Technical, Techniques, Hints, and Tips > Radio Equipment

27Mhz FM

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roycv:
Hi all, I wonder how many of us still use 27 Mhz FM equipment?
I have a Futaba M series and also use Micron, all multi channel, Futaba with Micron Rx. is an excellent combination.

In the 100 page Model Boats Kits Special there is a RTR boat called Slingshot.  According to the text of the article it uses FM crystals and they will be available by the time the article was read from Ripmax. 27 Mhz FM crystals are like hens teeth!

I rang Hobby Store at Parkway N.W. London  and spoke to a very helpful chap and he said they did not have any. ( He actually uses 27 Mhz FM crystals himself, and has to buy direct from Hong Kong.)
But he phoned Ripmax and rang me back and said there were no plans at the moment to stock them.

BUT he gave me this site where you can get them from.

www.rc-mushroom.com

They are $9.51 per pair +p&p.  There is a choice of 9 crystals.

Regards to all Roy

Youngat65:
Some of the Heng-Long tanks that have smoke and sound are 27mhz FM they do four different frequencys and I have seen them for sale at  www.tankzone.co.uk
                                                                                     Cheers
                                                                                          Bob B

Fast Electricals:
Are you sure that you need FM crystals? The only reason why FM would differ from AM would be if the receiver used a different IF frequency from a standard AM receiver (455KHz) or if the crystals were a non standard size. 

Neil

Youngat65:
Neil are you sure this debate has raged before on this forum I have tried Futaba m FM crystals in my Futaba m AM set and they just don't work I,m sure that this is too simple a statment and it won't be long before we get some technical statment telling us that there is no reason why they shouldn't work
                                                                                      Cheers
                                                                                         Bob B
                                                                                           

Doc:
You ready for this?
Crystals can be 'cut' on one of three different axis (X, Y, Z).  Depending on how they are cut, some will not vibrate (oscillate) like they should, or at least where you want them to (frequency).  An FM crystal in an AM radio transmitter is probably vibrating/oscillating, just not on the channel that you can use (or even the same band maybe).  Sort of like using an infrared lightbulb in your work shop.  It puts out lots of 'light', you just can't see it.  Same for the radio's receiver...
 - 'Doc

Like french bread?  Long sandwiches or very small ones?

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