Tag: Digital Modes

  • Winlink Made Easy: Installation, Configuration and Your First Message

    Winlink Made Easy: Installation, Configuration and Your First Message

    NJ2RQ Icom IC-7300MK2 amateur radio station

    Winlink Global Radio Email lets licensed amateur radio operators send and receive messages through the Winlink system using either the internet or radio. It is especially useful for emergency communications, field exercises, portable operating, and situations where ordinary local communications are unavailable. The easiest way to learn it is to begin with Telnet, confirm that your account and software are working, and only then add the radio connection.

    This guide focuses on Winlink Express on Windows and the most common beginner paths: Telnet, VARA FM for VHF/UHF, and VARA HF for HF.

    What You Need

    • A valid amateur radio license and your callsign.
    • A Windows computer for Winlink Express.
    • Winlink Express, downloaded from the official Winlink site.
    • For radio use, a compatible transceiver and an audio/PTT or USB interface.
    • For VARA sessions, the separate VARA HF or VARA FM modem software.

    Beginner tip: do not start by troubleshooting the radio, sound card, CAT control, PTT and Winlink account all at once. Set up Winlink Express and prove it works with Telnet first.

    How the Winlink System Works

    Winlink Express is the client program on your computer. When you use Telnet, it connects to the Winlink system through your normal internet connection. When you use radio, your station connects over the air to a participating Radio Message Server, or RMS. That gateway passes your traffic into the Winlink system.

    The important point is that your station does not need a local internet connection when you are using an RF session. You need a radio path to a suitable RMS. The gateway and the wider Winlink network handle the rest. Specialized radio-only and contingency configurations also exist, but they are beyond the scope of this beginner guide.

    Which Radio Setup Should You Use?

    Goal Typical Setup
    Learn the software Telnet Winlink — no radio required
    Local or regional VHF/UHF FM transceiver + audio/PTT interface + VARA FM
    Longer-range HF SSB HF transceiver + USB/sound interface + VARA HF

    A handheld can sometimes be used for VHF/UHF Winlink, but a mobile radio is often easier and more reliable for sustained digital operation because of audio interfacing, transmit duty cycle and stable power. On HF, a modern transceiver with built-in USB audio can simplify the setup considerably. External interfaces such as a DigiRig or SignaLink can also work well when matched correctly to the radio.

    Step 1: Download Winlink Express

    Download the current Winlink Express installer from the official Winlink download area at downloads.winlink.org. Extract the ZIP file and run the installer.

    Winlink Express normally keeps its working files under C:\RMS Express. Using the normal installation choices is the simplest approach for most operators.

    Step 2: Complete the First-Start Setup

    When Winlink Express opens for the first time, complete the setup form carefully. Enter your amateur radio callsign, a Winlink password, your password-recovery email address and the other requested station information. If you know your Maidenhead grid square, enter it as well.

    This is an important correction to some older instructions found online: with current Winlink Express, you should enter a password during initial setup. Do not intentionally leave the password blank while waiting for a temporary password. Winlink’s current account instructions say to enter your password and recovery address, then click Update to create the account.

    Winlink’s own account instructions are available at winlink.org/user.

    Step 3: Test Everything With Telnet

    Before connecting a radio, test the basic installation:

    1. Open Winlink Express.
    2. Choose Telnet Winlink from the session drop-down.
    3. Click Open Session.
    4. In the session window, click Start.
    5. Watch the session log for a successful connection.

    If Telnet works, you have already proven that Winlink Express, your callsign, your password and the network connection are functioning. If the later radio session fails, you can concentrate on the radio side rather than wondering whether the entire installation is wrong.

    Step 4: Send Your First Message

    1. Click New Message.
    2. Enter the destination address.
    3. Add a short subject.
    4. Type a brief test message.
    5. Click Post to Outbox.
    6. Open a Telnet Winlink session and click Start.

    The message in the Outbox will be transferred during the session. Once you are comfortable sending and receiving through Telnet, you are ready to add radio.

    Step 5: Add VARA FM for VHF/UHF

    VARA FM is a separate modem program. Download the current release from the official Winlink-hosted VARA directory at downloads.winlink.org/VARA Products.

