for the receiver unit recommends a 17 cm long wire for the antenna. If I improve the antenna can I get a longer range?
Do you think that I could get 100 M range if the transmitter was powered with 5V?
Length in meters = 300/ f (in MHz) so 300/434 = 0.7 which is about 2.3 feet.
Out of curiosity where does this equation come from? Is this only for straight wire antennas?
So we want the antenna to be one wavelength long? Why do they suggest ~ 1/4 then?
The maximum range of the transmitter is 500 ft. The range is dependent on its supply voltage (2 to 12 V). My breadboard prototype worked perfectly when I had the transmitter powered at 5 V.
I have assembled the circuit on protoboard and am powering the transmitter with 11.2 volts from a three cell lipo battery. Now, however, the transmitter is starting to heat up the entire circuit through its connecting wires, falsely raising my temperature readings!
The data sheet (pdf) for the receiver unit recommends a 17 cm long wire for the antenna. If I improve the antenna can I get a longer range? Do you think that I could get 100 M range if the transmitter was powered with 5V?
Thanks for the help everyone!
I figure I will start out with a ½ wavelength dipole antenna both in the transmitter and the receiver. I will then start looking at yagi antennas for the receiver if I can't get the range I need.
A license, eh?
Even if my transmitter only has a range of 100 M or so? Hmm. I'll have to do some research into this. Thanks for the heads-up.
Where would I go to take these questions?
Is there a class that I would have to take?
The modules are intended for licence free operation under FCC part 15 rules. Have a look at this document, page 20 of the pdf describes what is allowed at this frequency:
https://www.electro-tech-online.com/custompdfs/2009/08/oet63rev-1.pdf
434Mhz is only authorised by the FCC for "Intermittent Control Signals" which is not your application.
However 315Mhz modules are commonly available in the USA for any data transmission. The datasheet on the Sparkfun website shows two variants of the module, 434 and 315Mhz.
434Mhz is for use in Europe, 315Mhz is for use in the USA.
I dont think you have to worry about getting your amateur radio licence for this.
JimB
He shows his location as Detroit which I believe is in the USA some where, which is why I quoted the FCC regulations. Contrary to popular belief by some Americans, the FCC does not have jurisdiction beyond the borders of the USA.But I don't think he's in Europe. He's in the USA. Therefore, you're saying he'll have to modify his frequency to 315MHz.
try this simple antenna made from coax cable (and you can use RG-174 cable which is the same diameter as 16Ga wire). make the dimension for each of the two elements (the exposed center wire and the folded-back braid) equal to 19cm. you can skip the part about copper tubing, and just fold back 19cm of the ground braid over the cable insulation. keep the braid intact so it acts like a metal sleeve over the outside of the cable. this will give you a good half-wave dipole (each element, the folded back braid and the center wire are each 1/4 wave) that doesn't need to be supported because it's the end of the cable. at the other end of the cable, the center wire connects to the transmitter antenna terminal, and the shield braid connects to the transmitter ground (either a metal shield or a ground trace on the pc board will do)
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