Author Topic: Weather Radios  (Read 1198 times)
Medved
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Re: Weather Radios « Reply #15 on: September 08, 2019, 11:06:19 PM » Author: Medved
I've noticed a lot of the Sangean made radios and alarm clock-radios have RDS, which is not something common on portable radios here in US from what I seen. It looks like a nice radio.

It will be more and more a common place, as the cheapest way to make radio today is to use one of the DSP based receiver chip (it contains the LNA, frequency synthesis for LO, around 225kHz quadrature IF feeding two channel ADC and the rest is in its digital gates (with some even SW), then DAs for audio output, all in one chip. And with that concept it is very simple to integrate extra features like RDS/RBDS, so most chips have that already. It is just the final radio maker decision to not use it (because the simple low power LCD has no way to display it, or it is reserved for just for more "expansive" models, differing only in the piece of code reading out the data from the radio chip.
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GE101R
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Re: Weather Radios « Reply #16 on: September 11, 2019, 07:18:19 AM » Author: GE101R
The problem here is that the signals travel pretty far so if a transmitter signal reaches areas that are not affected and areas that are affected, it's going to send out the same "alert" signal on that frequency assigned to the transmitter.  I So for example, I live in Douglas County, Colorado.  However- there is not a transmitter exclusive to Douglas County.  There is a transmitter in Franktown, which is in Douglas County, but that transmitter also reaches into Arapahoe, Elbert, El Paso, Denver, and parts of Jefferson Counties. So I can monitor that one.. but because that transmitter reaches into those counties, any alert sent out will cause the radios to alarm for whomever is monitoring that frequency.  There is also a transmitter in Denver.  I live about 20 miles south of Denver.  The one in Denver, reaches many communities in a 150+ mile radius.  So people's weather radios in Denver will go off.. and so will others 150 miles away.  It's better than nothing, but annoying as all can be.  Some of you out in the eastern United states have more centralized transmitters, especially those of you in tornado alley. 

https://www.nws.noaa.gov/nwr/coverage/stations.php?State=CO 
Our frequency only covers the four counties surrounding us. Tornado alley.
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Cole D.
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Re: Weather Radios « Reply #17 on: September 13, 2019, 09:14:15 PM » Author: Cole D.
It will be more and more a common place, as the cheapest way to make radio today is to use one of the DSP based receiver chip (it contains the LNA, frequency synthesis for LO, around 225kHz quadrature IF feeding two channel ADC and the rest is in its digital gates (with some even SW), then DAs for audio output, all in one chip. And with that concept it is very simple to integrate extra features like RDS/RBDS, so most chips have that already. It is just the final radio maker decision to not use it (because the simple low power LCD has no way to display it, or it is reserved for just for more "expansive" models, differing only in the piece of code reading out the data from the radio chip.

That makes sense. It seems in Europe and UK RDS is more common and I believe appeared earlier than here, possibly early 1980s. In US I think it first started showing up in early 2000s on car headunits, mostly ones from American automakers. Then Toyota and others got on board, with most recently Honda, Hyundai and Kia. Although it was mostly only offered on upper trim levels with higher spec systems. Most of these, used a green dot matrix display, although it got more common with cars having navigation systems to have color displays. It is becoming more standard in cars, and it's likely because of the federal mandate for backup cameras. In many vehicles the display is integrated to the stereo, so needs a color LCD screen anyway, so little reason not to go ahead and add RDS.

HD radio typically integrates RDS regardless, but I had seen on some Kia systems that it is only given on HD enabled stations, where other regular FM stations only show MHz and no info is displayed. My current car shows it on both and my previous car did for FM (no HD capability on it).

Most RDS capable systems also allow scanning for a specific type (news, rock, pop, religious, R&B, etc) and in some vehicles scan for a station with a traffic report. However, I don't think most people use/used this features, because it involves pushing sequences of buttons.

Not all stations take advantage of all features. The most basic simply display the call letters and give a program type for the stations. Others display full song title/artist name or what talk program is playing currently. Some stations also show websites and phone numbers for commercials played during ad breaks over the RDS.

As far as portable radios, I think some Bose systems have it, but otherwise I don't know of many here other than possibly very high end component systems. Our GE Spacemaker does have it though, but it was only on one or two models of it.
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GE101R
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Re: Weather Radios « Reply #18 on: September 22, 2019, 09:56:18 PM » Author: GE101R
We have the Midland and it work's flawlessly.
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