Transmitter and receiver questions.
04-23-2007 | 11:18 PM
#1
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From: Milaca,
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Transmitter and receiver questions.
OK I am a newbie at this so bear with me.
I bought two Futaba FP-T7UAF radios. One is on ch 25 and the other is on ch 19. I then got two Futaba receivers with ch 50 in them.
The method to my madness was to get a channel 50 module for the two transmitters ad use them in a trainer configuration.
Can the modules just be swapped out and work with the receivers?
#2 scenerario....Could I put either ch25 or 19 in the receivers and then get either a ch 25 or 19 module for one of the transmitters to make a pair and work ok? Is there a problem with moving frequency of the receivers?
After I get this sorted out and clear in my head I will know what to look for here.
I bought two Futaba FP-T7UAF radios. One is on ch 25 and the other is on ch 19. I then got two Futaba receivers with ch 50 in them.
The method to my madness was to get a channel 50 module for the two transmitters ad use them in a trainer configuration.
Can the modules just be swapped out and work with the receivers?
#2 scenerario....Could I put either ch25 or 19 in the receivers and then get either a ch 25 or 19 module for one of the transmitters to make a pair and work ok? Is there a problem with moving frequency of the receivers?
After I get this sorted out and clear in my head I will know what to look for here.
04-23-2007 | 11:59 PM
#2
RE: Transmitter and receiver questions.
Receiver frequencies are easy to change, but it depends on the model of the receiver. Transmitter frequencies are not user changable except on "synthesized" radio systems where freq is easily selectable. To change the transmitter crystal frequency, your radio should be sent back in for factory retuning.
With regard to receiver crystals, you can change them out easily enough as long as you know whether you need a single (short crystal) or dual conversion crystal to match the receiver. The additional issue with Futaba receivers is some models are made in high/low band versions. A Futaba receiver that is a "low band model" can be tuned to any frequency from 11 to 35 simply by inserting the appropriate crystal of the frequency desired. A "high band" model Futaba receiver can take any crystal from channel 36 to 60.
Not all Futaba receivers are seperated into low band or high band models. You will need to know more about the models of receiver that you own before you can safely change their frequency. If you change a low-band receiver to a high-band frequency (or high to low), the useful range of the receiver could be significantly reduced. Interference and/or loss of radio control could occur under otherwise normal flying conditions.
Please feel free to ask questions, you don't want to be flying a range-impaired RC plane!
With regard to receiver crystals, you can change them out easily enough as long as you know whether you need a single (short crystal) or dual conversion crystal to match the receiver. The additional issue with Futaba receivers is some models are made in high/low band versions. A Futaba receiver that is a "low band model" can be tuned to any frequency from 11 to 35 simply by inserting the appropriate crystal of the frequency desired. A "high band" model Futaba receiver can take any crystal from channel 36 to 60.
Not all Futaba receivers are seperated into low band or high band models. You will need to know more about the models of receiver that you own before you can safely change their frequency. If you change a low-band receiver to a high-band frequency (or high to low), the useful range of the receiver could be significantly reduced. Interference and/or loss of radio control could occur under otherwise normal flying conditions.
Please feel free to ask questions, you don't want to be flying a range-impaired RC plane!
04-24-2007 | 12:44 AM
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From: Milaca,
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RE: Transmitter and receiver questions.
ORIGINAL: bigedmustafa
Receiver frequencies are easy to change, but it depends on the model of the receiver. Transmitter frequencies are not user changable except on "synthesized" radio systems where freq is easily selectable. To change the transmitter crystal frequency, your radio should be sent back in for factory retuning.
With regard to receiver crystals, you can change them out easily enough as long as you know whether you need a single (short crystal) or dual conversion crystal to match the receiver. The additional issue with Futaba receivers is some models are made in high/low band versions. A Futaba receiver that is a "low band model" can be tuned to any frequency from 11 to 35 simply by inserting the appropriate crystal of the frequency desired. A "high band" model Futaba receiver can take any crystal from channel 36 to 60.
Not all Futaba receivers are seperated into low band or high band models. You will need to know more about the models of receiver that you own before you can safely change their frequency. If you change a low-band receiver to a high-band frequency (or high to low), the useful range of the receiver could be significantly reduced. Interference and/or loss of radio control could occur under otherwise normal flying conditions.
Please feel free to ask questions, you don't want to be flying a range-impaired RC plane!
Receiver frequencies are easy to change, but it depends on the model of the receiver. Transmitter frequencies are not user changable except on "synthesized" radio systems where freq is easily selectable. To change the transmitter crystal frequency, your radio should be sent back in for factory retuning.
With regard to receiver crystals, you can change them out easily enough as long as you know whether you need a single (short crystal) or dual conversion crystal to match the receiver. The additional issue with Futaba receivers is some models are made in high/low band versions. A Futaba receiver that is a "low band model" can be tuned to any frequency from 11 to 35 simply by inserting the appropriate crystal of the frequency desired. A "high band" model Futaba receiver can take any crystal from channel 36 to 60.
Not all Futaba receivers are seperated into low band or high band models. You will need to know more about the models of receiver that you own before you can safely change their frequency. If you change a low-band receiver to a high-band frequency (or high to low), the useful range of the receiver could be significantly reduced. Interference and/or loss of radio control could occur under otherwise normal flying conditions.
