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Re:Extending fob / alarm operating range. 9 years 7 months ago #148761

Did this today worked a treat

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Extending fob / alarm operating range. 5 years 2 months ago #189025

Works a treat - many thanks!!!

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Extending fob / alarm operating range. 3 years 9 months ago #193413

Sorry to drag up an old thread but I would be tempted to make it 3/4 of a wave lenght. Converting to 1/2 wave will throw out the impedence, so to get the full performance you would need to add a matching system, all though this does not matter too much for recieving you should get even better performance by going to a 3/4 wave. Ideally a matched 5/8th wave would be even better.
The following user(s) said Thank You: cairnsys

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Extending fob / alarm operating range. 3 years 9 months ago #193435

For us stupid ones, what length of wire would you suggest?

Home to black Alfa Romeo 159 3.2 V6 Q4 ,green MGF VVC and red MG Maestro T16.

MG - the friendly marque.

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Extending fob / alarm operating range. 3 years 9 months ago #193457

For us stupid ones, what length of wire would you suggest?

I would add an additional 35cm so total length including original wire = 52.5cm
The following user(s) said Thank You: talkingcars, Devinci

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Extending fob / alarm operating range. 3 years 5 months ago #194277

And on my way to the garage right now :whistle:

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Extending fob / alarm operating range. 3 years 5 months ago #194302

What a magnificent bit of radio theory ( a treat for all of us radio hams) , god -we will be on to Standing Wave Ratio's in UHF transmission lines next.

Unfortunately I have a TF mk2 with SCU and Pektron fob (no aerial ) -the only way to alter this one is to dig inside the SCU and track down the UHF transmission chip and its thin film wave guide .

Mike

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