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Ontario Technoblog

Ontario Emperor technology blog.

This blog has been superseded by the mrontemp blog
Location: Ontario, California, United States

Sometime audio artist. Email comments on this blog to the gmail account mrontemp.

Tuesday, September 06, 2005

Don't Be So US-centric - Japanese FM Radio

Some time ago I published a press release with the following business address:

KOER Synthetica Radio 87.1 MHz
1 Empire Way Suite 2525
Guasti, CA 91743

The joke, of course, is that there isn't a radio station broadcasting at 87.1 megahertz.

Well, maybe not in the US, but elsewhere.

In most of the world, the FM broadcast band, used for broadcasting FM radio stations, goes from 87.5 to 108.0 MHz. In the Americas (ITU region 2) it starts at 87.8, at the top end of TV channel 6. In Japan the FM broadcast band is 76–90 MHz, unlike any other country in the world. The old OIRT band in Eastern Europe was 66–74MHz.

The name "FM band" is misleading, since one can transmit FM on any frequency. All of these bands mentioned are in the VHF band.

Here's a stupid military trick that I found:

The military is permitted to use freq hop in the U.S. because our FM radio stations only transmit above 87.9 MHz, but in Japan and other foreign countries the FM radio broadcasts are below 87.9, restricting the military to un-encrypted plain text transmissions to avoid tromping on civilian radio stations. (Grunt trick: if you're bored in the field overseas, start manually inputting freqs into your SINCGARS from 87.1 MHz and below, with the squelch turned off, to pick up local radio stations. The speaker on the handset sucks, but you can still pick up some music stations to pass the time. Just don't let your platoon commander find out. Also, don't key the handset, or your transmission will go out over every civilian national's stereo and piss off the local government. This has a tendency to mess up the Status of Forces Agreement and might even get your liberty restricted.)

Philips has thought about this issue when designing FM radio add-ons for PDAs:

Philips radio IC solutions make it easy to add FM radio functionality to a PDA or other handheld devices. High integration reduces chip and component counts, while low-power operation extends battery life. Our radio ICs use a unique tuning algorithm for improved performance, and are ready for use in European, US, and Japanese FM bands.

TEA5880 Digitally tuned, low-power FM stereo radio

The TEA5880 is a single-chip, fully integrated stereo radio for low-voltage and low-power applications. The radio is completely adjustment free, and requires absolutely no external components. That means lower overall cost, and reduced board space. An innovative tuning algorithm makes tuning independent of the channel spacing. Low power consumption along with a standby mode for power-down, will extend battery life in handheld applications. The radio can be tuned to the European, US, and Japanese FM bands.

TEA5767/68 single-chip FM stereo radio IC

The TEA5767/68 is a single-chip, digitally tuned FM stereo radio IC for low-voltage applications. It employs an innovative radio architecture concept that replaces external passive components and complex circuitry, and it requires zero external alignment. This radio IC offers easy software implementation, and its small package size makes it ideal for designs where board space is limited.

TEA5757/59H AM/FM Self-Tuned Radio (STR)

The TEA5757/59H is a highly integrated, single-chip AM/FM stereo radio IC designed for a broad range of portable devices. It contains all the blocks required to build a complete digitally tuned radio function, and features the new electronic tuning system, called Self Tuned Receiver (STR). Low power consumption and wide operating voltage make it an ideal radio IC for portables, as well as home systems and multimedia systems.


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