I finally got around to buying a Kantronics TNC (KPC-3 Plus) so I could fiddle with FM packet, and was considering how to build a go-box with internal battery power for a spare FT-7900 that I’ve had sitting around (it used to be in the car before I replaced it with the TYT TH-9800) and the new TNC.
So looking around the web for some examples, I found this: VHF/UHF Go-Box Complete
It’s a nice build, but it has features I don’t need, and lacks other features that I do need. For instance, I don’t see the point of having the internal line-voltage power supply when you can feed the box from the PowerPoles. NHA also doesn’t really explain how he gets the line voltage power into the dry box. One assumes that if he’s added a connector for that on the outside of the box, the box is no longer waterproof (or he’s RTV’d the heck out of it). Of course, with all the holes cut into the lid, even under the hinged cover, it isn’t really 100% waterproof anyway. I’d just prefer not to violate the integrity of the box itself.
Since I can charge the batteries through the PowerPoles with my little float charger, or hook the whole thing up to a car battery, dedicated battery box, or external power supply ditto, I’m not going to bother with the line voltage supply. That removes a couple of switches and makes room for a DB9 connector for the TNC, which will be inside the box with the radio. Otherwise my build will look a lot like his. I admit that I’m not sure why he used a TH-9800 for this, unless he’s planning to tote 6 and 10 meter antennae around with him. My plan is to use a Slim Jim J-pole with the radio and TNC. I’ve already been using that setup in the shack with the Slim Jim tacked up to the wall, so I know it works.
I’ll have more on that as the build progresses. I’m still gathering parts at the moment 🙂