AboutKen Myers Expertise I can answer beginning, advanced and expert questions about electrically
powered R/C model aircraft, and many questions about R/C model aircraft of
all types, except helicopters. I`ve been building, flying and designing R/C
model aircraft for 40 years.
Experience I have been building and flying radio controlled model aircraft since 1960. I'm the president of the Electric Flyers Only, Inc., located in southeasten Michigan. I'm a past president of the National Electric Aircraft Council. I'm vice-president of the Midwest R/C Society. I was president and main founder of the UFO (Union Lake Flying Organization). I've built and flown most types of model aircraft except helicopters.
Expert: Ken Myers Date: 6/22/2008 Subject: crystals in receiver
Question QUESTION: In a radio controlled car receiver,specifically a Futaba Digital Proportion 4 channel micro ,75 megahertz receiver, can I replace the crystal in the receiver with a different size than is in the transmitter.
ANSWER: Hi Brenda,
I'm sorry, I am unclear of what you are asking me. You can purchase Futaba crystal sets which contain a transmitter crystal and a receiver crystal that are set up to operate on the same frequency in the 75MHz band. For the radio to operate, they need to be matched.
If you are asking about physical size, as far as I know, all the Futaba receiver crystals are the same physical size. I could be wrong, since I've not used Futaba radio equipment in a long time. I do know there are other brands that do have crystals of different physical size to fit specific radio systems.
Tower Hobbies, http://www.towerhobbies.com, carries Futaba crystals. Just do a search on their site and you should find what you are looking for.
Please feel free to ask any follow up questions, as I said, I'm not sure what you are specifically asking.
Sincerely,
Ken
---------- FOLLOW-UP ----------
QUESTION: Does the box that you put the crystal in have to be the same frequency as the crystal.
Thank You
Answer Hi,
The crystal must match the frequency that the transmitter is on. That is why they are sold in sets. The frequency is usually noted with a little paper-like flag on the crystal. The various frequencies within a band, like 75MHz, are determined by the vibrations of the crystal. As long as you match the crystal in the transmitter to the crystal in the receiver (the box you may be talking about), the radio will operate as intended.
