Omega Owners Forum
Chat Area => General Discussion Area => Topic started by: Martin_1962 on 09 February 2009, 21:35:53
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For my fob repair I would liek to monitor the RF out, so would need a receiver.
Does anyone have an old or unwanted scanner they no longer want?
Or where I could get a kit I could build of one?
Thanks
Martin
I tried freecycle but they have changed their rules so I deleted all of my group memberships
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Hi Martin, Give us a clue on frequency and band you need to cover !
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Somewhere around 433.92Mhz aren't they?
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Yes - I know there are a lot of electronics experts and magies on here so worth a go ;D
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Will keep an eye out. 433.92 is within the 70cm amateur band. It is useful to get some confirmation that they are transmitting. The 3 different types have distinctive sounds too.
You can get little receiver modules for WT exempt bands. In fact, I think I might have one or two in the junk box. Will have to check....
Kevin
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Hi Martin,
not too sure what your trying to monitor and why?, Freq., Demod Audio, FSSK Data, Spectrum, O/P power, Signal Strenght?
Give us a clue?, Im a Radio Communications Engineer, might be able to help? :y
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Thinking a little further, if you simply want to establish that it's transmitting you could knock up a simple diode detector probe which you could attach to the antenna strip on the PCB. Put a bit of gain on it and you could have an LED that flashes whenever it transmits.
Kevin
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I use a scope.....and a bit of wire as an aerial
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Hi Martin,
not too sure what your trying to monitor and why?, Freq., Demod Audio, FSSK Data, Spectrum, O/P power, Signal Strenght?
Give us a clue?, Im a Radio Communications Engineer, might be able to help? :y
Basically that it is transmitting and not just flashing the LED. I am not too well up on this - I am more practical level.
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Thinking a little further, if you simply want to establish that it's transmitting you could knock up a simple diode detector probe which you could attach to the antenna strip on the PCB. Put a bit of gain on it and you could have an LED that flashes whenever it transmits.
Kevin
Sounds usefull :y
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I use a scope.....and a bit of wire as an aerial
I don't have one of those either!
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OK My electrical knowleage
I know what components do, I can read diagrams, I can tackle simple repairs and modifications, but I can't design a circuit or knock up somethink without instructions.
An example of my level is I was able to study the circuit diagram of a VCR, find a good source of IF, and mono sound, and a good place to reinsert stereo and also trigger stereo light, I had to solder 1 wire to one board, replace an interboard loom, cut one track and solder another lead back. I also fitted a load of phono sockets to the back panel.
Kevin and Mark are beyond me but I would understand if they took it carefully.
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The simplest option for you Martin would be to buy a cheap receiver module i.e.:
http://cpc.farnell.com/jsp/search/browse.jsp?N=411+500001+1003120&Ntk=gensearch_003&Ntt=433mhz+receiver&Ntx=
and monitor the ouput with a scope or a simple LED.
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The simplest option for you Martin would be to buy a cheap receiver module i.e.:
http://cpc.farnell.com/jsp/search/browse.jsp?N=411+500001+1003120&Ntk=gensearch_003&Ntt=433mhz+receiver&Ntx=
and monitor the ouput with a scope or a simple LED.
Blimey! They're cheap these days. £3.92 for an AM module is a no-brainer really. Not worth messing about with anything else. LED on the output and job's a good'un.
It will probably get triggered by every weather station / car fob / wireless alarm in the neighbourhood but then again, you don't have to connect an antenna to it.
Kevin
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The simplest option for you Martin would be to buy a cheap receiver module i.e.:
http://cpc.farnell.com/jsp/search/browse.jsp?N=411+500001+1003120&Ntk=gensearch_003&Ntt=433mhz+receiver&Ntx=
and monitor the ouput with a scope or a simple LED.
Blimey! They're cheap these days. £3.92 for an AM module is a no-brainer really. Not worth messing about with anything else. LED on the output and job's a good'un.
It will probably get triggered by every weather station / car fob / wireless alarm in the neighbourhood but then again, you don't have to connect an antenna to it.
Kevin
Tell me what I need and what else is required and I'll have a look :y
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Hi Martin,
not too sure what your trying to monitor and why?, Freq., Demod Audio, FSSK Data, Spectrum, O/P power, Signal Strenght?
Give us a clue?, Im a Radio Communications Engineer, might be able to help? :y
Basically that it is transmitting and not just flashing the LED. I am not too well up on this - I am more practical level.
Maybe then a simple Frequecy Grabber / Finder, I remember buying one from Maplins a few years back for arround £30. it captures your Transmitted signal and displays Freq. and Signal Strenght.
Would have thought eGay for a second hand one would be a good place to start. :y
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its the same as this Martin
http://www.ukmidlandscanner.co.uk/r2rev.htm