Related Manuals for PreppComm DMX-40
Summary of Contents for PreppComm DMX-40
- Page 1 Making Communications Fun Again! QUICK START GUIDE By Eric C Anderson, PreppComm Version 3.0, August 2021 Copyright © 2020 PreppComm. All rights reserved . ...
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Page 2: Before You Begin
Transceiver on 40 meters. This is referred to as the "Transceiver Mode." In this use, you only need the DMX-40, the keyboard, a set of headphones or powered speaker, and an antenna (or dummy load if you are learning how to use it). Go to Section I below. ... - Page 3 Copyright © 2020 PreppComm. All rights reserved. I. Section I: QRP Mode Setup Set up the DMX-40 as shown in Figure 1 below. Do not apply too much force when plugging in the keyboard - make sure you have the USB plug correctly oriented and aligned.
- Page 4 Copyright © 2020 PreppComm. All rights reserved. Note: You can turn off the internal transceiver by pressing the frequency button until it says "External." This is what we refer to as External Mode, or Companion Mode, and is discussed in detail in Section II. Pressing it again restores transceiver function The Splash Screen will display for approximately 3 seconds, as shown in Figure 2 below.
- Page 5 Copyright © 2020 PreppComm. All rights reserved. FIGURE 4: MAIN MENU 4. Press the LOCAL STATION SETUP button at the top of the menu. The Call Letters entry screen will display, as shown in Figure 5 below: FIGURE 5: CALL LETTERS ENTRY SCREEN 5.
- Page 6 Frequency Button works (see Figure 3). The Frequency Button The DMX-40 can be thought of as two separate parts: the computer part, and the transceiver part. The computer portion is always active when power is on. When you see a frequency value in the Frequency Button, the transceiver section is also enabled, and the receiver or transmitter is active, depending on receive/transmit state.
- Page 7 7. Press CALL to start the directed call sequence. Note it will automatically use 20 WPM from recent history. 8. Watch as the DMX-40 calls the specified station. Press CALL again to end the sequence. Note that KN is appended at the end, which means "only the station I am calling, come back." ...
- Page 8 12. Type a tilde (~) character, then press ANS again. The button turns AMBER. 13. Watch as the DMX-40 sends the initial station ID, followed by the INFO microprogram, which is generated when you type in a tilde character. The Type- Ahead Buffer goes away as soon as the tilde is read out.
- Page 9 NOTE: For this section, you will need a real antenna, and the Frequency button should show a frequency value, not External. Press the button to switch to Frequency Mode, which turns on the transceiver inside the DMX-40. 1. Background Obviously, the first thing you need to do to tune in a station is... remove the dummy load (if you used one) and connect to a real antenna.
- Page 10 FIGURE 7: RECEIVE MODE KEYBOARD COMMANDS There is a large version of this layout in Appendix VI of the DMX-40 Reference Manual you can use print out and as a guide. For now, just note the following keys: a.
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Page 11: Volume Controls
Copyright © 2020 PreppComm. All rights reserved. 4. Volume Controls There are two separate volume or gain controls on the DMX-40. One controls the audio volume going to the headphone jack. The other controls the signal gain to the decoder. - Page 12 Copyright © 2020 PreppComm. All rights reserved. 8. When you first tune into a new station, with CW IN LED blinking, press the SPACE bar to restart the decoder. The decoder will start collecting data, and when it has enough, it will determine the sender’s speed and measure 5 different factors related to the specific style of the sender’s code.
- Page 13 Practice practice practice! There are two major areas to practice: 1. Operating the DMX-40: This is the easy part. Use the DMX-40 Reference Manual. There is so much more the DMX-40 can do we have not touched on. ...
- Page 14 ¼" plug on the end of its cable. Below are the cables you will need, Amazon product codes, and a cable number we will use in the setup instructions. Cable 1: KEY IN/OUT. This cable connects the DMX-40 KEY IN/OUT connector to two separate ¼" jacks. The...
- Page 15 9. Connect another stereo Cable #3 to the other side of Cable #2 Y, and plug it into the AUDIO IN jack of the DMX-40. 10. Check to see if there is activity on the TONE LED of the DMX-40 when you turn in noise or stations on your transceiver (you should also hear them on the powered speaker).
- Page 16 Copyright © 2020 PreppComm. All rights reserved. Page 16...
- Page 17 Basically, rather than a cable #3 going directly from Cable #2 to the powered speaker, it would go to one input on the mixer, and an additional Cable #3 would run from the headphone jack on the DMX-40 to a second input of the mixer. The mixer output would then connect to the powered speaker.
- Page 18 VI Operation in External Mode 1. Basics The tone that the DMX-40 is looking for is NOT 600 or 650 Hz, tones normally used for listening to CW. Rather, it is 1300 Hz. Why did we mess your ears over by choosing...
- Page 19 5. You will use your normal routine to transmit. Note it is a good idea to have a dummy load on the antenna connector of the DMX-40 so it will not pick up your signal. If it still picks up your signal, you have a serious issue with RF in your shack, and you need to attend to that.
- Page 20 Copyright © 2020 PreppComm. All rights reserved. 5. Operate the DMX-40 transceiver as if it is the controller, and operate your external transceiver as if it is merely a receiver and transmitter. In other words, you should be operating the external receiver controls, but not the transmitter controls, which...
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