RF Module

[dhouston]

Hello dhouston,
The file you posted (UR19A.PDF) has a nice transmitter schematic.
But, the complete details of L1 are not given.

L1 is a circuit board trace that acts as the antenna. If you're going to build something, build the one in the http://jap.hu/electronic/rf/el9805.pdf link.

Do you have a reciever schematic for this transmitter ???

X-10's RR501 used almost exactly the same circuit as the Ming receiver for which you found a schematic. Or, you can do a Google search on "RR501 Orysh schematic".

The RF1 transmitter and receivers shown on the site cited by ra68gi http://www.modielectronics.com/RFPG_1.htm are the ones made by Wen Shing (or are clones thereof) that I mentioned earlier. You cannot go wrong with them.

OOOPS! The RF modules in both links from ra68gi are from HiMark (Taiwan). X-10 now uses similar HiMark modules in their latest interface (CM15A). As I recall, HiMark has schematics and parts lists on their website.

[shahidali55]

I finally found something on google that looks real easy to make.
Can someone tell me if these circuits will work and what range they might have?
http://www.cappels.org/dproj/LCRFLIN...tr/TRFxmtr.htm
http://www.cappels.org/dproj/LCRFLIN...rF/TRFrcvr.htm

[shahidali55]

Has anyone got any other ideas???
I just need a simple circuit that is capable of transmitting and recieving data.
Range - 25 to 30 metres...
Frequency - Anything . . .

[dhouston]

I just remembered this one.

• http://www.piclist.com/techref/io/rf/simpletx.htm

[Melanie]

Shahidali, as you seem to want to build one yourself instead of buying ready made devices, the final result and performance will very much depend on your build quality and the quality of components you use and the antenna you employ at both the transmitter and receiver and also the frequency you end up operating on. Since the inductor will be constructed by you, I emphasise build quality. So, why not try building some of the many circuits you now have acquired (including some you've found yourself), then come back and tell us how you've done and how well they have performed. However, without some good test equipment, or alternatively at least a tuneable receiver in the frequency band of your transmitter, you will have a hard time achieving a measure of success whilst working in the dark, as you won't even know what transmit frequency your construction has ended up with.

[Acetronics2]

A link to visit : http://www-k.ext.ti.com/srvs/cgi-bin/webcgi.exe?Company={5761bcd8-11f5-4e08-84e0-8167176a4ed9},kb=analog,case=obj(4270),new

Alain

[shahidali55]

Does anyone know any replacement for MPSH34 transistor ???
It should have very low capacitance...