    You will need to select the correct input and output audio devices in VARA FM and configure a PTT method supported by your station. Depending on the radio and interface, PTT may be handled by CAT control, a serial RTS/DTR line, VOX or another supported method.

    In Winlink Express, choose a VARA FM Winlink session, configure the radio and VARA settings, select a reachable RMS, and connect. Start with conservative transmit audio. Too much audio can distort the signal and make an otherwise strong path impossible to decode.

    Step 6: Add VARA HF for Longer Range

    VARA HF works on the same general principle but uses an HF SSB transceiver. Select the correct radio control method, COM port if required, sound-card input and output, and PTT configuration.

    Keep the transmitted audio clean. On an HF radio, excessive audio drive and ALC can reduce the quality of a digital signal. Use enough RF power to make the path reliably, but do not try to compensate for poor audio settings by simply increasing power.

    VARA Free vs. Licensed

    VARA can be used without purchasing a registration key, but unregistered operation is speed-limited. A VARA license unlocks higher speeds. You can learn Winlink and make working connections before deciding whether the higher-speed VARA license is worthwhile for your station.

    Finding a Gateway

    Winlink Express can obtain lists of RMS stations for the session type you are using. Choose a gateway that supports the mode you have configured and that is appropriate for your location and propagation conditions.

    For VHF/UHF, the most important factor is usually whether you have a usable local RF path. For HF, band conditions, time of day, distance and antenna efficiency matter. If one gateway does not work, that does not automatically mean your station is misconfigured.

    Common Problems

    Telnet Does Not Connect

    Check the callsign, password, internet connection and security software first. Fix Telnet before moving on to RF troubleshooting.

    VARA Opens but the Radio Does Not Transmit

    Check the selected PTT method, COM-port assignment, CAT settings, cabling and interface configuration.

    The Radio Transmits but the Gateway Does Not Decode You

    Check transmit audio level, the correct sound-card device, frequency, mode, bandwidth and whether the chosen gateway is actually reachable. Excessive transmit audio is a common cause of failed digital connections.

    VARA Cannot Find the Audio Device

    Windows may have renumbered or renamed a USB audio device. Recheck the input and output selections in VARA after reconnecting USB equipment.

    A Simple Learning Plan

    1. Install Winlink Express.
    2. Create and verify your account information.
    3. Complete a successful Telnet session.
    4. Send a short message by Telnet.
    5. Install either VARA FM or VARA HF.
    6. Configure audio and PTT.
    7. Connect to a suitable RMS.
    8. Send the same type of short message over radio.

    That sequence keeps the learning curve manageable because you are changing only one major part of the system at a time.

    Where to Go Next

    Once the first connection works, practice before you actually need Winlink. Try sending a message, receiving a reply, reconnecting after restarting the computer, and repeating the process without notes. Emergency communications tools are most valuable when the operating steps have become familiar.

    If digital radio is new to you, you may also enjoy DMR Made Easy and my overview of repeater linking and radio-over-internet systems.

    Bottom line: start with Telnet, prove the account works, then add the radio path. That one habit eliminates a large amount of unnecessary troubleshooting and makes Winlink much easier to learn.

  • MMSSTV: An Easy Way to Get Started With Slow-Scan TV

    MMSSTV: An Easy Way to Get Started With Slow-Scan TV

    Want to send pictures over amateur radio using nothing more exotic than a Windows PC, a sound-card connection, and your transceiver? MMSSTV is one of the classic ways to get started with Slow Scan Television, or SSTV.

    SSTV does not send moving television. Instead, it converts a still image into audio tones that fit inside a normal voice-width radio channel. Another station receives those tones and reconstructs the picture line by line. It is a simple concept, but seeing a photograph appear out of the noise is still one of the most satisfying things you can do on the amateur bands.

    What is MMSSTV?

    MMSSTV is a Windows SSTV program written by Makoto Mori, JE3HHT. It uses a computer sound device to receive and transmit SSTV audio and supports many familiar SSTV modes, including Martin, Scottie, Robot and PD modes.

    The official MM HamSoft site currently offers MMSSTV version 1.13A. That release dates from 2010, so this is mature, classic ham-radio software rather than a newly developed Windows application. It is still widely referenced and remains available from the official site. MMSSTV has also been released as open-source software.

