This is going to require more than a cable, if it can be done at all. I take it that you want to access the phone's GPS and somehow take that signal and use it to key up the transceiver. First of all, I don't believe that the iPhone's GPS data can be output through the headphone jack. I have developed apps that used the phone's GPS (and the accelerometer). However, they only displayed values on the screen. Could they have transferred data using the Lightning port to another device? Possibly. Could they control the PTT on the radio? Unknown to me.
The better solution would be to get a Yaesu radio with a built in GPS. The FTM-300 and 400 are examples. In the handheld area both the FT2 and FT3 can do this. That way you use the B band as the APRS and you can talk on band A. I don't believe that the 7250 can be configured this way even if it had a GPS or was connected to an external GPS. By the way, that device would probably connect to the data port on the radio not the mike jack.
Perhaps someone else has a magical solution and I don't know what I'm talking about.
Hello ko6jw_2,
My current setup that works is a 3.5mm plugged stereo cable from my iPhone X, running the aprs.fi app, to the microphone port of the Baofeng BF-F8hp. I don't have the Baofeng APRS cable but I can track and send text messages with the setup.
I thought I'd better try and see if that'll work with my Yaesu FTM-7250DR because I go to the desert frequently and the additional power of the Yaesu will allow me to reach out compared to the HT.
Was able to talk to a ham friend of mine and he said to use only 2 of the pins, connect the mic pin to the tip of stereo plug and the ground pin to the base of the stereo plug. I guess I can give it a shot and see and hope that I don't fry anything.
Yes the FTM-300/400 are really nice radios and would be much easier to use. Maybe next year.
Thanks for the reply and will keep you posted.
