REQ: walkie-talkie circuit board diagram
Ali Yildirim
Hi,
I'm sorry if this is a wrong newsgroup to ask this question to.
I want to build a walkie-talkie set to take with us when my fiancee
and I go hiking and biking. However, there's a small problem:
I don't have a circuit diagram for a walkie-talkie set or FM
transmitter/receiver set. I'm not looking for anything fancy.
Something simple, not expensive, I can build myself, and with
a range of 0.5 to 1 mile is what I'm looking for. If anyone has
circuit diagrams for FM walkie-talkie sets and would email it to me,
I would appreciate it very much. Any pointers to web sites
[electronic circuit diagram archives] that have this kind of information
would be helpful, too.. Thanks in advance,
Ali Yildirim
ay...@lehigh.edu
yild...@popmail.wefa.com
yild...@wefa.com
Dan Fraser
You may not want to hear this but the schematic is not the hard part. It
is incredibly difficult to get RF transmitters/receivers to work that
well. Also, you are dealing with a power level that will require
licensing which means getting type approval from the government. To make
it work you need thousands of dollars of equipment.
Do you have access to a VHF or UHF equipped test bench and are you
prepared to spend dozens if not hundreds of hours getting it rught just
to have a government inspector come down on you for your trouble. Of
course, if you have a valid amateur radio license, you can get away with
the government part. However, if you did, you would have a copy of the
ARRL handbook which already has such circuits in it.
Assuming you are not a licensed amateur or have a proper test bench
available, in the time it would take to build, you could work at
McDonalds and earn the money for a pair of Motorola radios and have
change left over.
However, if you are a electronics student wanting experience to make
yourself more employable, it could be worthwhile experience. I build
custom circuitry as a second job. I used to try to make a living from it
but but it just took to much time for the little money back. The only
cost effective things to build are those that do not already exist. To
build yourself what has been in mass production for over 30 years is an
exercise in heartbreak.
I am now trying to build a device with 100' range for someonae and am
using standard off the shelf modules from companies advertising in
Electronics Now magazine. However, again, stuff with 1 mile range is
limited to FCC or other government type approved equipment (I assume you
are in the USA as no one else would have used miles) or to licensed
amateurs.
Good luck anyway if you decide to try.
Dan