How-To: Operating/Adjusting the Transmitter.

1. Frequency display

2. On/Off switch

3. Frequency selector switch
For ships, the MW ship frequencies can be set here.
For coastal radio stations, the working frequencies are already set at startup and cannot be changed during operation. However, if a coastal radio station was started with 500 kHz, you can choose between 500 and 512 kHz here.

4. Operating mode switch
Chat – Operation via text input in chat mode (direct or buffered)
Key – Operation via connected Morse key (connection to sound card).

5. Microphone input control
The microphone input signal can be adjusted here (monitoring via the oscilloscope).

6. Power control
– Not functional –

Frequency setting for coastal radio stations


For coastal radio stations, the frequency is already selected when accessing the radio station and cannot be changed anymore (exception: selecting 512 kHz instead of 500 kHz to allow QRT for emergency operations on 500 kHz).

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How-To: Operating Receiver R#2 (Emergency Receiver)

Receiver R#2 (Emergency Receiver)

When the emergency receiver is turned on, transmissions on the 500 kHz frequency can be observed, even if the main receiver is currently being used on a working frequency.
The 500 kHz traffic is recorded in the reception display for RX2 in the background when the display is currently set to RX1 and can be shown by clicking on the RX2 button (see also The HOERWACHE radio station, point 15).

1. Power switch and volume control
With a click on the power switch, the emergency receiver is turned on. The volume of the receiver can also be adjusted using this switch.

2. Frequency display
The emergency receiver RX2 only has the emergency and calling frequency of 500 kHz. The received characters are recorded in the text box for the reception display RX2 (see also The HOERWACHE radio station, point 15).

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The HOERWACHE Radiostation (Overview)

The HOERWACHE Radio Station

1. The radio room clock with red and green sectors for displaying the distress pause.

2. Band selector switch for selecting maritime radio bands in the range of 400 kHz to 30 MHz.

3. Status display for the server connection (Server connected) and the database (Ready).

4. Emergency receiver with on/off switch and volume control.

5. Activity indicator with frequency bar for displaying activity and frequency tuning.

6. Station display showing the active station on the set frequency.

7. Transmitter power indicator: Only during transmission with a Morse key. Moves in rhythm with the Morse code.

8. Operating mode switch.

9. Oscilloscope: Switch and threshold adjustment.

10. Display for ship position, course, and speed. For ship stations, there are also input fields for shifting to a new position.

11. Compass: With ship stations, this can be used to steer the ship (mouse wheel).

12. Output bar for received Morse code (Not for fixed, regular transmissions from coastal radio stations).

13. …

14. Input field for sending characters in Morse chat in direct or indirect mode. In direct mode, the characters are sent immediately, in indirect mode, only after entering the characters and clicking the GO button.

15. Reception textbox for incoming characters for receiver 1 and 2. The display can be switched using the RX1 and RX2 switches. For example, the auxiliary receiver RX2 can write in the background at 500 kHz while the foreground RX1 (main receiver) writes at a working frequency.

16. Main receiver with on/off switch and adjustment options for frequency and volume. Button for 500 kHz and 7 programmable station buttons.

17. Main transmitter with on/off switch and selector switches for the usual ship maritime radio frequencies. Coastal radio stations can only select 500 and 512 kHz here (The working frequency is already selected when calling the station).

18. Station display: Displaying station name and callsign, R/O, course, and speed. A switch allows setting the readiness to listen. This indicates to other stations whether one is ready to listen or busy (QRL).

How-To: Using the main receiver

The main receiver RX1

has a power switch, eight buttons for programmable fixed frequencies, one of which is fixed at a frequency of 500 kHz, a digital frequency display with adjustment capability using the mouse wheel, a large tuning knob (Tune), as well as controls for RF gain and volume.

1. Power on the device
You can determine whether the device is on or off by checking if the green light on the button is on or off.

Immediately after turning on the device, you will hear static noise from the speaker, and the selected frequency will appear on the digital frequency display. If the set frequency corresponds to one of the programmable memory slots or the 500 kHz frequency, the corresponding switch will light up.

2. Frequency display (and adjustment)
Frequencies from 400 kHz to 30 MHz are displayed here and can be adjusted using the mouse wheel.

To adjust with the mouse wheel, place the mouse pointer on the desired digit and roll the mouse wheel forward or backward. Each digit must be set individually; there is no carryover.

3. 500 kHz quick button
This button allows you to quickly select the emergency and calling frequency of 500 kHz at any time. The button lights up when 500 kHz is active.

4. Programmable memory slots
Previously selected frequencies can be stored in memory slots 1 to 7. These settings remain even after exiting the program. However, the memory slots are not cross-browser compatible and only apply to the same computer.
That means if you access the radio station with Firefox, for example, and save frequencies in it, they will not be available if you subsequently open the program with a different web browser. However, they will be available every time you access the Firefox web browser, as long as the memory slots are not overwritten or deleted.

To save a frequency, follow these steps: First, tune the receiver to a frequency, and then press Ctrl+<memory slot> to save that frequency. For example, to save on memory slot 1, you would click on memory slot 1 while holding down the Ctrl key. To recall the saved frequency, simply click on the corresponding memory button (without the Ctrl key).

5. RF Gain
– Not functional –

6. Volume
This control adjusts the volume. The maximum setting depends on the system’s settings (Windows, etc.).

There is also distance-dependent volume control, which means that the volume at which a station can be heard diminishes with distance until the station is no longer audible. The user cannot adjust the distance-dependent volume control.

7. Tune
Along with the band selection switches (located to the right of the radio room clock in the control panel), this control allows for tuning all frequencies from 400 kHz to 30 MHz.

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