Radio/Reciever Question
03-29-2007, 01:32 PM
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Radio/Reciever Question
I have a Nexstar package with the standard reveiver, it is on channel 44. I purchased a CUB off ebay and it came with an older Fubtaba radio FPT6NFK, it has does have dual rates it is on Channel 22. A member at the club suggested I purchase a 22 crystal so I can use the radio in the nexstar. He thought it would help smooth out some of my turns and handeling issues.
Question: Can I just by a new crystal or do I need a new receiver because, the 22 is low band and the 44 is high band? What reveiver would you recommend?
Thanks in advance for your help
Question: Can I just by a new crystal or do I need a new receiver because, the 22 is low band and the 44 is high band? What reveiver would you recommend?
Thanks in advance for your help
03-29-2007, 01:40 PM
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RE: Radio/Reciever Question
It says PAR2S on the reciever, the nexstar receiver has built into it the Flight stablization Blah Blah stuff. My thought is if I need to but a new receiver I'll just bit the bullet and by a new radio with receiver
03-29-2007, 01:41 PM
#4
RE: Radio/Reciever Question
If it's a bit of an older receiver then Missleman is right on the money. You are going to be dealing with a low band/high band issue. Changing the receiver from 44 to 22 will more than likely cause issues that could cost you a plane.
FYI, just in case. You can't change the channel of the transmitter yourself. It's illegal for end users in the United States to change the crystals on the transmitters themselves. For this to be done the radio needs to be sent in to an authorized service center.
Hope this helps
Ken
FYI, just in case. You can't change the channel of the transmitter yourself. It's illegal for end users in the United States to change the crystals on the transmitters themselves. For this to be done the radio needs to be sent in to an authorized service center.
Hope this helps
Ken
03-29-2007, 01:41 PM
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RE: Radio/Reciever Question
As long as the TX is compatible with the Receiver I don't see why you couldn't just simply change the frequency of the receiver to 22. Isn't it the crystal and not the receiver that determines the high or low frequency?
03-29-2007, 01:51 PM
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RE: Radio/Reciever Question
ORIGINAL: RCKen
FYI, just in case. You can't change the channel of the transmitter yourself. It's illegal for end users in the United States to change the crystals on the transmitters themselves. For this to be done the radio needs to be sent in to an authorized service center.
FYI, just in case. You can't change the channel of the transmitter yourself. It's illegal for end users in the United States to change the crystals on the transmitters themselves. For this to be done the radio needs to be sent in to an authorized service center.
Just wondering
Thanks
03-29-2007, 01:55 PM
#7
RE: Radio/Reciever Question
ORIGINAL: tigerdude426
As long as the TX is compatible with the Receiver I don't see why you couldn't just simply change the frequency of the receiver to 22. Isn't it the crystal and not the receiver that determines the high or low frequency?
As long as the TX is compatible with the Receiver I don't see why you couldn't just simply change the frequency of the receiver to 22. Isn't it the crystal and not the receiver that determines the high or low frequency?
Ken
03-29-2007, 02:02 PM
#8
RE: Radio/Reciever Question
ORIGINAL: jmurphy18
Can I ask how long this has been in effect? the reason I ask is I use to race RC cars and we would have to change the crystals if there was more than 1 person on the freq. I remember having 4-5 choice for the Rx & Tx. I had both the HiTech with the systhizer module and the Futaba 3PK with crystals.
Just wondering
Thanks
ORIGINAL: RCKen
FYI, just in case. You can't change the channel of the transmitter yourself. It's illegal for end users in the United States to change the crystals on the transmitters themselves. For this to be done the radio needs to be sent in to an authorized service center.
FYI, just in case. You can't change the channel of the transmitter yourself. It's illegal for end users in the United States to change the crystals on the transmitters themselves. For this to be done the radio needs to be sent in to an authorized service center.
Just wondering
Thanks
If you are interested in the full text of the regulations concerning this matter they can be found at:
[link=http://www.access.gpo.gov/nara/cfr/waisidx_04/47cfr95_04.html]FCC Title 47, Part 95 - Personal Radio Services[/link]
Copied from Futaba's website
How do I change the frequency of my transmitter?
