 52!   And this year I will be running
> AutoCQ on 52.  Byonics has made me an auto-CQ'er for the trip toDayton.
> It can be set to call a brief CQ once every 3 minutes (or 2 minutes, or 1
> minute).  This gives 52 the same advantage as Voice Alert does for APRS.
> On the 1 minute setting it only says my call.  On the 3 minute one it says
> CQ 52 and the call.
> The #1 problem with this device if everyone used it is the same as with
> nothing more frustrating on Voice Alert than someone pinging away with the
> volume turned down.  Byonics has set a timer that will time out after 30
> minutes if there have been no transmissions.
> Bob, WB4APR
> ---
> This email has been checked for viruses by Avast antivirus software.
> https://www.avast.com/antivirus
> _______________________________________________
> aprssig mailing list
> aprssig at tapr.org
> http://www.tapr.org/mailman/listinfo/aprssig

More information about the aprssig mailing list