Copyright: 1996 - 2024
BSEE - KB3UON
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
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My Hobby Website:
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.
Below are the old forum threads, including responses to the original posts.
|-- Amateur Radio
Gripes & Humor
-- CAE, CAD, &
Test & Measurement
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.
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.
might check to see what you've got, and let us know.
Post subject: Posted: Mon Jul 04, 2005
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.
subject: Posted: Wed Jul 20, 2005 12:22 pm
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