For a unit with crystals: We CANNOT recommend changing crystals to a different frequency. Changing the crystal on your transmitter is illegal unless you have the proper license. The FCC has established guidelines for the modeler's safety and for the safety of spectators. For safety and FCC reasons we must request that both TX and RX be sent to the service center to ensure proper crystal change and retuning to the new frequency. Crystal based radios cannot be converted to another band without parts replacement, and may not be able to be converted at all. Certain radios can be converted, for example, from 72 to 75MHz. Please contact the service center for any other conversions.
The applicable Federal Regulation is as follows:
TITLE 47—TELECOMMUNICATION COMMISSION (CONTINUED)
PART 95—PERSONAL RADIO SERVICES
Subpart E—Technical Regulations
Sec. 95.645 Control accessibility.
(a) No control, switch or other type of adjustment which, when
manipulated, can result in a violation of the rules shall be accessible
from the transmitter operating panel or from exterior of the transmitter
enclosure.
(b) An R/C transmitter which incorporates plug-in frequency
determining modules which are changed by the user must be certificated
with the modules. Each module must contain all of the frequency
determining circuitry including the oscillator. Plug-in crystals are not
considered modules and must not be accessible to the user.
For a unit with crystals: We CANNOT recommend changing crystals to a different frequency. Changing the crystal on your transmitter is illegal unless you have the proper license. The FCC has established guidelines for the modeler's safety and for the safety of spectators. For safety and FCC reasons we must request that both TX and RX be sent to the service center to ensure proper crystal change and retuning to the new frequency. Crystal based radios cannot be converted to another band without parts replacement, and may not be able to be converted at all. Certain radios can be converted, for example, from 72 to 75MHz. Please contact the service center for any other conversions.
The applicable Federal Regulation is as follows:
TITLE 47—TELECOMMUNICATION COMMISSION (CONTINUED)
PART 95—PERSONAL RADIO SERVICES
Subpart E—Technical Regulations
Sec. 95.645 Control accessibility.
(a) No control, switch or other type of adjustment which, when
manipulated, can result in a violation of the rules shall be accessible
from the transmitter operating panel or from exterior of the transmitter
enclosure.
(b) An R/C transmitter which incorporates plug-in frequency
determining modules which are changed by the user must be certificated
with the modules. Each module must contain all of the frequency
determining circuitry including the oscillator. Plug-in crystals are not
considered modules and must not be accessible to the user.
Copied from FCC regulations concerning this issue
[Code of Federal Regulations]
[Title 47, Volume 5]
[Revised as of October 1, 2004]
From the U.S. Government Printing Office via GPO Access
[CITE: 47CFR95.221]
[Page 539]
TITLE 47--TELECOMMUNICATION CHAPTER I--FEDERAL COMMUNICATIONS COMMISSION (CONTINUED)
PART 95_PERSONAL RADIO SERVICES--Table of Contents
Subpart C_Radio Control (R/C) Radio Service
Sec. 95.221 (R/C Rule 21) How do I have my R/C transmitter serviced?
(a) You may adjust an antenna to your R/C transmitter and you may make radio checks. (A radio check means a one-way transmission for a short time in order to test the transmitter.)
(b) You are responsible for the proper operation of the station at all times and are expected to provide for observations, servicing and maintenance as often as may be necessary to ensure proper operation. Each internal repair and each internal adjustment to an FCC certificated R/C transmitter (see R/C Rule 9) must be made in accord with the Technical Regulations (see subpart E). The internal repairs or internal adjustments should be performed by or under the immediate supervision and responsibility of a person certified as technically qualified to perform transmitter maintenance and repair duties in the private land mobile services and fixed services by an organization or committee representative of users in those services.
(c) Except as provided in paragraph
(d) of this section, each internal repair and each internal adjustment of an R/C transmitter in which signals are transmitted must be made using a nonradiating (``dummy'') antenna. (d) Brief test signals (signals not longer than one minute during any five minute period) using a radiating antenna may be transmitted in order to:
(1) Adjust a transmitter to an antenna;
(2) Detect or measure radiation of energy other than the intended signal; or
(3) Tune a receiver to your R/C transmitter.
