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From: dana@lando.la.locus.com (Dana H. Myers)
Newsgroups: sci.electronics
Subject: Re: Boosting output of a little walkie-talkie
Message-ID: <15099@.la.locus.com>
Date: 10 Aug 90 21:30:06 GMT
References: <90080614412836@masnet.uucp> <1990Aug7.182544.7140@ns.network.com> <1063@tsdiag.ccur.com>
Sender: news@locus.com
Organization: Locus Computing Corporation, Inglewood, CA
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In article <1063@tsdiag.ccur.com> davet@tsdiag.ccur.com (Dave Tiller N2KAU) writes:
[ talking about a power amp for a walkie-talkie and using an op-amp ]

> The easiest method, if it were legal, would be to use a final
>transistor current amp (common collector).  There are lots of transistors 
>that'll handle 27 MHz just fine.

   Common collector? Hmm, most of the RF amplifiers use NPN transistors in
a common emitter configuration. At 27 Mhz, you could even use a cheap
power MOSFET like the IRF511; I built a 10m amp using one of these and
got something like 13 dB+ of power gain at 29.0 Mhz (15W out). Of course,
the MOSFET amplifier was common source, with about 50mA of idle current.
What was funny, for that project I built an RF-sensed T/R switch, and ended
up using the same active device as the power amplifier to drive a relay...

  Once again, however, please DO NOT build your own power booster for a 
27Mhz or 49Mhz handie talkie.
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* Dana H. Myers KK6JQ 		| Views expressed here are	*
* (213) 337-5136 (ex WA6ZGB)	| mine and do not necessarily	*
* dana@locus.com		| reflect those of my employer	*
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