If you have followed the previous steps, connection of power supply, antenna and a loudspeaker or some headphones, at least a hiss should be audible from the set.

After tuning to 6 1 5 5 kHz resp. 6.155 MHz, the „Österreichischer Rundfunk“ should be audible (at least in the morning hours, the terrestrial broadcasting service of the Austrian national radio is still active for some hours in the day…

The desired frequency can be set with the rotary tuning knob; with many semi-professional receivers, the tuning speed is increased when the tuning knob is turned quickly (so called electronic flywheel) or the tuning speed can be adjusted. With the NRD-535, the UP / DOWN keys let you select the next 1 MHz range, other receivers have a rotary switch for the 1 MHz ranges.

Some receivers allow jumping to the next amateur or broadcast band using a MB (meter band) pushbutton.

JRC NRD-535: Display

5: The signal strength meter displays the radio signal strength and thus helps to tune exactly to a station on a known frequency. High quality signal strength meters display in S-steps from 1 - 9 and for stronger signal in dB over S9, for example S9+20, S9+40, S9+60 dB. The instruments or digital indicators on cheaper receivers only have rudimentary 1-5 or 1-10 scales. But even an S-meter with perfect graduation can show too much or too little signal intensity, depending on the setting of the signal meter amplifier - so the meter should be calibrated. The minimum variant for travel portables is a red LED that lights up when a the radio is tuned to a signal.

6: The frequency display can be designed as an analogue dial with a dial pointer and marks or - a „must“ with modern receivers - with a digital display, it's resolution is usually between 1 kHz and 10 Hz.

7: The tone control, sometimes even designed as separate treble and bass controls, can optimise the audio response to improve the signal, so you get most intelligable audio out of the loudspeaker. With communication receivers, an external loudspeaker or high-quality headphones are indispensable for optimal intelligibility. Some units have a small built-in monitor speaker so you can test the basic functioning even without an external speaker.

Now, „Östereichischer Rundfunk“ should be audible from the loudspeaker.

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en/kurzwellenempfang_2.txt · Zuletzt geändert: 2021/04/15 14:54 von mb