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From: "Ken Taylor"
Subject: Re: cell phone 3 watt amp??
X-Newsreader: Microsoft Outlook Express 6.00.2800.1106
Date: Thu, 2 Jan 2003 12:19:05 +1300
NNTP-Posting-Date: Thu, 02 Jan 2003 12:17:10 NZDT
"Smile, it can only get WORSE" wrote in message
> Hi everyone,
> Does anyone have a schematic diagram for a 3 watt booster for a cell
> phone (800 mhz only)?
> I have a low power cell phone and live in a fringe area and a little
> boost on transmit would be a big help.
> I know I can make a transmitter amp easily enough and a receive preamp
> should be fairly easy....but the full duplex operation presents a
> problem since there is no transmit/receive relay due to the very
> nature of the cell phone.
> Do they use an electronically tunable duplexer to isolate the rx and
> tx signals and prevent desense of the receiver when the transmitter
> kicks in?
> I see some horrifically expensive amps on the market, but they are
> devoid of technical specs, don't come with schematics and I would like
> to aviod them if possible. Nokia just pretends they don't exist (as
> does my cell phone supplier):>:
> We only have 800 mhz in our area, so I do not need to worry about
> interfacing 1900 mhz rx and tx hardware to an 800 mhz design.
> Thanks all.
Depending on the cell system this may not help. Tehre are timing constraints
in some systems.
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