(Secs. 4(i) and 303(r), Communications Act of 1934, as amended, 47 U.S.C. 154(i) and 303(r), and sec. 553 of the Administrative Procedures Act, 5 U.S.C. 553) [48 FR 24890, June 3, 1983, as amended at 49 FR 20673, May 16, 1984; 63 FR 36610, July 7, 1998]
[Title 47, Volume 5]
[Revised as of October 1, 2004]
From the U.S. Government Printing Office via GPO Access
[CITE: 47CFR95.221]
[Page 539]
TITLE 47--TELECOMMUNICATION CHAPTER I--FEDERAL COMMUNICATIONS COMMISSION (CONTINUED)
PART 95_PERSONAL RADIO SERVICES--Table of Contents
Subpart C_Radio Control (R/C) Radio Service
Sec. 95.221 (R/C Rule 21) How do I have my R/C transmitter serviced?
(a) You may adjust an antenna to your R/C transmitter and you may make radio checks. (A radio check means a one-way transmission for a short time in order to test the transmitter.)
(b) You are responsible for the proper operation of the station at all times and are expected to provide for observations, servicing and maintenance as often as may be necessary to ensure proper operation. Each internal repair and each internal adjustment to an FCC certificated R/C transmitter (see R/C Rule 9) must be made in accord with the Technical Regulations (see subpart E). The internal repairs or internal adjustments should be performed by or under the immediate supervision and responsibility of a person certified as technically qualified to perform transmitter maintenance and repair duties in the private land mobile services and fixed services by an organization or committee representative of users in those services.
(c) Except as provided in paragraph
(d) of this section, each internal repair and each internal adjustment of an R/C transmitter in which signals are transmitted must be made using a nonradiating (``dummy'') antenna. (d) Brief test signals (signals not longer than one minute during any five minute period) using a radiating antenna may be transmitted in order to:
(1) Adjust a transmitter to an antenna;
(2) Detect or measure radiation of energy other than the intended signal; or
(3) Tune a receiver to your R/C transmitter.
(Secs. 4(i) and 303(r), Communications Act of 1934, as amended, 47 U.S.C. 154(i) and 303(r), and sec. 553 of the Administrative Procedures Act, 5 U.S.C. 553) [48 FR 24890, June 3, 1983, as amended at 49 FR 20673, May 16, 1984; 63 FR 36610, July 7, 1998]
[Code of Federal Regulations]
[Title 47, Volume 5]
[Revised as of October 1, 2004]
From the U.S. Government Printing Office via GPO Access
[CITE: 47CFR95.222]
[Page 539-540]
TITLE 47--TELECOMMUNICATION
CHAPTER I--FEDERAL COMMUNICATIONS
COMMISSION (CONTINUED)
PART 95_PERSONAL RADIO SERVICES--Table of Contents
Subpart C_Radio Control (R/C) Radio Service
Sec. 95.222 (R/C Rule 22) May I make any changes to my R/C station transmitter?
(a) You must not make or have anyone else make an internal modification to your R/C transmitter.
(b) Internal modification does not include:
(1) Repair or servicing of an R/C station transmitter (see R/C Rule 21, Sec. 95.221); or
(2) Changing plug-in modules which were certificated as part of your R/C transmitter.
(c) You must not operate an R/C transmitter which has been modified by anyone in any way, including modification to operate on unauthorized frequencies or with illegal power. (See R/C Rules 9 and 10, Sec. Sec. 95.209 and 95.210.)
[48 FR 24894, June 3, 1983, as amended at 63 FR 36610, July 7, 1998]
[Title 47, Volume 5]
[Revised as of October 1, 2004]
From the U.S. Government Printing Office via GPO Access
[CITE: 47CFR95.222]
[Page 539-540]
TITLE 47--TELECOMMUNICATION
CHAPTER I--FEDERAL COMMUNICATIONS
COMMISSION (CONTINUED)
PART 95_PERSONAL RADIO SERVICES--Table of Contents
Subpart C_Radio Control (R/C) Radio Service
Sec. 95.222 (R/C Rule 22) May I make any changes to my R/C station transmitter?
