RFD21733 Datasheet, PDF (8/76 Pages) List of Unclassifed Manufacturers – Compliance Approved 2.4 GHz RF Transceiver Modules with Built-In RFDP8 Application Protocol

© Copyright, RF Digital
7/10/2011 1:40 AM
Patents Pending
RoHS CE • ESTI
RFD21733 • FCC • IC
RFD21743 • FCC
Approved & Certified
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Tel: [phone] • www.RFdigital.com
Fast Answers: [e-mail]
RFDP8
RF Module
RFD21733
RFD21735
RFD21737
RFD21738
RFD21739
RFDP8
RFDANT
RFD21742
RFD21743
RFD21772
RFD21773
KEYFOBs
Differences between RFD21742 and RFD21743 RFDANTs
The RFD21742 and RFD21743 are 100% identical hardware, the only difference between the two is firmware loaded
at the RF Digital factory.
The RFD21742 is in compliance with CE / ETSI emission requirements and is not for FCC.
The RFD21743 is in compliance with CE / ETSI emission requirements and is FCC Certified and Approved.
The high performance of the RFDANT for FCC requires it to work in a 50% duty cycle mode, which means that when
you are running it in its 9600-8N1 UART mode, you can send up to 24 bytes in a row and then you must wait a
minimum of 24 byte lengths which is about 24mS before you send up to another 24 bytes. For example you can
also send 12 bytes, wait 12mS and then send 12 bytes again, effectively yielding a 50% duty cycle. Note this is only
a transmit limitation with the RFDANT, it is not related to receive, so if you have a RFD21733 sending 100% duty
cycle at full speed, you can receive that with either RFDANT and it will be fine. But when you go to transmit, if you
are using the RFD21743 you will need to use a maximum of a 50% duty cycle for the USA and FCC. However when
using the RFD21742 which is for Europe and the CE / ETSI markets, there is no duty cycle limitation.
That is the reason there are two part numbers for the RFDANT, the RFD21743 is 50% UART duty cycle for FCC and
the RFD21742 is CE and ETSI with 100% duty cycle.
So if you plan on selling into the USA market place, then use the RFD21743, if you are Europe ONLY, then you can
use the RFD21742. Also, of course you can use the RFD21743 for USA and Europe.
If you are sending in switch mode using the RFD21742, it will send a new packet every 16mS and the hang time for a
switch receiver in mode 6 or 7 is 50mS. Where with the RFD21743 it will send a new packet every 24mS to work
within the 50% duty cycle limit for FCC and IC.
If you require Canada (IC) Approval for the RFD21743, please contact [e-mail].
The impact with switch mode is hardly even noticed between the RFD21743 and RFD21742.
Most common applications are typically with burst data less then 24 bytes per burst, so the difference between the
RFD21743 and RFD21742 is negligible, nevertheless the choice is still available for you and they are pin for pin
compatible.
Once you test an RFDANT, you will be truly amazed with its performance.
FCC
CE • ETSI
RFD21743 RFDANT
Plugs into your PCB using its 8 inch long cable.
CE • ETSI
RFD21742 RFDANT
Plugs into your PCB using its 8 inch long cable.
Free Applications Support • Email your application questions to [e-mail]
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