Extending fob / alarm operating range.

Did this today worked a treat

Works a treat - many thanks!!!

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.

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

talkingcars wrote: 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

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

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