I picked up a used Vertex/Yaesu VXA-710 for $150 on ebay last summer and have been very happy with it. I primarily use it in a J-3 with a headset adapter and PTT button, either directly to a Lightspeed Zulu headset or through a Sigtronics SPO-22 intercom. The 710 is a fairly basic radio that includes presets and VOR capability, though I've never tried the latter. The previous version also worked as a ham radio, but unfortunately they dropped that in the 710 and just support aviation radio, weather radio, FM radio, and "business radio".
With just the standard whip antenna, I get decent reception and transmission up to around 5-10 nm out, though sometimes I need to turn broadside or hold the radio out the door to pick up AWOS (I think the engine block blocks it). It doesn't work well much further than that, though it would be adequate in an emergency. I called a tower once to fly through their class D and was told "we can barely understand you. Click once if you want to land, click twice if you want to overfly". I've heard it is much better with an external antenna.
You will have to be careful about cable routing though, especially in a small cockpit. If one of the wires to the headset runs alongside the antenna (instead of going out perpendicular to it), you get fairly bad feedback squeal every time you transmit. I've come up with a system of putting the radio in the seat back pocket and routing the cables a certain way, but it falls out of position and I'll get the squeal sometimes.
Before the VX710, I bought an Icom A14, but had severe issues with feedback squeal every time I hit the PTT button no matter what how I routed the wires. There is some discussion online about how to fix this with common-mode chokes or impedance-matching transformers on the cable and I know of at least one local person who has made it work, but I didn't want to deal with the hassle, so I just returned it. I think the story is that Icom used an input amplifier that does not adequately load the low-impedance mics used on aviation headsets. The A24 has the same problem, but I have been told that A3/A22 and previous radios do not (and the datasheets suggest that that is the case, as the input impedance is 150 Ω for the old units, >100 kΩ for the newer ones).
Icom is definitely ahead of Yaesu in user interface design. The unit I have has a horrible interface with very confusingly labeled buttons and I sometimes forgot how to use it and just have to press buttons until it gets into the mode I want. The newest generation of Yaesu radios they were demoing at EAA last week are vastly improved.
I should also say that Yaesu has extremely good support. The rep at EAA is super nice and extremely knowledgeable about all aspects of their product line - aviation, marine, and amateur. The last two years I stopped by their booth at EAA with questions, I walked away with free stuff - headset adapter cables, chargers, hats, etc...
Ethan
Last edited by
FlyWI on Tue Aug 05, 2014 11:22 am, edited 1 time in total.