Kenwood TM-D700 digipeating my Yaesu VX-8

While I'm very happy with my new Yaesu VX-8, I have noticed that even with an antenna better than the OEM, I rarely get my APRS signal into the local digipeaters. Well, today, that problem got solved. I set my truck's Kenwood TM-D700 to digipeat the VX-8 and it worked perfectly. Yes, I had a little path duplication that is now taken care of, but now the signal flow nicely. Of course, the purists will see a runner going quite faster than humans can, but with today's weather (rain and wet snow), I simply used it from inside the truck.

I now have a working system for SAR or other purposes where my VX-8 signal is digipeated by my truck and can be picked up by my Kenwood TH-D7ag/Garmin CSx at base etc. I can even leave the D7 on its charging stand and not worry about batteries going down.

The next step? Connecting the D7 to my laptop.






I've also noticed that I prefer having the GPS affixed to my radio and not use the remote mike. The package is much more compact without the dangling mike, with the GPS in a place where sooner or later it will get banged hard. In addition, APRS needs to be supervised to look for messages, etc., so I have to look at the display anyhow. For now my VX-8 is configured as in the second picture.


So what can you learn about me through APRS? Well below is a Google map you can access through the links of this blog. It will not always be the same map, depending on where I went and if I turned the system on. But here it is. You may notice that the lines do not do right on the roads. This is simply because they join points taken at two minutes interval, if there was reception and do not show exactly where my truck went. Being a Google map, you can also flick it to the satellite picture, well the real think, not the screen dump I put here.

And finally, you can see the data, mainly the last coordinates, the date and time, first and last heard and the location details.

Try it, either on this blog or on my website.

My new Yaesu VX-8R radio/APRS

This is my new Yaesu VX-8R radio, A small but rugged and waterproof handheld which has a built-in GPS chip in its speaker mike and not only displays my location (in lat/long, WGS 84) on its screen, but can also send it via APRS, to the entire world, given it can reach an internet gate (i-gate).

If its transmissions make it to an i-gate, my position can be checked on several websites including my own K9CHP. Just scroll down to the Where am I page.

But even if I am truly hiking in the boonies, my VX-8R can transmit my position to my truck where it will be kept both on the Kenwood TM-700a mobile radio and the Garmin 60CS GPS. The TM-700a is now out of production and has been replaced by the RC-D710

Another possibility is to use my Kenwood TH-D7AG handheld radio that can be connected to my Garmin 60CSx GPS. This is the seup shown below. I trd using it in the field but the radio is fragile and not waterproof, so you have to protect it a lot and the connecting cable not only tends to get snagged but disconnects quite often, so the entire setup is of questionable field value. But it can be left at base and now they can have a precise idea of my whereabouts and anybody elxe using APRS in that area.

I can also connect the TH-D7AG/60CSx to a laptop and have the locations appear on screen. But the software I use needs internet connection to work at its best, so it won't be functional everywhere. The TH-D7AG is now out of production.





And here you can see how my location looks like on the GPS screen. The blue flag is the last waypoint received. I did change the scale to a large display so the new waypoint will be distinct from the existing ones. But even if it is not clear enough on screen, find waypoints near current location will give the desired results.

I hope to put the system into use in SAR training with Eagle Valley Search Dogs. The nice thing is that the VX-8R can be used by a person without an Amateur Radio licence as it is a simple remote APRS beacon and I will be its control operator. The person carrying it will not have access to any function other than turning the unit off, if so requested on our SAR network.