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I'm considering purchasing a late 80's vintage digital tuner made for the European market for use in the US. Before I do that, I'd like to make sure that it will actually work here, or if there are differences in radio broadcasts between the two continents that will render it fairly useless.
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If I remember correctly, the tuning steps are different from U.S., with the decimals being even . 90.2, 97.4, etc.
Hi, sibellc:Make certain that this tuner came with a universal voltage selector.
I believe that the time constants were also different. The spectrum should be about the same, methinks.
I know that, in Japan, the FM frequency spectrum differs.
is different on FM broadcasts in Europe vs US. The US system used a 75 micro-second - what you mentioned as time constant - de-emphasis network where Europe used a 25 micro-second time constant.This de-emphasis arrangement is *roughly* equivelant to the RIAA curves found on LPs. That is, the highs are boosted at broadcast time at the FM station and the low frequencies are reduced. Then the FM tuner reverses the arrangement - de-emphasis! - which then reduces hiss and noise picked up in the reception.
Some older tuners had a switch on the back to change this out - or sometimes found inside. By the 80s, though, these had disappeared due to parts count reductions.
BTW, Dolby tried to get into the FM broadcast noise reduction business and you'll find a number of 70s vintage tuners with the de-emphasis switch on them labeled Dolby something-or-other as a result.
I doubt that you'll hear much difference in today's FM broadcasts with a tuner in either position.
Hope that helps.
Cheers,
Hello David ,
in Europe the time - constant for the deemphasis network is 50µs as you can see here on a professional R + S decoder , which is also switchable to the US standard .
Regards , Alexander .
Yep as above.Europe 50usec, US 75usec.
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