(a) You must not make or have anyone else make an internal modification to your R/C transmitter.
(b) Internal modification does not include:
(1) Repair or servicing of an R/C station transmitter (see R/C Rule 21, Sec. 95.221); or
(2) Changing plug-in modules which were certificated as part of your R/C transmitter.
(c) You must not operate an R/C transmitter which has been modified by anyone in any way, including modification to operate on unauthorized frequencies or with illegal power. (See R/C Rules 9 and 10, Sec. Sec. 95.209 and 95.210.)
[48 FR 24894, June 3, 1983, as amended at 63 FR 36610, July 7, 1998]
[Code of Federal Regulations]
[Title 47, Volume 5]
[Revised as of October 1, 2004]
From the U.S. Government Printing Office via GPO Access
[CITE: 47CFR95.645]
[Page 561]
TITLE 47--TELECOMMUNICATION
CHAPTER I--FEDERAL COMMUNICATIONS
COMMISSION (CONTINUED)
PART 95_PERSONAL RADIO SERVICES--Table of Contents
Subpart E_Technical Regulations
Sec. 95.645 Control accessibility.
(a) No control, switch or other type of adjustment which, when manipulated, can result in a violation of the rules shall be accessible
from the transmitter operating panel or from exterior of the transmitter enclosure.
(b) An R/C transmitter which incorporates plug-in frequency determining modules which are changed by the user must be certificated
with the modules. Each module must contain all of the frequency determining circuitry including the oscillator. Plug-in crystals are not
considered modules and must not be accessible to the user.
[53 FR 36789, Sept. 22, 1988. Redesignated at 61 FR 28769, June 6, 1996, and further redesignated at 61 FR 46567, Sept. 4, 1996; 63 FR 36610, July 7, 1998]
[Title 47, Volume 5]
[Revised as of October 1, 2004]
From the U.S. Government Printing Office via GPO Access
[CITE: 47CFR95.645]
[Page 561]
TITLE 47--TELECOMMUNICATION
CHAPTER I--FEDERAL COMMUNICATIONS
COMMISSION (CONTINUED)
PART 95_PERSONAL RADIO SERVICES--Table of Contents
Subpart E_Technical Regulations
Sec. 95.645 Control accessibility.
(a) No control, switch or other type of adjustment which, when manipulated, can result in a violation of the rules shall be accessible
from the transmitter operating panel or from exterior of the transmitter enclosure.
(b) An R/C transmitter which incorporates plug-in frequency determining modules which are changed by the user must be certificated
with the modules. Each module must contain all of the frequency determining circuitry including the oscillator. Plug-in crystals are not
considered modules and must not be accessible to the user.
[53 FR 36789, Sept. 22, 1988. Redesignated at 61 FR 28769, June 6, 1996, and further redesignated at 61 FR 46567, Sept. 4, 1996; 63 FR 36610, July 7, 1998]
03-29-2007, 02:02 PM
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RE: Radio/Reciever Question
Okay, so the way I read it RC KEN says might be an issue Tigerdude says not an issue. So can I assume if before I buy the crsytal I yank the 22 crystal out of my cubs reciever and plug it into the Nexstar receiver and I do a range check everything looks good I'm okay?
03-29-2007, 02:08 PM
#10
RE: Radio/Reciever Question
ORIGINAL: baja_236
Okay, so the way I read it RC KEN says might be an issue Tigerdude says not an issue. So can I assume if before I buy the crsytal I yank the 22 crystal out of my cubs reciever and plug it into the Nexstar receiver and I do a range check everything looks good I'm okay?
Okay, so the way I read it RC KEN says might be an issue Tigerdude says not an issue. So can I assume if before I buy the crsytal I yank the 22 crystal out of my cubs reciever and plug it into the Nexstar receiver and I do a range check everything looks good I'm okay?
