en:kurzwellenempfang
Unterschiede
Hier werden die Unterschiede zwischen zwei Versionen angezeigt.
Nächste Überarbeitung | Vorhergehende Überarbeitung | ||
en:kurzwellenempfang [2021/04/13 19:51] – angelegt mb | en:kurzwellenempfang [2021/04/18 11:35] (aktuell) – mb | ||
---|---|---|---|
Zeile 1: | Zeile 1: | ||
+ | ===== Shortwave Reception ===== | ||
From the example of the shortwave receiver [[NRD-535]], | From the example of the shortwave receiver [[NRD-535]], | ||
+ | |||
+ | There have been some guidebooks usually given away with the purchase of a "world receiver", | ||
+ | * {{ : | ||
Note that not all receivers are equipped with all features mentioned, the simpler receivers with fewer options and knobs are easier to operate. | Note that not all receivers are equipped with all features mentioned, the simpler receivers with fewer options and knobs are easier to operate. | ||
Zeile 7: | Zeile 11: | ||
With some receivers, you only have to pull out the telescopic antenna; professional receivers usually require an outdoor aerial. For the first attempts, some meters of insulated wire connected to the terminal "long wire antenna" | With some receivers, you only have to pull out the telescopic antenna; professional receivers usually require an outdoor aerial. For the first attempts, some meters of insulated wire connected to the terminal "long wire antenna" | ||
- | {{: | + | {{: |
- | **1**: The power switch or mains switch is used to switch on the receiver, a third position activates the timer mode. | + | <fs xx-large> |
- | **2**: On semi-professional and professional receivers, the volume control is often labelled AF-Gain (**A**udio **f**requency). | + | <fs xx-large> |
- | **2a**: The volume control marked [[RF-Gain]] (**R**adio **f**requency) is used to adjust the high-frequency amplification. Especially when long-wire antennas are used, that supply high signal voltages, overloading of the receiver' | + | <fs xx-large> |
In this case, and in the case of "ghost stations" | In this case, and in the case of "ghost stations" | ||
- | **Caution: in normal operation, the RF gain must always be be turned to the maximum setting; if it is turned down inadvertently, | + | **Caution**: in normal operation, the RF gain must always be be turned to the maximum setting; if it is turned down inadvertently, |
- | **Caution: with some receivers, the automatic RF gain control (AGC) is switched off when the RF gain control is activated. In manual mode you have to control the RF amplification carefully by hand to avoid distortions caused by strong signals. | + | **Caution**: with some receivers, the automatic RF gain control (AGC) is switched off when the RF gain control is activated. In manual mode you have to control the RF amplification carefully by hand to avoid distortions caused by strong signals. |
- | **3**: The frequency can be selected with the **main tuning knob**, with many receivers the tuning step width and thus the tuning speed can be switched. The maximal still acceptable tuning step for AM reception is 1 kHz, better would be 0.1 kHz. For SSB reception steps should be no more then 40 - 50 Hz to avoid heterodyne tones, some station receivers already have 1 Hz tuning steps. | + | <fs xx-large> |
The rotary tuning knob should have a certain weight for flywheel effect, run smoothly and tuning should react without mechanical backlash. | The rotary tuning knob should have a certain weight for flywheel effect, run smoothly and tuning should react without mechanical backlash. | ||
Zeile 27: | Zeile 31: | ||
Few commercial receivers only provide up/down tuning buttons, some rare models use decadic switches to set the reception frequency. | Few commercial receivers only provide up/down tuning buttons, some rare models use decadic switches to set the reception frequency. | ||
- | **4**: With the **decimal key pad** a desired reception frequency can be entered directly, pushing the " | + | <fs xx-large> |
At least a hiss should now be audible from the speaker. | At least a hiss should now be audible from the speaker. | ||
[[kurzwellenempfang 2|>> next <<< | [[kurzwellenempfang 2|>> next <<< |
en/kurzwellenempfang.1618336274.txt.gz · Zuletzt geändert: 2021/04/13 19:51 von mb