Switch Frequency Crystal on Transmitter?  
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All Forums >> RC Airplanes >> Beginners >> Switch Frequency Crystal on Transmitter?
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Switch Frequency Crystal on Transmitter? - 6/6/2006 6:01:11 PM   
zliu


 

Posts: 10
Joined: 5/15/2006
From: Plantation, FL, USA
Status: offline 		Hi:

I bought a used Radio Futaba Conquest 4NBF 4 Channel radio 72Mhz, a Futaba buddy box and a trainer cord, for the purpose of training. BTW, channel is 26, without servo and receiver.

My friend has a 72 Mhz 4 channel trainner plane without buddy box and trainer cord at channel 51.

Can I plug in his crystal of channel 51 into my transimitter in order to use my transimitter and the buddy box? I believe his plane receiver can receive from my transimitter since they are same brand crystal with same set frequency.

Could anyone please advise?

Thanks!
       Post #: 1

RE: Switch Frequency Crystal on Transmitter? - 6/6/2006 6:35:13 PM   
Ken Erickson



Posts: 308
Joined: 12/17/2005
From: Columbus, IN, USA
Status: offline 		zliu,

I'm not going to tell you all the reasons not to do that. There are many. Others may.

The best solution is to put a channel 26 receiver in your friend's plane.

His receiver can receive from your transmitter, given matching crystals. All other manufacturers tune the receivers to the middle of the band, channel 35 or 36. Futaba, in the belif that you will have better reception, tunes some to channel 47 (middle of the high half of the band) and channel 23 (middle of the low half of the band), If you plug a channel 26 crystal into a Futaba High Band receiver, you will have about ther same degree of tuning as if you plugged another brand's channel 60 or 11 crystal into that same brand's receiver.

Don't change the transmitter crystal. Changing the receiver crystal is a better idea.

Ken, AMA 19352


(in reply to zliu)
       Post #: 2

RE: Switch Frequency Crystal on Transmitter? - 6/6/2006 6:36:52 PM   
JohnW



Posts: 1770
Joined: 3/22/2002
From: Lincoln, NE, USA
Status: offline 		No, violates FCC regs. The user cannot change TX freq in the US on the 72MHz band. HOWEVER, you can probably put a CH26 RX XTAL in his receiver without a problem assuming his RX is compatible with your TX. That way you can use your TX and BB on CH26 with his plane. I'm assuming you are asking this becasue there is a compaitbility issue hooking your BB up to his TX? You didn't mention the make/model of your buddies radio. Anyway, whenever you change RX or XTAls in a RX, always be sure to range check.

Edit... Mr. Foamie beat me to it by 90 seconds... ditto... what he said.

< Message edited by JohnW -- 6/6/2006 6:38:54 PM >

(in reply to zliu)
       Post #: 3

RE: Switch Frequency Crystal on Transmitter? - 6/6/2006 8:29:08 PM   
zliu


 

Posts: 10
Joined: 5/15/2006
From: Plantation, FL, USA
Status: offline 		Thank you Guys!

Both your advice help me decide.
I think I am going just change the receiver crystal to 26 on his plane.

Then I can use my TX and my buddy box to be trained on his plane.

(in reply to JohnW)
       Post #: 4

RE: Switch Frequency Crystal on Transmitter? - 6/6/2006 11:41:06 PM   
carrellh



Posts: 3888
Joined: 3/30/2003
From: Garland, TX, USA
Status: offline 		If your buddy has a Futaba transmitter, why not use it as the master and not have to change anything?

_____________________________

Regards,
Carrell

(in reply to zliu)
       Post #: 5

RE: Switch Frequency Crystal on Transmitter? - 6/7/2006 12:00:36 PM   
Tweek



Posts: 131
Joined: 4/30/2006
From: Youngsville, NC, USA
Status: offline
quote:

ORIGINAL: carrellh
If your buddy has a Futaba transmitter, why not use it as the master and not have to change anything?


This brings up a good point... I wasn't really sure I understood the thread of this message. Are you basically going to be training on your buddies airplane? If so, simply plug in the cord and tx you just bought to his system. He (the trainer) will still fly his plane with the same TX he's using to fly with now, he'll pull the switch to transfer control over to you and your TX when he's ready for you to take control. You don't even have to extend your antenna.

