I use an Easy Digi interface between my Icom IC-2300, Direwolf & APRX. Here is my PTT string for my direwolf.conf file for Push To Talk:
DEVICE plughw:1,0 ACHANNELS 1 CHANNEL 0 MYCALL MERIDN MODEM 1200 #IC-2300 PTT /dev/ttyUSB0 DTR RTS AGWPORT 8000 KISSPORT 8001 FIX_BITS 0 LOGDIR /var/log/direwolf/
Boise APRS Coverage Overview
SHAFER provides reliable coverage along I-84 from Mountain Home to Ontario, OR. To the south, most of the valley including the northern face of the Owyhees. And to the north, sporadic coverage in the mountains and along Hwy 55 to Horseshoe Bend.
Near Cascade, SNOBNK provides broken coverage in the Boise mountain range and along Hwy 55 from Smith’s Ferry to McCall. To the west, it covers I-84 in Oregon as far as Ontario.
In the Boise area, MERIDN Fill-in digi provides coverage along the foothills and in town. MERIDN IGates all traffic, but only digipeats over the air if MERIDN hears it direct *AND* mountaintop digi’s don’t digipeat the beacon (using APRX’s “viscous-delay” feature, set to 5 seconds). This prevents MERIDN from adding noise unnecessarily.
CNABAR, previously in the Owyhees to the south, will hopefully return at some point to provide coverage down Hwy 95 and into eastern Oregon.
Recommended Path Settings
For Handheld Radios (HTs)
WIDE 1-1,WIDE 2-1
The first path is for fill-in digi’s. The second path is for mountain-top digi’s. Central and southern Idaho has enough IGates and wide coverage that one mountain-top beacon is usually sufficient to get your packet to the Internet.
For Mobile Operators
Same as HTs, this will get you beaconed by fill-ins, plus one hop from mountain tops, which will usually get you gated to the Internet. If you use WIDE2-2 in the Treasure valley, your beacon will likely hit SHAFER, then SNOBNK (into McCall) and BKRCTY (into La Grande). If you need direct receipt of your packets that far away, just realize you are lighting up several mountain digi’s to accomplish that.
For Base Stations
If you are beaconing from a fixed location in the Treasure Valley within earshot of SHAFER, I recommend using the path WIDE2-1. No fill-in digi path needed. One hop from SHAFER will certainly get you IGated.
For High Altitude Balloons
(Don’t specify a path)
If your beacon will originate higher than ~10k ft, then you don’t really need any digipeater path in your config. It will be heard by multiple IGates and routed to the Internet. If you are (rightfully) concerned about when it drops below average terrain, then see if your tracker has the feature to change the path based on altitude.
At MERIDN, I have elected to IGate all balloon packets, but not digipeat them. On multiple occasions, balloons have passed over at 70k ft using a WIDE2-2 path every 30 seconds and as a result have caused congestion for hundreds of miles. With that altitude, they can be heard from Vancover to Vegas to Salt Lake City.
A Note to Fill-in Digipeater Operators & Tinkerers
Thanks for providing this service. The SHAFER digi has good coverage for most of the valley, but much of the foothills are in its shadow. Users on the southwest side of the Boise mountain range need help getting their signal out. However, for a long-term configuration, I recommend you use the “viscous-delay” feature from APRX so you aren’t repeating packets already beaconed from SHAFER or other digi’s. As an alternative, if you’re using Direwolf, you can set it to only digipeat WIDE1-1 packets.
I often hike & bike near Boise with my HT set to beacon. Sadly, in my experience, 5 watts is not sufficient for most packets to get IGated, even if you feel like you can see the mountaintop digi for most of the outing. Yes, some get through, but I wouldn’t count on much of your journey getting tracked. Anecdotally, it seems better to just stop near a summit, do a manual beacon and listen for your repeated beacon to be sure something went out.
It’s pretty easy to clone a Raspberry Pi SD Card on a Mac, but takes a LONG time (32GB took 3 hours to backup and 10 hours to restore via my iMac).
I recently bought a Kenwood TH-D74 for hiking and APRS use. I had seen anecdotal complaints about the battery life around the web, but had not seen any real world data. So I setup a test and timed the battery performance.
I started with a fully-charged, stock 1800mAh battery.
- Both bands enabled
- A Band set to 146.52
- B Band set to APRS
- Both Bands on HIGH power (photo was taken later)
- Beacon set to Auto, every 10 minutes
- Did not transmit on A (voice) band at all
- Bluetooth set to OFF
- Backlight set to OFF. Well, actually MANUAL (was turned on a total of 15 seconds to check battery levels throughout the day)
- GPS power set to Auto
- Very few (if any) beacons received
- Firmware 1.06
In short, nothing major was draining the battery other than the APRS beacon.
Result: 8 hours
I’m always looking for better APRS coverage.
I’ve had a Tram mag mount on my 2014 Subaru Forester for two years. Of course, everyone recommends drilling a hole in your roof instead. Most everyone claims they can hit repeaters they’ve never been able to hear after permanently mounting their antenna. I don’t doubt their claims, but my experience for APRS is slightly different. My hope was, after changing from the mag mount to the drilled hole, many APRS dead spots would be reduced or eliminated. Read on for the details.
The old setup:
- Tram 3″ Mag Mount
- 1/4 Wave (19″) 2M Antenna
- Placed on the very back of the roof, centered
- Yaesu FTM-350 Radio
I operate a Fill-in digipeater near Boise, Idaho, so I am using that as my reference point.
- I can clearly see where my packets are heard via APRS.fi to compare before and after.
- Better still, I know from considerable experimenting, where the dead spots are in my area.
- But, it is worth noting that APRS packets are more picky and less forgiving than a voice QSO.
DIY vs. Paying A Pro
I strongly considered drilling the hole myself. There are lots of tutorial videos on YouTube that show you how. I would either need to remove the entire headliner, or figure out how to snake the cable half-way up the vehicle, bypassing a large sliding sunroof. After about 8 hours of research over several months, I decided to pay my local two-way radio shop to do it for me.
- Cost: $85 (for materials and labor)
After about 24 hours of testing, I can only see about a ~10% improvement. One area that is normally sketchy received a solid beacon. The other 8 or 9 areas are no different than normal. These are not far-away places… just sections of town that might be slightly lower or obscured in some way.
Replacing the 1/4 wave with a 5/8 wave with higher gain.
Like most folks, I use APRS.fi for most of my APRS needs.
But a friend recently made me aware of a new website that also plots APRS packets on Google Maps, and I like it even better for some scenarios:
Check it out and let me know what you think!
73 de K7KEZ
If you’re passing through Boise on I-84, you’ll have about 30 miles of good iGate and digipeater coverage. Coverage from Boise south to Mountain Home is not very good.
Most of the metro area is also covered, but you’ll need 10 watts and an external antenna for the best reception.
As you zoom out a bit more, you can see the gaps in coverage from Mountain Home to Boise, and also from Ontario to Baker City.