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 Forum index » DIY Hardware and Software » Developers' Corner
Barely Legal Transmitter (BLT) Ideas
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mosc
Site Admin


Joined: Jan 31, 2003
Posts: 17620
Location: Allentown, PA
Audio files: 125
G2 patch files: 60

PostPosted: Sat May 17, 2008 10:36 am    Post subject: Reply with quote  Mark this post and the followings unread

Inventor wrote:
... they treated me rudely and with disdain.


Woah, that's a very unusual report about hams. I'm very surprised. Shocked

If the local hams are like that, then maybe you should not waste time with them.

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my music and other stuff
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Inventor
Stream Operator


Joined: Oct 13, 2007
Posts: 5978
Location: San Antonio, Tx, USA
Audio files: 258

PostPosted: Sat May 17, 2008 11:40 am    Post subject: Reply with quote  Mark this post and the followings unread

mosc wrote:
Inventor wrote:
... they treated me rudely and with disdain.


Woah, that's a very unusual report about hams. I'm very surprised. Shocked

If the local hams are like that, then maybe you should not waste time with them.


It was Raleigh, North Carolina USA Hams. I'm just north of Miami Florida USA now so I bet if I tried again it would be great. I don't have to tell you how awesome Hams are, doing emergency services for the community and helping each other and all that jazz. But yeah, no matter how good a group of people is, there are always a few who have a little growing up to do!

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TheShaggyDA



Joined: May 17, 2008
Posts: 9
Location: UK

PostPosted: Sun May 18, 2008 12:25 pm    Post subject: Reply with quote  Mark this post and the followings unread

One problem I can foresee is that of others swamping the signal - if each unit is also a transmitter, what's stopping someone from abandoning the incoming signal, and transmitting their own? It's been a few years since I dabbled, but I gave up on CB radio because of the kids just leaving the mic keyed, "bangin' out their choonz" Sad
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Inventor
Stream Operator


Joined: Oct 13, 2007
Posts: 5978
Location: San Antonio, Tx, USA
Audio files: 258

PostPosted: Mon May 19, 2008 8:40 am    Post subject: Reply with quote  Mark this post and the followings unread

This is another silly idea but I'll toss it into the mix and see if it gets shot down easily. I wonder if, rather than use two frequencies, it would be possible to create a circuit that works with just one. I'm thinking of a negative impedance circuit combined with automatic gain control in such a way that the weak input signal gets amplified back to its own antenna.

I know, sounds crazy and probably is. But while working with the circuit described in the following electro-music.com thread:

http://electro-music.com/forum/topic-23234.html

I noticed something interesting. I had set up the oscillator just outside of the oscillation region and tuned in the neighborhood of 60 Hz. Then when I touched the nodes of the oscillator it started oscillating at 60 Hz with a nice clean sinusoid. When I removed my finger the oscillation stopped. I deduced that my body was an antenna picking up the 60 Hz magnetic field of my apartment's wiring and that weak signal was enough to make the oscillation occur. The circuit's Q could be detuned to accommodate music bandwidth, and the output fed to the antenna.

Somthing that simple might not work, but with additional creative ideas perhaps it could be made to work. I don't know, just thinking out loud about a silly idea but I thought I'd share it and see if it sparks your creativity somehow. What do you think?

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RF



Joined: Mar 23, 2007
Posts: 1493
Location: Northern Minnesota, USA
Audio files: 28

PostPosted: Tue May 20, 2008 5:11 am    Post subject: Reply with quote  Mark this post and the followings unread

Inventor -
Here's an approach for you to think on Smile

bruce


A_New_Approach_to_Synchronous_FM_BCEWHP.pdf
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Inventor
Stream Operator


Joined: Oct 13, 2007
Posts: 5978
Location: San Antonio, Tx, USA
Audio files: 258

PostPosted: Tue May 20, 2008 7:09 am    Post subject: Reply with quote  Mark this post and the followings unread

Thanks Bruce, that was an interesting read, though most of the figures were missing. Another point of reference to consider here.
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shebb



Joined: May 07, 2008
Posts: 12
Location: usa

PostPosted: Wed May 21, 2008 1:21 am    Post subject:
Subject description: modding cheap transmitter
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I have thought alot about this stuf in the past, and always wondered if it woud just be as easy as using something like the ramsey fm25b, and somehow patching the gain of a higher powered radio amp into the guts of the ramsey.

seems like another, maybe unrealistic, but possibly cheap method.
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