The buddy (trainee) transmitter doesn't use the RF deck of it's radio, only the controls/encoder. I've got an old Futaba gold TX that I use for training, it doesn't have an RF module OR batteries in the back...it just supplies the sticks and encoder when I pull the switch to "give it to the student".

Does that make more sense?



_____________________________

Dave AMA-119484, dave@eastrc.org
http://www.rd-rc.org, http://www.FlyForTots.com, http://www.2Vulcans.net

(in reply to carrellh)
       Post #: 6

RE: Switch Frequency Crystal on Transmitter? - 6/7/2006 2:32:11 PM   
Ken Erickson



Posts: 308
Joined: 12/17/2005
From: Columbus, IN, USA
Status: offline 		zliu,

Please jump back in here and give us info about your buddy's transmitter. I ass-u-me-d that it could not be buddy-boxed. carrellh has the easiest solution to your problem, if that transmitter has a buddy cord jack.

Ken, AMA 19352

(in reply to carrellh)
       Post #: 7

RE: Switch Frequency Crystal on Transmitter? - 6/7/2006 2:44:48 PM   
skiman762



Posts: 1166
Joined: 12/1/2005
From: Nashville, NC, USA
Status: offline 		here the rx info from futaba you can change the crystal in the rx within the upper and lower channels but you have to send the tx to them if it doesn't have a module

How do I change the frequency on my receiver?
Futaba 72MHz receivers are all center tuned within 1/2 or the other 1/2 of the frequency band. So, if you have a receiver on any channel within 11-35 (72.010 through 72.490), you can purchase a receiver crystal and change it to any other channel within 11-35. If you have a receiver on any channel within 36-60 (72.510 through 72.990), you can change the crystal and use it on any other channel within 38-60. However, ALWAYS perform a full range check prior to utilizing the equipment. If you have any doubts about its performance, it is always best to send it for service and let us match your transmitter (if your Tx has a module, only that needs to be sent) and receiver for maximum performance

Futaba 27MHz, 50MHz, and 75MHz are all center tuned to that particular band. Therefore, any 27MHz receiver on any channel can be changed to any other channel WITHIN THE 27MHz band, and same is true of 50 and 75 MHz bands.



_____________________________

land of the FREE: you're free to get a JOB not a handout.
home of the BRAVE: they paid for it and you're enjoying it

(in reply to Ken Erickson)
       Post #: 8

RE: Switch Frequency Crystal on Transmitter? - 6/7/2006 2:47:06 PM   
skiman762



Posts: 1166
Joined: 12/1/2005
From: Nashville, NC, USA
Status: offline
quote:

ORIGINAL: zliu

Thank you Guys!

Both your advice help me decide.
I think I am going just change the receiver crystal to 26 on his plane.

Then I can use my TX and my buddy box to be trained on his plane.


check my last post

_____________________________

land of the FREE: you're free to get a JOB not a handout.
home of the BRAVE: they paid for it and you're enjoying it

(in reply to zliu)
       Post #: 9

RE: Switch Frequency Crystal on Transmitter? - 6/7/2006 7:40:09 PM   
zliu


 

Posts: 10
Joined: 5/15/2006
From: Plantation, FL, USA
Status: offline 		Mr. Foamie/carrell:

His plane's TX doesn't have trainer port, nor buddy box. That's why I way trying to figure out a way use mine.

skiman762:
Very good point, I will keep it in mind!

Thanks for all your input!

(in reply to Ken Erickson)
       Post #: 10

RE: Switch Frequency Crystal on Transmitter? - 6/7/2006 10:24:09 PM   
Tweek



Posts: 131
Joined: 4/30/2006
From: Youngsville, NC, USA
Status: offline
quote:

ORIGINAL: zliu

Mr. Foamie/carrell:

His plane's TX doesn't have trainer port, nor buddy box. That's why I way trying to figure out a way use mine.

skiman762:
Very good point, I will keep it in mind!

Thanks for all your input!



Ahhh... thanks for the clarification. Hope you get your situation worked out and flying!


_____________________________

Dave AMA-119484, dave@eastrc.org
http://www.rd-rc.org, http://www.FlyForTots.com, http://www.2Vulcans.net

(in reply to zliu)
       Post #: 11

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