Please feel free to ask questions, you don't want to be flying a range-impaired RC plane!
First off I thought the idea of the rf module in the Futaba FP-T7UAF was to be able to change frequencies without tuning the transmitter. Was I told wrong about this???
Secondly I should have mentioned that The receivers I got are Futaba FP-R127D's "dual conversion" .
04-24-2007 | 02:33 AM
#4
RE: Transmitter and receiver questions.
You are probably not wrong about the FP-T7UAF. I was speaking in general terms, since I'm not familiar with most of Futaba's older products. I just got into the sport a couple of seasons ago, myself.
Your FP-T7UAF radios aren't even listed on Futaba's website under "discontinued systems."
The FP-R127D receivers that you have are made in a high-band and low-band version. It sounds like you bought a pair of high-band receivers, so you don't want to put any crystals in them that are below Channel 36. I believe it's possible to have the receivers retuned if you send them in to Hobby Services, but it's probably not worth the expense.
I did manage to find the owners' manual for your radios here:
http://manuals.hobbico.com/fut/7uaf-7uap-manual.pdf
"The crystal can be changed from the outside of the receiver case. Always use the Futaba transmitter/receiver matched crystal set to change the band."
Reading through the manual, I can't find any detailed information about the RF module or directions for changing TX frequencies other than the blurb above about using a "matched crystal set."
Your FP-T7UAF radios aren't even listed on Futaba's website under "discontinued systems."
The FP-R127D receivers that you have are made in a high-band and low-band version. It sounds like you bought a pair of high-band receivers, so you don't want to put any crystals in them that are below Channel 36. I believe it's possible to have the receivers retuned if you send them in to Hobby Services, but it's probably not worth the expense.
I did manage to find the owners' manual for your radios here:
http://manuals.hobbico.com/fut/7uaf-7uap-manual.pdf
"The crystal can be changed from the outside of the receiver case. Always use the Futaba transmitter/receiver matched crystal set to change the band."
Reading through the manual, I can't find any detailed information about the RF module or directions for changing TX frequencies other than the blurb above about using a "matched crystal set."
04-24-2007 | 06:51 AM
#5
My Feedback: (12)
RE: Transmitter and receiver questions.
Frequency modules can be changed by the end user because they are tuned to the specific frequency by the factory. It is also possible to have them changed to a different frequency by a service center. Retuning is less money than buying a new one.
Since these are older radios, my suggestion is to box them up and send them in for service. If you want them to be changed to channel 50 while they are there, the cost would be low. I sent two transmitters and a receiver to [link=http://www.radiosouthrc.com/]Radio South[/link] this winter to have them checked and retuned. The total, including return shipping, was a little over $60.
If the receivers are not new, I'd send them in too. In addition to checking, and adjusting, how well they are receiving, they can do a vibration test to insure they are ok.
Since these are older radios, my suggestion is to box them up and send them in for service. If you want them to be changed to channel 50 while they are there, the cost would be low. I sent two transmitters and a receiver to [link=http://www.radiosouthrc.com/]Radio South[/link] this winter to have them checked and retuned. The total, including return shipping, was a little over $60.
If the receivers are not new, I'd send them in too. In addition to checking, and adjusting, how well they are receiving, they can do a vibration test to insure they are ok.
04-24-2007 | 07:36 AM
#6
Senior Member
RE: Transmitter and receiver questions.
I like piper chuck's recommendation. The 7UAF is at least 15 years old, and probably would benefit from a checkup. It's a good radio and will serve you well. The entire plug-in RF module can be swapped out by the user. The RX crystal can be swapped out by the user, also. Any interior work on either TX or RX or crystal swapping on the TX will necessitate a trip to the shop as suggested by chuck.
Send'em off.
Dr.1
Send'em off.
Dr.1
04-24-2007 | 08:50 AM
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From: Milaca,
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RE: Transmitter and receiver questions.
ORIGINAL: mnfly
OK I am a newbie at this so bear with me.
I bought two Futaba FP-T7UAF radios. One is on ch 25 and the other is on ch 19. I then got two Futaba receivers with ch 50 in them.
The method to my madness was to get a channel 50 module for the two transmitters ad use them in a trainer configuration.
Can the modules just be swapped out and work with the receivers?
#2 scenerario....Could I put either ch25 or 19 in the receivers and then get either a ch 25 or 19 module for one of the transmitters to make a pair and work ok? Is there a problem with moving frequency of the receivers?
After I get this sorted out and clear in my head I will know what to look for here.
OK I am a newbie at this so bear with me.
I bought two Futaba FP-T7UAF radios. One is on ch 25 and the other is on ch 19. I then got two Futaba receivers with ch 50 in them.
The method to my madness was to get a channel 50 module for the two transmitters ad use them in a trainer configuration.
Can the modules just be swapped out and work with the receivers?
#2 scenerario....Could I put either ch25 or 19 in the receivers and then get either a ch 25 or 19 module for one of the transmitters to make a pair and work ok? Is there a problem with moving frequency of the receivers?
After I get this sorted out and clear in my head I will know what to look for here.
