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    Kirt Blattenberger,


RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The World Wide Web (Internet) was largely an unknown entity at the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps while tying up your telephone line, and a nice lady's voice announced "You've Got Mail" when a new message arrived...

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Modifying A Baby Monitor - More Wattage - RF Cafe Forums

RF Cafe Forums closed its virtual doors in 2012 mainly due to other social media platforms dominating public commenting venues. RF Cafe Forums began sometime around August of 2003 and was quite well-attended for many years. By 2010, Facebook and Twitter were overwhelmingly dominating online personal interaction, and RF Cafe Forums activity dropped off precipitously. If the folks at phpBB would release a version with integrated sign-in from the major social media platforms, I would resurrect the RF Cafe Forums, but until then it is probably not worth the effort. Regardless, there are still lots of great posts in the archive that ware worth looking at.

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Post subject: Modifying A Baby Monitor - More Wattage Posted: Fri Jun 10, 2005 9:21 pm
I'm a licensed ham and I need some diagrams or instructions on how to mod a 49 MHz baby monitor to put out more power. It's currently at 100 mW. I'm looking to boost that up to at least 500 mW.


Post subject: Posted: Fri Jun 10, 2005 9:25 pm
I hit the send button too soon.

I've got a replacement crystal that'll go in as soon as I mod it so that it transmits in the 50 MHz band.

I'd appreciate any input on this.


Post subject: Baby Monitor modificationPosted: Mon Jun 13, 2005 1:02 pm
In my experience, baby monitors come in two varieties:
1. Discrete designs (perhaps with some IC's)
2. Single-chip designs

In the first case, you might be able to modify the PA stage for more power. In the second, you probably can't do anything. That's how the FCC wants things - hard to make mods that make them illegal for the intended use.

You might check to see what you've got, and let us know.

Good Luck!


Post subject: Posted: Mon Jul 04, 2005 3:32 am
I don't get what you're saying. "It's hard to make mods that make them illegal for their intended use." What does that mean? If it's operating under part 97 rules in ham bands then it's legal. I can modify and homebrew anything I want as long as I follow the rules for part 97. Now, as far as the actuall device. This thing's got a a simple PCB board. There's no IC.


Post subject: Posted: Wed Jul 20, 2005 12:22 pm
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Posted  11/12/2012
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