I don’t think I ever used the CP3’s 6v outlet to power my RN-270. But I did use it to power an old StarGPS. The newer StarGPS units are now self-powered.
I’d have to look at the RN-270’s detailed specs to see if the mount’s 6v power supply would work, but I’m almost certain it would work. Heck, if two AAA batteries will work, a good solid 6v power source sure should.
I can check, but I’m about 99% sure the RN-270 is also center-positive. I can also check if necessary, but I think the RN-270’s external power socket is also 3.5mm. It’s smaller than 5.5mm.
P.S. There is a Win-10 version of COM2TCP, so they’re still selling it. I also have one of the SkyFi-III serial to WiFi devices – and it does indeed work with everything I’ve got. But I usually only use WiFi in the field for outreach events. And WiFi is becoming a problem at the large events because so many mounts are now using it – and so we’re beginning to run into interference and not enough available channels problems. Just ask anybody who’s tried to use WiFi at the Grand Canyon Star-Party. And for those reasons, I prefer Bluetooth.
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Thank you, Woody for the detailed info.