Matching Handsets to Receivers

[Grumpy pants]

I've got an 80's Futuba receiver in my M.B and I can only get 1 handset to work with it.

I've tried a dozen different handsets with 27mhz, am I missing something?

I did remember to swap the crystals to match each time I swapped the handset.

The handset that works with the car is a much more modern Ranger 2.

It just struck as odd, or I'm missing something very simple.

[SteveU30]

It would probably help if you could post the exact model number of the receiver in question.

[Grumpy pants]

It would probably help if you could post the exact model number of the receiver in question.

Apologies Steveu30 you are absolutely right- it's Been a long day!

Thank you for the prompt.

Futuba FP-R102GR

AM 27MHz

[twisty]

I seem to remember something about it`s the way the crystals are cut,not all makes of crystals will work in all makes of handset.

All makes of crystals WILL work with all RX`s but rule of thumb is to always use the correct brand of crystals for the handset.

Hope that helps.

[waterbok]

Try the search fuction, I believe there is quite a good thread about this somewhere on TC explaining why certain brand 27mhz TX won't work with other brand Rx.

edit: think i am mixing up am and fm, the problem lies with different brand 40 and 75 mhz FM (frequency shifts), 27 am should be no problem matching.

did you test with a matching pair of 27 am tx and rx cristals?

[beefmuffin]

i've had problems with this trying to use novak receivers which are specific to certain brands of Tx regardless of Freq/Modulation. In that particular case it seems that the Novak is expecting transmissions which are compressed into a very narrow band... i guess to reduce interference from other Tx's. However if your Tx doesn't work this way then your own transmitter falls prey to the same effect as other people's Tx's - it doesn't resolve properly within the extremely narrow Freq band and the transmissions are too fuzzy for the Rx to translate.

of course, this may be a specific problem... but the more i've seen different brands and models of radio gear the more i realize the extent to which they - at one point at least - tried to reduce inter-compatibility between brands via proprietary tech. this isn't entirely unexpected since adherence to standards is something we see slowly culminating with modern radio gear - at some point it became a competitive edge to tout compatibility with standards. you see it with wiring harnesses for Rx's - where there's no functional advantage to one format over another unlike battery connectors. and it looks like the same thing was true (is still true?) for some systems. looks like there was a dip in the phenomenon of differentiation and then a return to it with the advent of digital FM systems.

not sure if this is related but it's an observation i've noticed with a hefty amount of frustration trying to make transmitters and receivers play nice. it especially sucks when the difference is in the crystal for AM systems because there's no real reason for them to differ in the way they generate harmonics with the possible exception of higher purity crystals producing more precise tuning with fewer secondary harmonics, etc. but i doubt this is that widespread of an issue with xtals.

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