Grundig Model 5017 U Stero

[Jeffhs]

Originally posted by Telecolor 3007
But what for where used "Socket for channel". I saw that my radio haves input/output for record-player and tape-recorder.
And what ment "channel" on FM? My radio got FM 88-108 Mc
and Channel 200-300.

I don't know about the "socket for channel" (unless, I am guessing, this is an input for a stereo FM multiplex adapter), but I can tell you what the Channel 200-300 scale on your radio is for. First of all, as has been mentioned by others here, your unit was an export model, since it has 88-108 MHz FM (in most of Europe, the FM band goes only to 100 MHz or so).

As to the channel 200-300 scale: The FM broadcast band is divided into 100 channels, each 200 kHz or 0.2 MHz wide, from 88.1 to 107.9 MHz. The FCC (the United States Federal Communications Commission, which regulates all broadcasting and telecommunications here) refers to FM frequencies by the channel numbers, rather than the actual frequencies; for example, here near Cleveland, Ohio, where I live, we have an FM radio station on 105.7 MHz, which would be Channel 289. Another station near Cleveland is on 92.3 MHz, FM channel 222. A station near here is on 107.9 MHz, FM channel 300.

Note that the FM channels begin with channel 201, 88.1 MHz--not channel 200 as one might expect.

Some of the first U. S. FM radios made in the late '40s-early '50s, after the 88-108 MHz FM band was commissioned for broadcast use here, had channel scales similar to the one on your receiver; this was, I think anyhow, an attempt by the FCC to get Americans accustomed to the idea of referring to FM radio stations by channel numbers, the same as we refer to TV stations today. The idea didn't go over very well, so by about 1951 or thereabouts the 200-300 channel dial disappeared from the dial glass on the fronts of these sets. Today, with most AM/FM radios and stereo systems now having digital tuning which shows the actual frequency in bright numbers right on the dial (no guessing), there is, of course, no need for analog dial scales or channel charts. These radios often allow for split-channel tuning, i. e. tuning between channels of the standard North American FM band. In the U. S. we have FM stations spaced at 0.2MHz (200 KHz) intervals; the number after the decimal point in the frequency is always odd (.1, .3, .5, etc.). However, in Europe, the FM stations' frequencies come in between our 200-KHz channels, so a station, say, in Germany might be on 88.6 MHz. Today's digital FM tuners are designed to take this spilt-channel spacing into account; the digital AM/FM tuner in my Aiwa NSX-A888 bookshelf system does, for example, since these units are also very popular in Japan, where FM stations are assigned frequencies between U. S. channels. The tuners are made to accomodate both standards so they can be used either here in the U. S. or in Europe without modifications. All that is usually necessary to change the channel spacing is a simple front-panel keystroke sequence which resets the system's internal microprocessor (at least that is how one resets the tuning interval on my stereo's tuner); this sequence is ordinarily explained in the instruction manual.

Hope this information helps.

Kind regards,