Saturday, 6 September 2014

Metro APRS coverage declines

The primary APRS gateway (I-Gate) in the metro has been down for about a month now. That would be the W0YC-10 station at the University of MN, operated by the Gopher Radio Club. The problem is, per N0YNT (Matt), with the internet port. This is the same problem that has kept the EchoLink node on the 444.425+ from working for that same length of time.

Since I last wrote on this subject, the metro area has gained another gateway in the south-east (K0JDD-1), and lost another in the north-west (WX0BPR). The digipeater network has remained the same.

Remaining I-Gates in metro

Current metro-area digipeaters
If you've been thinking about setting up an I-Gate or a digipeater, this might be an opportune time to so -- at least until W0YC-10 is back in action. A nifty piece of hardware to make this possible is here. It comes with a cable compatible with Yaesu, Kenwood, and Icom transceivers, and it can work with a PC or Android phone. And you can always use it with UI-View to see APRS stations by RF alone (no internet). That makes it nice for emergency purposes.

It's often difficult to see the consequences from the lack of coverage. Users seldom check their path data, and their last position will remain when they move out of gateway coverage. 

If you are in one of the areas with deficient coverage, you might want to use additional power or set up your mobile as a digipeater to help out others. 

The loss of W0YC-10 also affects the VHF propagation data, as it was one of the consistently good reporters. By recording the path of APRS stations received, a gateway is a pretty good indicator of two-metre conditions. 

5 comments:

Matt Todd said...

If you want to know more about the KC0VRV (mine) i-gate here it is: Its mag mount on a pizza pan on the back of a couch running into an old radio shack scanner feeding UI-view. I originally set it up to provide coverage on my bike since my 5 watt handheld wasnt being heard. Obviously the antenna situation is the limiting factor as I have experienced about 5 miles in range on average.

Todd Dugdale said...

Well, you cover a nice stretch of 35W, judging by the path maps. The RX-only I-Gates don't show coverage circles, but APRS.fi shows the path maps for them.

What do you use as an interface between the scanner and the computer?

Matt Todd said...

It uses a sound card and AGW Packet engine.

Unknown said...

Just a quick update on the APRS/Echolink status at W0YC.

The cause was a security lockdown by the U network team. In order to stop doing the lockout dance every couple of weeks the W0YC team decided to scrap what was there and rebuild from scratch using proper and up to date solutions.
A new commercial firewall (not consumer grade) and managed switch have been put in service. The ACL structure was tightened down, thus preventing the port locks.
Just a side note, you've gotta be real careful when you actually have a full 1Gbps connection direct to the internet without any firewall or NAT solution in place!
Anyways, the network was replaced and 2 new units deployed to handle Echolink for the 444.425 repeater as well as the APRS digi/igate for 144.390. The new units are single purpose Raspberry PI based with custom PTT circuits and a ton of custom programming/scripting to make them stay up and running without intervention...we'll see how this goes although both went through a 2 week burn-in period without failure.
The new APRS and Echolink units are now online and operational.

Todd Dugdale said...

Sounds like a lot a lot of work, Ryan!
I noticed the APRS gateway was back online this week when I was checking VHF propagation.
Thanks for the update, and thanks for getting both the EchoLink and APRS restored.

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