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/diy/ - Do It Yourself

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60992 No.60992 [Reply] [Original]

How do you turn a normal AM/FM radio into a shortwave radio?

I saw a tutorial for it on Instructables, but in order to view the whole tutorial, I have to pay for it. and thats bullshit, so I'm asking you /diy/k heads to help me. I need a decent tutorial on how to Modify a regular analog AM/FM radio into a Shortwave radio.

>> No.61003

Pretty pointless to do that when everything is switching over to digital in a few years

>> No.61008

>>61003
That is not the case. Digital does NOT work efficiently over long distances due to atmospheric interference. You are limited to about 300 baud or less to ensure error correction.

>>60992
Why don't you just buy a shortwave receiver? They're about $50.

>> No.61011

>>61008
After the switchover the digital frequencies will occupy the same bandwidth as the old AM/FM/SW bands. Using them will most likely be illegal, as it'll interfere with the digital broadcasts.

>> No.61023
File: 2.02 MB, 686x3735, Listen to Shortwave Broadcasts on an AM Radio.jpg [View same] [iqdb] [saucenao] [google]
61023

>>60992

>> No.61025

>>61011
You are unbelievably wrong.

You cannot regulate 100 khz through 30 mhz. It is physically impossible.

>> No.61026

>>61011

>digital
>shortwave

wat

>> No.61030

>>61026
My thoughts exactly.

Maybe VHF/UHF...

But even then, Airband will be exempted.

>> No.61031

>>61025
>>61026
You can send digital information over ANY medium. You could send it over tin-cans.

>> No.61035

>>61031
Not as efficiently as analog.

Digital voice, with any interference, makes you sound like a modem.

>> No.61046

http://www.mediafire.com/?dsr4bkuc6hg35

Made a radio folder. Will include things like "ham radio for dummies", "Practical radio frequency handbook" "Arrl handbook for radio communications".

>> No.61052

>>61035
Radiofag, I'd like your help. To graduate from highschool in my state, we have to do a project consisting of a research part and a product part. After sitting in on some of your threads, I'd like to do mine on amateur radio operation, however I'd like help getting started. The research part will be easy enough, it is simply writing a paper on a specific topic about radios. The actual product, however, I would like some assistance on. I need some ideas for DIY projects I can do (hour requirement for different things are generally >20 hours), along with materials/extra components I would need, and other things that would be helpful in my project. Thank you for any help you can provide me

>> No.61200
File: 296 KB, 1024x984, qrp radio.jpg [View same] [iqdb] [saucenao] [google]
61200

>>61046
Nice!

>>61052
Here's a CW transmitter made from the components in the base of a florescent light bulb.
>http://www.aa1tj.com/dasderelicht.html

You'll need a receiver that can tune to 3.5 - 3.8 mhz to show that it works.

>> No.61217

>>61025
Correct!

>>61026
Well there is DRM

>> No.61218

>>61217
The only digital modes I can really think of are ones like PSK31, RTTY, SSTV, and packet.

PSK31 sucks if there is interference. RTTY is okay, but it slow as hell.

SSTV turns images into snow. True story.

Packet is incredibly slow.

>> No.61221

i have a unique idea

has anyone ever anti-heterodyned incoming frequencies?

i.e. mix shortwave frequencies up to the GHz levels and then do gain?

>> No.61229

>>61218
You've never heard of DRM?

http://www.drm.org/

>> No.61230
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61230

>> No.61232

>>61229
I love how both of their sample stations are short range.

Long range is where analog shines.

>>61221
Sounds expensive and inefficient. Probably a beast to demodulate as well.

>> No.61233
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61233

>> No.61236

I got a 15$ shortwave radio off ebay, not really accurate but still fun to use. Half of the channel are Jesus channels tough.

>> No.61238

>>digital radio
sound glitches, please god no.
it's way more annoying than background noise imo. I can't stand watching digital ota tv because of all the glitches. I miss snow, really.

>> No.61239

>>61232
I tend to think the voice quality suffered in their sample too but that could be the sound files.

Yep I'd like to hear how it drops out too.

You can build a device to decode it with your sound card. Have never done it but perhaps something to play with there. I know it is used by some amateurs.

>> No.61241

>>61236
About $50 is where the good ones start to show up.

The Degen DE1103 is a good choice.

Bottom line, you want something that can do SSB as well...the majority of communications is transmitted using SSB-mode.

>> No.61242

>>60992
link to instructables? as far as i know instructables is free, you can register for free