    Download tip: use the official MM HamSoft page rather than a random software-download site: MM HamSoft — MMSSTV.

    What do you need?

    For basic receiving, the setup is straightforward:

    • A Windows computer.
    • An amateur-radio receiver or transceiver.
    • A way to route receiver audio into the computer.
    • MMSSTV.

    For transmitting, you also need a way to route computer audio back into the radio and a reliable method of keying PTT. That may be handled by a radio’s USB audio interface, a dedicated sound-card interface such as a SignaLink, another digital-mode interface, VOX, or serial/CAT control depending on the radio and station setup.

    If your transceiver already appears in Windows as a USB audio device, you may not need an additional external sound card. The important part is selecting the correct input and output devices in MMSSTV and keeping your transmit audio clean.

    The easiest way to start: receive first

    Before transmitting anything, spend some time receiving. It lets you learn the program without worrying about PTT, RF output or transmit audio levels.

    1. Install MMSSTV from the official source.
    2. Open the program and select the correct Windows audio input and output devices.
    3. Tune the radio to an SSTV activity frequency.
    4. Turn the radio squelch off so MMSSTV can hear the complete signal.
    5. Open the RX screen and watch for an SSTV transmission.

    When MMSSTV recognizes a supported signal, the picture is built on the screen one line at a time. If the image is badly tilted or slanted, sound-card clock calibration or slant adjustment may be needed.

    Where can you listen?

    ARRL’s current band-plan information lists several common SSTV activity frequencies in the United States, including:

    • 7.171 MHz on 40 meters
    • 14.230 MHz on 20 meters
    • 21.340 MHz on 15 meters
    • 28.680 MHz on 10 meters

    14.230 MHz is probably the best-known HF SSTV meeting point in North America. Remember that band plans are operating guidance rather than a guarantee that a frequency is clear. Listen first, follow your license privileges, and avoid interfering with an ongoing contact.

    Which SSTV mode should a beginner use?

    You will see names such as Martin 1, Scottie 1, Robot 36 and PD120. They are different ways of encoding the image, with tradeoffs in transmission time, resolution and tolerance of poor conditions.

    For ordinary HF experimenting, Martin 1 is a very sensible starting point. One published VHF/FM comparison also found Martin 1 to be a strong general-purpose choice under marginal conditions, while Robot 36 provides a much faster image when signal quality is good.

    PD120 is a higher-resolution mode familiar to many operators from SSTV experiments involving the International Space Station, but you should always follow the mode specified for a particular event rather than assuming every transmission uses the same format.

    Getting ready to transmit

    Once reception is working, move on to transmitting. Load a picture into the TX window and add your callsign so the receiving operator can identify the source. Start with conservative audio levels.

    Do not simply turn the computer volume all the way up. Too much audio can overdrive the transmitter and create a poor SSTV signal. Use the radio’s ALC or transmit-level indications as appropriate for your equipment, and adjust the PC/interface audio for a clean signal.

    A dummy load is an excellent place to test your PTT and audio path before transmitting on the air.

    A simple first-contact routine

    A good first SSTV session can be very simple:

    1. Monitor the SSTV frequency for a while.
    2. Make sure the frequency is not already in use.
    3. Identify by voice if appropriate.
    4. Select the SSTV mode you intend to send.
    5. Transmit a simple image containing your callsign.
    6. Return to receive and see who answers.

    You do not need a complicated graphic. A station photo, antenna photo, QSL-style image, test card or simple callsign graphic is enough.

    Why MMSSTV is still worth trying

    MMSSTV looks old-school because it is old-school. But that is also part of its appeal. It is lightweight, purpose-built, well documented, and teaches the operator what is actually happening between the radio, sound system and SSTV signal.

    For someone already comfortable with FT8, Winlink, DMR or other computer-assisted ham-radio modes, SSTV is a fun change of pace: instead of exchanging a few characters, you are exchanging an actual picture over RF.

    My suggestion: install MMSSTV, start by receiving on 14.230 MHz when 20 meters is open, and get one clean picture on the screen before worrying about transmitting. Once that works, the rest of the setup makes much more sense.

    73 — NJ2RQ