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All Forums >> RC Cars, Buggies, Trucks, Tanks and more >> RC Car Radio Equipment >> differnt answers from different people
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differnt answers from different people - 6/15/2003 4:38:41 AM   
dan1220



Posts: 1261
Joined: 4/3/2003
From: Toledo, OH,
Status: offline 		a couple of questions that have been answered differet ways:

1. Can you LEGALLY change tx crystals on 27mhz?

2. Do 2 different brand recievers work together if they are on the same frequency?


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-DAN-
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differnt answers from different people - 6/18/2003 6:52:46 AM   
spadworld



Posts: 161
Joined: 12/19/2002
From: NEAR DFW TEXAS
Status: offline 		I have an AM 27Mhz Radio and to try to answer your question Yes you can. BUT What do you mean by legally??? F.C.C. Legal? Or R/C legal? Either way Yes you can.

On second question. TX's and Recievers can be mix matched to an extent. Mainly they are compatible as long as they are the Same Waveform AM / FM and if they are the Same SHIFT. Positive or negative shift.


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Stuart L.
NTC3 w/ 2 speed

(in reply to dan1220)
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differnt answers from different people - 6/18/2003 7:12:17 AM   
dan1220



Posts: 1261
Joined: 4/3/2003
From: Toledo, OH,
Status: offline 		thats what I thouht about the tx an rx. they have to be the same shift either positive or negative. Now about the crystals. You are 100% sure that its FCC legal to change crystals on 27mhz?


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-DAN-

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differnt answers from different people - 6/18/2003 7:16:02 AM   
dan1220



Posts: 1261
Joined: 4/3/2003
From: Toledo, OH,
Status: offline 		check this out: I think Im going to have to believe this guy!

http://www.rcuniverse.com/forum/tm.asp?m=862902]


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-DAN-

(in reply to dan1220)
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differnt answers from different people - 6/18/2003 8:18:18 AM   
nitroman88-RCU


 

Posts: 2148
Joined: 1/18/2003
From: Pella, IA, USA
Status: offline 		yea I have heard some poeple say that 27mhz AM is legal and others say its illegal. I know for sure that 72 and 75 are illegal

(in reply to dan1220)
       Post #: 5

Depends on what you are doing. - 6/21/2003 11:37:35 PM   
dbow



Posts: 1225
Joined: 7/27/2002
From: Atlanta, GA, USA
Status: offline 		If you are flying planes, most clubs that are AMA (most are) have rules saying you cannot change the transmitter frequency. You can change the rcvr crystal but not the transmitter. The transmitter must be sent out to an authorized service center to have it changed...According to the rules.

I have seen people do it, but if you have an accident and are found to have changed the crystal in the transmitter there might be problems.
All that being in general to air frequencies and flying model ariplanes.


As for land frequencies I see it done all the time at the track, just about everybody changes crystals in the rcvr and transmitter while racing. Its a known to have extra crystal sets when you come out to race. I have never heard of any rule with ROAR althoug it may exist with them or another agency. I just know everyone changes including myself.


As for 27MHZ in particular I have seen em change them on the track too. Less frequencies in that band I think but they change those in and out just as much if not more.

Dbow

(in reply to dan1220)
       Post #: 6

differnt answers from different people - 7/29/2003 9:44:44 AM   
larryflew


 

Posts: 243
Joined: 1/19/2002
From: Young America, MN, USA
Status: offline 		27 AM are all the same no matter which brand. Changing, done all the time. Have full set of 27 AM crystals from way back as well as many 75AM. Legal is another question and basically the answer is NO.

(in reply to dan1220)
       Post #: 7

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