This page automatically converts the letters of your callsign to your two-key DTMF sequence, and it even computes the checksum digit for you.

Now that you know both two-key DTMF sequences for your callsign, you will want to save your APRStt callsign sequence to one memory location of your radio and save the abbreviated APRStt callsign suffix into a different memory on your radio. This shorter version can be used on an APRStt system AFTER you have first sent your full two-key DTMF callsign once. Exactly how you set up and use the DTMF memories will depend on the particular make and model of your radio.

Here's some step-by-step instructions. If you have instructions for YOUR particular radio, please write up the instructions and send me a copy. I will add them to this page and give you credit.

• Radio Shack HTX-202
• Alinco DJ-G7

To manually send a DTMF sequence, press and hold the PTT button, then press each key for each DTMF you want to send. Please note that if you want to send a DTMF 'D' then you must press the 'D' key TWICE. However, you will probably want to store your callsign into one of the HTX-202 DTMF memories so that you can quickly send your callsign at any time. Let's say you want to store your callsign in DTMF memory #1. Follow these easy steps:

1. To start, turn on the radio and press both the "F" key (it's on the side, at the top, above the PTT key) and the "2" key and hold them both down together for at least one second.

2. The LCD display will change to show that you are now programming DTMF memories. It should say "d1 - - - - - -" if you don't already have something in the first DTMF memory. If you already have something stored in the first DTMF memory, then it will say "d1" followed by whatever is stored there (you will see the DTMF letters and numbers after the "d1".)

3. Enter your APRStt two-key DTMF callsign from this page starting with "A" and ending with the "#" key. For example, if your callsign was WB4APR and the overlay that you wanted was "7" then your two-key DTMF sequence is "A9A2B42A7A7C71#". Remember that you have to press the "D" key twice if you want to enter a single "D". Also, when you press "#" it will appear on the LCD as "F". If your APRStt callsign is fifteen letters long, then the HTX-202 will beep as your press the final "#" key. That's ok.

4. When you have finished typing all of the DTMF digits, press the PTT button on the side of the radio.

Now, whenever you want to send your callsign on an APRStt channel just follow these steps:

1. Press and hold down PTT.

2. Press the "D" button once.

3. Press the "1" to send your callsign from DTMF memory #1.

4. Release PTT.

Note 1: If you have the "auto-reply" feature configured, then your HTX-202 will still be transmitting after you release the PTT (in step 4) and you will have to press PTT again to stop transmitting. If don't like having to do this, change the "auto-reply" feature by following these steps:

1. Press "D" once.

2. Press and hold "F" and while holding "F" press "M-SET" ("M-SET" is "8").

3. The menu appears. It will probably say "oS 0.600". Press "#" until the left word shows as "Ar".

4. Rotate the "TUNE" knob on top of the radio one click to change the setting.

5. Press PTT to save and exit.

Note 2: The HTX-202 can send DTMF digits at two different speeds (fast and slow). You can change between the two speeds by pressing and holding PTT, then press "D" once, then press the zero button. To change back to the way it was, do the same thing again (press and hold PTT, then press "D" once, then press the zero button.)

Using the Alinco DJG7 HT with APRStt

To manually send a DTMF sequence, press and hold the PTT button, then press each key for each DTMF you want to send.

You will probably want to store your callsign into one of the DTMF auto-dialer memories so that you can quickly send your callsign at any time. Let's say you want to store your callsign into memory #1. Follow these steps:

1. To start, turn on the radio and press the "FUNC" key (it's on the front at the bottom left) then release "FUNC" then press down on the dial on top of the radio. This will let you get to the menus on the radio. You might already be on some lower level menu setting. We want to first get to the top level menus, which are displayed with "<" and ">". If you don't see a word surrounded by "<" and ">", then press the "MONI LAMP" button on the left side of the radio (below PTT and above the circular power button).

2. Once you see a top level menu with "<" and ">" then rotate the knob on top of the radio until you see <DTMF> and then press the knob on top of the radio.

3. The screen should show "Auto-dialer 1" and the bottom line will display the contents of this auto-dialer memory location. If you wanted to store your callsign into a different memory location, then rotate the lower ring of the knob on top of the radio until you see the number of the memory location you wanted.

4. You should see a flashing underline as the cursor. Enter your APRStt two-key DTMF callsign, overlay, and checksum starting with "A" and ending with the "#" key. For example, if your callsign was WB4APR and the overlay that you wanted was "7" then your two-key DTMF sequence is "A9A2B42A7A7C71#".

5. When you have finished typing all of the DTMF digits, press the PTT button on the side of the radio.

Now, whenever you want to send your callsign to an APRStt engine just follow these steps:

1. Press and hold down PTT.

2. Press the "FUNC" button once. You will see a little "D" appear on the top center of the LCD.

3. Press the "1" to send your callsign from DTMF memory #1 (or press the number for the DTMF auto-dialer memory that you selected in step #3 above).

4. Release PTT. The radio will send all of the DTMF digits in that memory location.