![]() Typically I like to put an audio isolation transformer between the radio and the sound card, but this "shortcut" method will get you on the air. ![]() Always helps to have another friend that is running FLDIGI to start making the correct adjustments. If you go too low, the PTT won't engage or you won't see another station's signal on your waterfall. Same will be true if the microphone level is too high. Be careful not to overdrive the output, or you will get a distorted waterfall. Test by speaking into the HT and adjusting accordingly.Īfter you get everything plugged in, start adjusting your sound card microphone and audio out levels. All you need to do is turn the VOX function and set the VOX level to a comfortable speaking level. The 3.5 mm Baofeng connection (microphone) is connected to your sound card audio out or speaker connection.Īll of this completes the plumbing, but what about push-to-talk? That is the easiest, as Baofeng includes a "VOX" function that will key the transmitter whenever a certain audio level is detected on the microphone. You end up connecting the 2.5 mm Baofeng connection (audio out) to your sound card microphone or line-in connection. Four pole adapters will not work with the Baofeng. It is important to note that both adapters are 3-pole (meaning there are three sections, two black rings). The other is a 2.5 mm to 3.5 mm adapter, which can easily be found on. I used two male to male adapters to complete the connection between the Baofeng HT and a SYBA sound card. 2.5 mm is a non-standard size and is typically only used on cell phones. ![]() It is also the size used by most computer sound cards for either microphone or audio out. The two connectors are designed to be plugged into a "remote" mic that can be placed on your shirt or belt buckle.ģ.5 mm is the standard "1/8 inch" audio connector size that we use for consumer electronics, such as MP3 players. The Baofeng HTs have a 2.5 mm female connector for audio output (speaker) and a 3.5 mm female connector for microphone. Thanks for the generosity of Scott KD5NJR for letting me try out my idea on his HT pair. The new version of Arduino (1.Had to "experiment" with a super-simple Baofeng HT FLDIGI station. I will be using it a lot and improving on it, but of you have any improvements, feel free to drop them in the comments. Obviously, I had to make a custom cable to go from the 8-pin round connector on my rig to the computer’s mic and phone jacks and the Arduino breadboard (well, breadboard for now). Basically, the transistor acts as a solid-state relay.Īs you can see from the sketch, most of the lines are to blink the LED (and this could be done with much fewer lines with two for loops). That allows current to go through the transistor and complete the circuit for the PTT switch. The sketch is really simple as all it does is respond to the correct string from the serial input and turn on the LED and send some voltage to the transistor base. ![]() It will be the same address you use to upload the program to the Arduino. In fldigi, the setup in Configure – Rig control should be like below, but make sure the device is the correct address for the Arduino Uno. This is done by putting the rig.xml file (Arduino.xml) in a good location, such as ~/.fldigi. The first thing to do is setup fldigi to communicate with the rig. It was actually pretty simple, although I did have a little bit of trial-and-error with the rig.xml file. I did this via an Arduino Uno and a transistor and a rig.xml file. While I can easily connect the mic and speaker to the computer, switching the PTT requires something to get a signal via USB (that something can read) and activate the PTT. My problem is that I have a MacBook Pro (no serial port) and an HTX-100 (no computer connectivity whatsoever and no VOX). Or, you need an old computer with a serial port to trigger the push-to-talk (PTT). It seems to me the way things are, the ways to run digital soundcard-based modes involves either a new rig and a new (enough) computer with a USB port. ![]()
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