[aprssig] Options for robust digipeaters

wa7skg wa7skg at wa7skg.com
Mon Feb 8 22:18:25 EST 2021

I would recommend the MoPi2 power board for your Raspberry Pi. This 
gives you two 7-24V power inputs, hot swap between power inputs when 
primary fails, charge port (like solar) to keep the backup battery 
charged, low voltage detect to gracefully shut down when supply voltage 
drops, one button start/stop on the RPi, 5V switched output to control 
relay or external equipment, etc. I use them on mobile and portable 
systems. Can mount with other HATs on the GPIO bus.

Michael WA7SKG

Jim (List) wrote on 2/8/21 1:24 PM:
> Hi,
> I’m looking for advice on current offering for a robust, 
> field-deployable digipeater TNC/modem.
> Over the years my go-to device has been the KPC-3+, mainly because when 
> I started out with APRS the sound-modem stuff was rubbish and not easily 
> deployed in the field without needing to be tweaked / set up each time. 
> The KPC-3+ is bomb-proof, out-performs most other hardware, low power 
> and just works (save for the known buffer/timing issues, but they were 
> solved in v9.1). I’ve never had one fail in 25 years (and I’ve had 
> wide-area event systems deployed with a dozen of them spread around the 
> hills!).
> The world has moved on and sound-modem stuff is now very good, so 
> looking at what options there are for something that has 
> multi-functionality - i.e. can be used at a centre or in a mobile for 
> situation awareness, perhaps over LAN/Wi-Fi with an appropriate 
> tablet/computer, used as an iGate, as well as “black boxed” with a radio 
> for the hilltop where it can be just switched on and left by someone 
> without any ARPS / computer knowledge.
> Units that would reliably handle 9600 would also be useful. Again 25 
> years ago that was a problem, but radios from the “big three” (and I 
> think some others) have the appropriate connections.
> So, any recommendations / thoughts?
> Jim
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