Ken
03-29-2007, 02:17 PM
#13
RE: Radio/Reciever Question
This is the RX in question
http://www2.towerhobbies.com/cgi-bin...&I=LXGFR5&P=FR
As you can read, it IS hi/low sensitive and to cross over without a retuning will cost some RX sensitivity (range) issues though they may/may not be great.
Ken has quoted the FCC rules properly and this is also the advice given by BAX who is the American spokesperson for Futaba.
http://www2.towerhobbies.com/cgi-bin...&I=LXGFR5&P=FR
As you can read, it IS hi/low sensitive and to cross over without a retuning will cost some RX sensitivity (range) issues though they may/may not be great.
Ken has quoted the FCC rules properly and this is also the advice given by BAX who is the American spokesperson for Futaba.
03-29-2007, 02:46 PM
#15
RE: Radio/Reciever Question
ORIGINAL: RCKen
No, this is not the case. Especially on older Futaba equipment. The receivers are tuned to perform better on either the low channels (low band) or the higher channels (high band). The newer receivers are tuned more towards the center and can go either direction. But on older receivers you need to observe this. The crystals have nothing to do with this, they are just a crystal.
Ken
ORIGINAL: tigerdude426
As long as the TX is compatible with the Receiver I don't see why you couldn't just simply change the frequency of the receiver to 22. Isn't it the crystal and not the receiver that determines the high or low frequency?
As long as the TX is compatible with the Receiver I don't see why you couldn't just simply change the frequency of the receiver to 22. Isn't it the crystal and not the receiver that determines the high or low frequency?
Ken
04-15-2007, 11:11 AM
#16
My Feedback: (106)
RE: Radio/Reciever Question
OK you guys. Let's look at something else here. Anytime you are looking at electronics any change needs to be by the book. Ham radio taught me that years ago. especially if its a TX that propagates a radio wave. However, Looking at Futaba's FP-R147DP and FP-R148DP Rec. The only thing I can see diff between high band and low band is about two inches of Ant. and in fact, looks fare on the service mon. I have not looked at the older Futaba Rec. and can't comment on them. By the same token, we can't have just anyone sticking a screwdriver in there radio's and bringing them out to the field. What do you all think of this??? Hooker53
04-15-2007, 12:05 PM
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RE: Radio/Reciever Question
Murphy, I was a track director for many years at different tracks in NJ. It is Totally illegal to change TX frquencies. but when it is standard practice and accepted by the national racing organizations it ends up trickling down to the local tracks. it is not the
race directors nor the tracks responsibility to enforce FCC rules. it is the responsibility of the modeler to comply with
the rules governing the use of his or her equipment.
Ken I understand that this is illegal practice as per the FCC, but before synthesized TX and RX, and DSM a crystal swap
was the only way to get 2 racers into the main event when they both had the same channel. Understand please that I don't
condone this type of activity nor did we sell crystals in our shop, but when a racer came up and said I changed to 68 from
62 we updated the CPU and raced.
At the field there would be no reason for this. Wait for your frequency to open, and purchase the proper equipment to comply
with FCC rules.
race directors nor the tracks responsibility to enforce FCC rules. it is the responsibility of the modeler to comply with
the rules governing the use of his or her equipment.
Ken I understand that this is illegal practice as per the FCC, but before synthesized TX and RX, and DSM a crystal swap
was the only way to get 2 racers into the main event when they both had the same channel. Understand please that I don't
condone this type of activity nor did we sell crystals in our shop, but when a racer came up and said I changed to 68 from
62 we updated the CPU and raced.
At the field there would be no reason for this. Wait for your frequency to open, and purchase the proper equipment to comply
with FCC rules.
04-15-2007, 12:42 PM
#18
RE: Radio/Reciever Question
It also doesn't physically matter quite as much with a surface vehicle. Very few cars dive into the ground from 200 feet up.
Still not legal and gets one into bad habits. Range is also seldom an issue on a track.
If you want to change channels, find a way to do it legally and SAFELY.
Still not legal and gets one into bad habits. Range is also seldom an issue on a track.If you want to change channels, find a way to do it legally and SAFELY.
