hello guys,
i need to connect this antenna to the RF links TX and RX so i need help with how to install it
http://www.ekt2.com/products/productdetails?ProductId=49261edd-020b-4117-88d3-0321487f0dee
the thing is it has no wires at all it's just this piece of metal 
thanks in advance 
are you serious?
it's just an antenna, how could it be possible to connect it to the RX TX?
you need a rs232 TTL wireless transceiver on both ends, the antenna can be just a wire of the correct lenght
screwpilot:
are you serious?
it's just an antenna, how could it be possible to connect it to the RX TX?you need a rs232 TTL wireless transceiver on both ends, the antenna can be just a wire of the correct lenght
no i am talking about connecting it to the antenna hole on a 315mhz Transmitter and receiver RF links so my question is should i solder a wire to its inside which has the color of gold or what should i do ?
Give us a link to the 315 MHz module.
you cannot use a 433MHz antenna on a 3xxMHz module, it's too short
any spot of the bottom of the ant will do
screwpilot:
you cannot use a 433MHz antenna on a 3xxMHz module, it's too shortany spot of the bottom of the ant will do
what if i solder a long wire at the bottom will that work out for 315 mhz ?
KeithRB:
Give us a link to the 315 MHz module.
this is the RF links http://www.ekt2.com/products/productdetails?ProductId=751d1eff-dc9a-4234-be84-a71188ef11c6
It looks to have an internal thread at the base so bolt it on to a hole on the PCB?
MarkT:
It looks to have an internal thread at the base so bolt it on to a hole on the PCB?
I didn't understood what you mean ? :
he said that there's a hole that accept a screw in the bottom of that antenna, you will place the antenna over the module and pass a screw trought it to secure\connect the ant
browse the internet for a simple equation that tells you how long must this antenna be
you can use a stupid wire soldered on the module for antenna, just of the correct lenght
screwpilot:
he said that there's a hole that accept a screw in the bottom of that antenna, you will place the antenna over the module and pass a screw trought it to secure\connect the antbrowse the internet for a simple equation that tells you how long must this antenna be
you can use a stupid wire soldered on the module for antenna, just of the correct lenght
according to the datasheet the module can be used for frequencies between 315 to 433 and it says about the antenna
about the screw well if it has a screw yes but i asked this question because i bought the antenna with nothing
what i did is i soldered a piece of wire to where the screw should go and then soldered the wire to the module
waitwaitwaitwaitwaitwaitwait
you CANNOT use a wire to connect an ant to a module, it will work as an ant too and skrew up you signal strenght
you can use a shielded wire for the task and connect it's shield to the module's GND, the other shield's end will not connect to anything (make very close\shrunk connections) OR connect the ant directly to the ant connection on the module someway
are you sure that the module will work with both frequencies?
however this is not a transceiver it's a rx and a tx you may use a pair at 315mhz and another pair at 433mhz, this way you make a transceiver for serial RX|TX
and... develop a "if-checksum-not-ok-resend" feature
yes the datasheet says that it can work between 315 and 433
i am willing to make a transceiver yes but is it possible to use 2 modules of 315mhz ? means 2 RX and 2 TX
well there is no other way than soldering a wire to the antenna gold internal and to the module
yes i know it will work as an antenna , but will it weaken the signal ?
it's way better to use a transceiver because you will have only 1 antenna on each side
but using 2 of this RF will make 2 antennas on each side 
impossible... there's a SAW crystal onboard... cristals are "tuned" for a specific frequency, even the receiver is
two identical couples will interfere
use a rg174 shielded cable or you will turnoff\damage the transmitter and if you are lucky it will output like 1\50 of power
yep
but your module has a way bigger transmitting distance (if you place a good ant) (and if you place yagi antennas you can cover like 2-3 km or more on free air )
here is the datasheet down below maybe i got it the wrong way
so how then can i connect it ! there is no other way
i had a car toy which i broke it and took part of it and the antenna of the Radio controller so what i found is this : the antenna is the same as this one i am using, but it doesn't have a hole in the bottom instead it has a screw, and then like a very tiny bolt which the screw goes in, and that bolt like is soldered to a piece of wire and the wire to the antenna pin on the PCB so it's pretty much the same as my method except that there is a screw and bolt instead of solder
141_RF_MODULE_TX-RX_315Mhz.pdf (869 KB)
toy cars are toys and are intended to get like 30m far away max
i didn't read the entire datasheet but trust me... there are 433 versions inteded for europe and 315 versions intended for usa (laws... you know)
screwpilot:
toy cars are toys
yes i know my application doesn't need more than around that value 
screwpilot:
i didn't read the entire datasheet but trust me...
it's written in the characteristics of TX and RX you don't have to read all of it, i still would like to know what do they mean
but what do you mean by
screwpilot:
there are 433 versions inteded for europe and 315 versions intended for usa (laws... you know)
laws about transmitters differ from country to country
some frequencies are allowed there..... some else not
i say trust me again
the modules may be the same looking but differ by cristal and tuning circuit trim\selection of components
screwpilot:
laws about transmitters differ from country to country
some frequencies are allowed there..... some else noti say trust me again
the modules may be the same looking but differ by cristal and tuning circuit trim\selection of components
ok i trust you, and i know the modules not the same but i was surprise that it's written in the datasheet of the 315mhz module only because i have the 433mhz too and it's not the written
so this is written in the datasheet:
Receiver frequency: 433.92MHZ; 315 Mhz
Transmitter Module Specification:
o Operating voltage :3‐12V
o Operating frequency: 433.92MHz; 315Mhz
it should be a mistake probably only if there is something i am missing, but yes as you said the crystal is for 1 frequency which is usually written on it
It means that the IC allows it to work on either frequency, but the board is designed with the components to work on only one frequency, chosen at time of manufacture.
You want a 1/4 wavelength antenna. It isn't terribly critical. A wavelength is determined by the speed of light and the frequency. 300 million meters per second, 433MHz (million cycles per second), so 300/433 = 69cm. You need 1/4 of that, or about 17.3cm.
Just cut any old wire to about 17.5cm, strip a bit off one end, and solder into the hole. No need for screws, the hole is not threaded.