"Powered by your Rx"
Translates into, Plug the power cable to a 3.7 to 7.4 volt battery. Well, I read the voltage range it can accept, and it lists 3.7v (one Lipo cell or a Lithium Coin battery) to 7.4V (two Lipo cells in series). Of course it could also use three of four 1.5V batteries in series, for 4.5 to 6 volts, and other possible sources (like a 12V smoke alarm battery to a 5 volt 7805 regulator)
In the photo, the cable cord on the lower right plugs the white connector into the altimeter, and the black connector into a receiver. The black wire is ground, red wire Positive, and the white wires would not be used by that cable
It is interesting. That is darned lightweight, though without the necessary battery. Not certified for use in NAR contests, but otherwise it might be good for other flying (do not get me started in the botched mess of NAR altimeter certification for contests).
The 8 hz sampling rate is not that bad. A lot of rocket altimeters sample at 20 Hz, but except for detecting "launch", that 20 Hz sampling rate is not that critical. Well, if a person wants to really do extreme analysis of every data point for a flight, especially the fastest portions of the boost phase, it could matter. For the vast majority, not so much.
The company has shut down now (owner retired) , but for years Winged Shadow Systems sold the How High altimeter, aimed at model plane use. But the NAR finally did get around to testing it and accepting it for contest use. And for a year or two, Quest sold a version of the How High made for rocket use, it used big coin type battery to power it. IIRC, the How High sampled at something like 2 or 4 Hz. I used a couple of them, they worked nicely.
Anyway, the How High also was powered by plugging into a receiver, for the power source. With an optional add-on battery source much like the battery the Quest version had used. So, you might want to take a look at how it worked.
https://www.wingedshadow.com/howhigh.html
That one only reported the highest altitude, period. Although there was an additional piece of equipment, the "See How", that was able to download flight data that was stored, just not accessible any other way than using the See How.
- George Gassaway