hey,
so its little complicated, i have 2 mobile UHF radio (kenwood) and i need to extend a specific frequency with them. there is a product that do that but cost a lot of money.
here is a picture that show how repeater should work:
the 2 portable radios have a plug that used to connect an handset to them:
im thinking how with those i/o i can make something that will transfer RX from one radio to another and will transmit it while pressing the PTT (push to talk) of the transmitting radio.
the programming of the RX and TX frequencies isnt a problem its just the "thing" between the RX radio and the TX radio.
thanks in advance
You'd have to figure out the actual frequencies used and if no premade Tx/Rx modules can be found, you'd have to build from scratch. A dumb repeater is not really an Arduino project, a dedicated radio forum will be much more helpful.
BananaBom:
i need to extend a specific frequency with them. there is a product that do that but cost a lot of money.
Amateur radio repeaters that perform this function are common, but are neither cheap or simple to implement, when all the legal requirements are taken into account.
The products cost a 'lot of money' for good reasons, why do you presume there is cheaper option ?
How much experience do you have in this field, do you have an amateur radio license and where in the world are you ?
He also must coordinate with the local repeater coordination committee. If he causes interference with other users of the 2-meter band, the FCC will pay a visit! Also, he needs to automatically identify the transmitter so if interference is caused, people will know where it is coming from. Read the FCC rules!!!!!
In addition to all that you will need a cavity filter to put a notch in the RX path at the TX frequency and another in the TX path at the RX frequency. Otherwise the radios will be desensitised.
You will also need a radio license to implement this legally, and you need to obtain a call sign for it and send the call sign in Morse code at set intervals and during swap over.
I did build a 70cm repeater controlled by a microprocessor in 1976.
i think you guys has been taken it to the wrong way.
all my doing is legal and its not more than learning propose.
i saw on youtube some guy that made a portable repeater and used a pre made controller
( here )
and then i saw this pre-made micro-processor chip that do the same job
( here )
i know that making a dumb repeater cable is possible
( like this motorola maxtrac cable here )
if someone can send me some tutorials that could help me
i really want to learn from that project
thanks for everyone !
BananaBom:
i think you guys has been taken it to the wrong way.
all my doing is legal and its not more than learning propose.
You could re-assure the forum by saying where in the World you are and whether you have an Amateur Radio Licence, you have been asked .................
In your first post you said your raidio was "mobile UHF radio (kenwood)", which is an odd thing for a properly licensed radio amateur to say.
You might well have a Kenwood radio, but there are a lot of different Kenwood radios out there, so if you were asking for advice on how to set them up as repeaters, why did you not state the model numbers ?
