[OZAPRS] Receive only iGates

[Bradley Clayton]

Hi Norm, Liz and Graeme

Thank you for your comments and encouragement!

I don’t foresee any risks like transmitting loops but thought I’d just check with those who’ve played in this space already :) 

Norm, it sounds like your setup is very similar to mine, currently Direwolf on a laptop computer. I’d like to move mine to a Pi and also implement a ‘full service’ as you did, if it proves valuable in my area.

Liz, that’s right, I’m in the Brunswick area which has some Digipeater coverage if I’m on the roof of my double story unit but I’ve not been able to get any packets to traverse the network from ground level.

Graeme, thanks for your point, too. I found that the APRS-IS code is open source and you can see the code that implements exactly what you describe - there can be multiple paths to stations via I-gates. So an RX only I-gate won’t restrict messages going back to a station if it’s been heard by other RX/TX I-gates. If you’re interested it’s on line 2467 here: https://github.com/hessu/aprsc/blob/f8824e85f7d67661bd90fbbf0929aa1a9c4a947a/src/filter.c

Thanks again,

Brad


> On 27 Jan 2021, at 9:44 am, Norm McMillan <vk3xci at gmail.com> wrote:
> 
> Brad,
> Go for it, it's a lot of fun and that is what Ham radio is all about! The A correctly configured APRS network will take care of "loops" as you call them
> 
> I ran a Raspberry Pi Zero/Direwolf RX only iGate here in Mildura for quite some time, using an SDR dongle. I had some reliability issues and reverted to the "full service" version simply because I had it all set up. Uses an RPi 3B+, Xastir, TNC2 and a Motorola Transceiver. I'll eventually build it into a  Pi0/Direwolf/Baofeng full service iGate, but meanwhile ,like Isaid, it's fun.
> 
> Don't worry about naysayers who tell us that rx only iGates Break the APRS messaging system... that's ancillary to the main objective of APRS. Any iGate is better than none and getting a posit on APRS-IS is the main purpose....
> 
> Have fun.
> 
> 
> 
> de Norm VK3XCI
> Website: https://vk3xci.wordpress.com/ <https://vk3xci.wordpress.com/>
> Club site: http://sunradio.org.au/ <http://sunradio.org.au/>
> 
> 
> 
> On Tue, Jan 26, 2021 at 5:29 PM Bradley Clayton <bradley at squarepolka.com <mailto:bradley at squarepolka.com>> wrote:
> Hi all,
> 
> I hope you're well. 
> 
> I'm experimenting with Direwolf and the configuration for a receive only
> i-Gate - RF to Internet only. I wanted to reach out to ask
> if there are any concerns or considerations for this configuration? Just
> want to make sure this approach doesn't cause loops or any other adverse
> affects on the network?
> 
> I hope this is an OK place to ask, and thanks in advance.
> 
> Cheers,
> Bradley
> VK3LIT
> 
> -- 
> Bradley Clayton
> bradley at squarepolka.com <mailto:bradley at squarepolka.com>
> https://bradleyclayton.com <https://bradleyclayton.com/>
> https://keybase.io/bradleyclayton <https://keybase.io/bradleyclayton>
> -
> 
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