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How to design a traditional radio

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sharps_eng
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re: How to design a traditional radio
sharps_eng   1/13/2012 9:35:44 PM
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I never got into amateur radio, it was radio control that interested me initially, then electronic music, then pro audio, then microprocessors. Kids today might be interested in making remote-controlled gadgets, especially if they can connect to their phone or PC, and control from that wirelessly. Everyone has wireless data with phones and wifi networks and wii, but local small-scale control of toys is pretty thrilling stuff when you have built it yourself! As we all know, with a proper hobby, it is the journey as much as the arrival!

WKetel
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re: How to design a traditional radio
WKetel   10/5/2011 12:50:17 PM
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The radio described here is still a digitally tuned radio, except that an encoder input is used instead of up and down buttons. It still tunes in steps instead of continuous tuning, which renders it unsuitable for other than broadcast channel listening. The comparisons to prior full analog radios are way off in the negative remarks, except they would apply to the minimum cost, bottom level radios. Many of the earlier generation linear circuit receivers delivered performance far exceeding anything that this IC could ever even possibly provide, all without a single digital component. From the description given, the primary benefit of using this particular device is that it is much cheaper than any other way of making a radio. An article describing the benefits and capabilities of a device could be interesting and worthwhile, but disparaging previous technology, and comparing it's performance to cheap junk does not add to the value of this article at all.

boob
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re: How to design a traditional radio
boob   10/5/2011 8:20:45 AM
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how do design a simple radio? This is just another article pushing a chip of course with no useful design content. Why not just title it with si-labs and say you can make a simple to design radio with the chip? The problem with all these silicon radio chips is that the support is rubbish/zero if you are less than 500k units pa. So if you are not designing a mass market product you have little differentiation...everyone is the same. And you can't do anything that is not obvious in the datasheet. If you run into a problem (say sensitivity due to an interaction with your input circuit) you often have no clue what is in the chip and nobody will take the time to talk to you for your small 50k business. So designing with discrete parts and multiple ICs will always be required for products that are not mass market and want to differentiate. And what happens when you want to get hold of signal to do something other than AM in the MW band, or FM in the VHF band.....its all locked inside.

Jean-Luc.Suchail
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re: How to design a traditional radio
Jean-Luc.Suchail   10/5/2011 7:43:08 AM
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My first radio, 40 years ago (I was 10) was a Reflex type 3 transistors. But the selectivity was very bad. So I made a superheterodyne a few months later with 4 transistors (2xBF194 + 2xBC148). Nothing fancy but very good working for MW and LW. The only trick was to adjust properly the padding and trimmers of the double variable varable capacitor. These were good times when I became Ham Radio. I am still, having fun with high power tubes, but young guys do not even know what a tetrode is....

Bill_Higdon
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re: How to design a traditional radio
Bill_Higdon   10/5/2011 12:39:29 AM
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From what I've seen one problem with all of the "new" radio chips is they can't handle CW

old account Frank Eory
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re: How to design a traditional radio
old account Frank Eory   10/3/2011 6:52:27 PM
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Agreed. Not much real design info here.

Bert22306
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re: How to design a traditional radio
Bert22306   9/30/2011 10:56:18 PM
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Or, you can try something like the Logitech Squeezebox Radio.

Bert22306
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re: How to design a traditional radio
Bert22306   9/30/2011 10:40:37 PM
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My "simple design" for an Internet radio was to dedicate a PC to my audio/TV system. I got a slim design, designed to be mounted vertically or horizontally, and it looks just like any other stereo system component when mounted horizontally. Its monitor is the HDTV set (which has an RGB input, as well as HDMI, and I use RGB). PC audio, via mini-phone plug, goes to the stereo preamp, amp, speakers. Keyboard and mouse are wireless. Broadband Internet connection is 802.11n (wireless). There you go. You can listen to any streaming radio or watch any streaming TV, sound is great, image is great, and you have complete flexibility. Once you've set up your favorites, with the wireless keyboard, all the radio or TV "tuning" can be done with the mouse only. No more difficult than using a typical TV remote. Drag it on the couch next to you. Piece of cake.

DrFPGA
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re: How to design a traditional radio
DrFPGA   9/30/2011 10:18:07 PM
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What I want is a simple internet radio to get streaming stations. Anyone have a simple design?

Bert22306
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re: How to design a traditional radio
Bert22306   9/30/2011 7:59:30 PM
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I've pretty much stopped using SW, ever since important broadcasters like the BBC have dropped off the air(except in transmissions to Africa), preferring to stream over the Internet instead. However, even SW could experience a decent revival, if it would start using something like DRM (digital radio mondiale) to improve its quality. DRM is already set up to operate over the SW band. HD Radio could easily be upgraded to do the same thing. You would be astonished at the audio quality difference between analog AM and HD Radio transnmitted over the AM band. Even for voice programs. Like night and day. I can no longer get interested in any radio that doesn't include digital reception. In fact, I can't figure out what's keeping analog-only radios on the market. Almost makes me think that the vendors are in bed with satellite radio providers, trying to get people hooked on yet another monthly fee, instead of introducing people to digital terrestrial radio the easy way. With the US system, which operates over the existing AM and FM bands, it's a complete no-brainer.

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