Society of Robots - Robot Forum

Electronics => Electronics => Topic started by: cooldog on November 09, 2007, 04:13:25 PM

Title: crystal
Post by: cooldog on November 09, 2007, 04:13:25 PM
i got a r/c tank but it didn't come with a remote. on the bottom it says that the fequency is 27 MHz is it possible to buy a crystal for this fequency
Title: Re: crystal
Post by: Steve Joblin on November 09, 2007, 04:42:25 PM
I would call up the place where you got it and have them recommend an appropriate remote... the frequency is one aspect, the number of channels is the other.
Title: Re: crystal
Post by: cooldog on November 09, 2007, 06:49:29 PM
i got it from a second hand store but it was orginaly from radio shack and i know it has 3 channals. but i only need 2
Title: Re: crystal
Post by: nottoooily on November 09, 2007, 06:54:13 PM
Aren't there dozens of 27Mhz frequencies used by RC cars? All approximately 27, but different in the decimal places.

Title: Re: crystal
Post by: cooldog on November 09, 2007, 06:56:33 PM
not sure
Title: Re: crystal
Post by: creedcradle on November 09, 2007, 07:21:39 PM
i got a r/c tank but it didn't come with a remote. on the bottom it says that the fequency is 27 MHz is it possible to buy a crystal for this fequency

yes. but not exactly 27Mhz.. it runs like 27.XXXMHZ , it is so easy to find this crystal
Title: Re: crystal
Post by: cooldog on November 09, 2007, 07:33:49 PM
is that a exact crystal or do i need to find the decimal places
Title: Re: crystal
Post by: Admin on November 09, 2007, 08:55:51 PM
You will need the decimal places.
Title: Re: crystal
Post by: cooldog on November 11, 2007, 06:42:48 AM
how do i do that
Title: Re: crystal
Post by: cooldog on November 27, 2007, 03:33:31 PM
ok thanks guys

i was looking at this reciver and transmitter but it says that to use it as a primary control you need a micro controller, WHAT DOES THAT MEEN?
http://www.allelectronics.com/cgi-bin/item/JS-6/search/6-CHANNEL_TRANSMITTER_AND_RECEIVER_.html
Title: Re: crystal
Post by: bens on November 27, 2007, 04:44:25 PM
I didn't really look at the page in much detail, but I think the Vex receiver outputs all 6 of the channels using a single line (e.g. the first pulse on the line would be for channel 1, the second pulse for channel 2, etc), which means you need to use a microcontroller to take that output and break it into six distinct channel outputs.