en:rf-b45
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— | en:rf-b45 [2021/04/18 16:10] (aktuell) – angelegt mb | ||
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+ | ====== Panasonic RF-B45 ====== | ||
+ | Manufactured by [[National Panasonic]]. | ||
+ | In 1991, [[Panasonic]] presented the RF-B45, a travel portable capable of demodulating single sideband signals. The " | ||
+ | |||
+ | {{: | ||
+ | ===== Technical data ===== | ||
+ | * [[Principle]]: | ||
+ | * [[Operating modes]]: [[A1]] with BFO, [[A3|AM (A3)]], [[F3|FM (F3)]] | ||
+ | * [[Frequency range]]: FM, LW, MW, 6 x SW (1.6 - 30 MHz) | ||
+ | * [[Frequency dial]]: [[Digital display]] 5 kHz and analogue fine tuning | ||
+ | * [[Frequency memories]]: 18 memories (9 FM, 9 AM) | ||
+ | * [[Signal strength indicator]]: | ||
+ | * [[Signal processing]]: | ||
+ | * [[Features]]: | ||
+ | * [[Sensitivity]]: | ||
+ | |||
+ | ==== Power supply ==== | ||
+ | * [[Batteries]]: | ||
+ | |||
+ | ==== Dimensions ==== | ||
+ | * 204 x 119 x 37 mm, weight 0.62 kg | ||
+ | |||
+ | ==== Accessories ==== | ||
+ | |||
+ | {{: | ||
+ | ===== Operation ===== | ||
+ | Nearly in the same year, when Sony presented the [[ICF-SW7600]], | ||
+ | |||
+ | With a size of 204 x 119 x 37 mm and it's weight of 620 g, the small travel radio has the dimensions of an average pocket book. Is has a fold out stand and the back like the similarly sized Sony sets. The telescopic antenna has a flexible joint and can be moved in vertical position. | ||
+ | |||
+ | The left part of the **front panel** is taken by the speaker with a diameter of 7 cm. | ||
+ | |||
+ | At the right part, you find the liquid crystal display, ten numbered keys for direct frequency entry, and at the right the UP / DOWN pushbuttons for tuning and the main switch. | ||
+ | The LCD panel will display the frequency, in the long- and mediumwave ranges with 9 kHz channel spacing as commonly used in Europe, in the shortwave range in 5 kHz steps; also the memory channel number and a three step signal strength indicator is displayed. The time is displayed, when the receiver is switched off. Small pushbuttons next to the frequency display will activate the time setting (MEMORY/ | ||
+ | By pressing ENTER/METER and one of the numberes keys, the receiver will jump to the lower edge of one of the common shortwave broadcast bands. | ||
+ | |||
+ | If the receiver is tuned to a certain frequency, this can be stored in one of the nine memory channels by pressing the button MEMORY/TIME SET followed by a number key. Press the same number key later again to recall the station from memory. | ||
+ | By pressing the bigger buttons TUNING + or -, you can tune up or down from he active frequency in the shortwave band. The tuning speed increases, when you press the button for a longer time. The button AUTO TUNING activates a scanning mode stopping at the next active active channel with a carrier above a certain treshold. | ||
+ | The pushbutton OPERATION with a green backlit LED will switch the radio on or off, use the key SLEEP to let the set play for another 90 - 60 - 30 minutes until automated shut off. | ||
+ | |||
+ | Similarly as found in the [[ICF-7600D]], | ||
+ | |||
+ | At the left small face of the cabinet, you find the jacks for a center - negative external 6 V DC power supply, earphones, a tiny attenuator switch DX/LOCAL and an antenna socket (not for sets sold in Germany), a simple random wire antenna comes with the RF-B45. | ||
+ | |||
+ | As most of the buttons are self explanatory, | ||
+ | |||
+ | {{ : | ||
+ | |||
+ | Of course, the performance of a used Panasonic RF-B45 is miles ahead of anything you hear from a cheap discount store portable from a Chinese manufacturer. In contrast to the older analog radios with only analog bandspread dials, you can tune into a known frequency with perfect accuracy and you are absolutely sure whether there is a signal and reception conditions are well or there is nothing, you are trying at the wrong time or poor conditions are the reason, you don't have to think whether you might have tuned a few kHz to high or to low. | ||
+ | |||
+ | The set performs much better then even the cheaper Chinese digital radios which usually come without a BFO for SSB reception and without a fine tuning arrangement to tune in to frequencies between the 5 kHz channel spacing - the RF-B45 is a real small "World band receiver" | ||
+ | |||
+ | |||
+ | ===== Technical principle ===== | ||
+ | [[Double conversion superhet]], digital PLL synthesis circuit. | ||
+ | |||
+ | ==== Components ==== | ||
+ | The set is equipped with semiconductors. | ||
+ | |||
+ | ===== Technical documentation ===== | ||
+ | * {{ : | ||
+ | |||
+ | ==== Development ==== | ||
+ | {{gallery>: | ||
+ | |||
+ | ==== Further information ==== | ||
+ | * [[https:// |
en/rf-b45.txt · Zuletzt geändert: 2021/04/18 16:10 von mb