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Old Apr 25, 2004, 10:47 PM
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Keennon's Avatar
California
Joined Oct 2002
410 Posts
Looking for Micro Receiver on 75 Mhz

I have a young friend working on a tiny battlebot with a question. He needs a JR compatible 4 ch receiver on FM 75 mhz, I need to find out the specific frequency, it might be ground channel '4' whatever that means. The question is do the small receivers like the Micro Joule or Penta or JMP have oscillator sections that are compatible with 75 Mhz? The boy is very enthusiastic, so I'd like to help him out, he also has made some small R/C planes that are very nice.

Any help would be appreciated.

Thanks.
-Matt Keennon
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Old Apr 25, 2004, 11:26 PM
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chaitanya's Avatar
Pune-India
Joined Nov 2003
120 Posts
matt,
there is a JR R-700 receiver on 75MHZ available at,
http://www.robotcombat.com/marketplace_rc.html

Don't know wether u are looking for a micro receiver, thought this might help.

I don't think the JMPs etc. will work on 75 by just changing the crystals The L-C components in the oscillator ckt will have to be adjusted/changed for 75MHZ operation.
If done so the JMPs will be good even till 200MHZ!
cheers,
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Old Apr 26, 2004, 02:03 AM
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JMP_blackfoot's Avatar
United States, OH, Galena
Joined Jul 2003
1,668 Posts
Quote:
Originally Posted by Keennon
I have a young friend working on a tiny battlebot with a question. He needs a JR compatible 4 ch receiver on FM 75 mhz, I need to find out the specific frequency, it might be ground channel '4' whatever that means. The question is do the small receivers like the Micro Joule or Penta or JMP have oscillator sections that are compatible with 75 Mhz? The boy is very enthusiastic, so I'd like to help him out, he also has made some small R/C planes that are very nice.

Any help would be appreciated.

Thanks.
-Matt Keennon
Matt,

The local oscillator circuit of the JMP 72 MHz will work at 75 MHz.
It is the input LC tank circuit which will have to be retuned for best sensitivity.
I can send you the simple procedure to do that.
For your information, the 35/36 MHz receivers only differ in the adjustment of the input tank circuit, and they work from 35.0 to over 36.5 MHz, so 72 to 75 is no problem for the "72 MHz" version.
Hope this helps.
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Old Apr 27, 2004, 09:54 AM
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MooseFlyR's Avatar
Slingerlands, NY
Joined Feb 2003
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Channel 4 would be 27 Mhz. (channels 1-6 in the US)
75 Mhz. channels go from 61 -90.
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Old Apr 27, 2004, 12:57 PM
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United States, OH, Galena
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Quote:
Originally Posted by MooseFlyR
Channel 4 would be 27 Mhz. (channels 1-6 in the US)
75 Mhz. channels go from 61 -90.
If the transmitter is 27 MHz FM, I can prepare a receiver on 27MHz.
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Old Apr 27, 2004, 01:09 PM
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Keennon's Avatar
California
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Thanks for the inputs. I appreciate it. -Matt
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