RF control
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Posts: 46,084
What type of setup do you think is in simple RF communication
devices like RC cars and the like? Does the transmitter as well as
the receiver (the car) need a PIC, or does it need something more
advanced? Also, I seem to see a lot of products like these use the
27Mhz band. Can anyone use that frequency that wants to? Also, why
did Stamp settle on 900Mhz and 433.92Mhz for its RF devices?
I am obviously new to this area and would appreciate any help.
Thanks
Patrick
devices like RC cars and the like? Does the transmitter as well as
the receiver (the car) need a PIC, or does it need something more
advanced? Also, I seem to see a lot of products like these use the
27Mhz band. Can anyone use that frequency that wants to? Also, why
did Stamp settle on 900Mhz and 433.92Mhz for its RF devices?
I am obviously new to this area and would appreciate any help.
Thanks
Patrick
Comments
The Federal Communications Commission (FCC) is responsible for allocating
various bands of frequencies for specific purposes under agreements with
other countries. Some of these bands are set up for commercial purposes
such as television broadcasting, AM and FM radio broadcasts, etc. Some are
for non-commercial licensed use such as Amateur Radio and Public service
(fire,police,etc.) A few bands have been set aside for non licensed use
provided the equipment used has limited range. Some bands like those you
mentioned along with a few at 49 MHz may be used for different purposes like
RC control. These are designated as Part 15 devices. The equipment must be
type accepted by the FCC (tested and certified to comply) and must not cause
harmful interference to other licensed services. Also, there is no immunity
from interference from other devices guaranteed. Some frequencies are
better than others as they have less range, more range, less man-made and
atmospheric noise, more bandwidth, higher or lower equipment costs, etc. so
the selection of bands is determined by the manufacturer within the
limitations of the FCC. Some modes of modulation are not compatible with
others so certain types of operation tend to be grouped in specific bands
(networking).
So, there are many considerations when selecting bands of operations, and
this dialog has merely scratched the surface in very general terms.
Hope this helped,
jim
http://www.geocities.com/jimforkin2003/
Original Message
From: rodroddy_778 [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=fgF5n79yl0_rvdtqsm6NhTsUpidLTWuDzuMX0LAkSvoQiK3iej_FkkohYrAJBEPPfj51CsiYC3s2BbtIpBs]rodroddy_778@y...[/url
Sent: Tuesday, January 20, 2004 5:40 PM
To: basicstamps@yahoogroups.com
Subject: [noparse][[/noparse]basicstamps] RF control
What type of setup do you think is in simple RF communication
devices like RC cars and the like? Does the transmitter as well as
the receiver (the car) need a PIC, or does it need something more
advanced? Also, I seem to see a lot of products like these use the
27Mhz band. Can anyone use that frequency that wants to? Also, why
did Stamp settle on 900Mhz and 433.92Mhz for its RF devices?
I am obviously new to this area and would appreciate any help.
Thanks
Patrick
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