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Old 09-27-2006, 02:47 PM
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tsperry88
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Default JR 6102 Questions

I am looking at buying a JR 6102 TX on ebay. I have a couple of questions. Can you explain these posts to me. What do the different modes mean, and how do I know what mode the TX's I am looking at are.

"I just bought a 6102 on E Bay. I need to convert it to mode 1. Can I change the stick config software in the system menu or do I need to send it to Horizon?"


What does this mean changing chanels. I thought changing the crystals changed the channel. If I go to fly and find somebody else on my frequency, what do I do. Why does it have to be sent in. Please educate me.

"I bought a JR 6102 on RCU but want to change the frequency to my current channel 19. How can that be done? Or would it be cheaper to change my receiver crystals?"


I'm trying to figure this out, so I don't buy the wrong thing.
Old 09-27-2006, 02:56 PM
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Default RE: JR 6102 Questions


ORIGINAL: tsperry88

"I just bought a 6102 on E Bay. I need to convert it to mode 1. Can I change the stick config software in the system menu or do I need to send it to Horizon?"
No, as far as I know you can't change the mode of the radio through software settings. Most radios need to be sent back in to have these changes made.

"I bought a JR 6102 on RCU but want to change the frequency to my current channel 19. How can that be done? Or would it be cheaper to change my receiver crystals?"
Unless the transmitter has a synthisized frequency module on the back of it you can't change the channel of the transmitter. If it uses crystals to control it's channel it is illegal the change the channel yourself. This must be done at an authorized service center. You can change the receivers yourself with no problems, you just can't change the transmitter.

Hope this helps

Ken
Old 09-27-2006, 03:19 PM
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Missileman
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Default RE: JR 6102 Questions

NM I will start another thread
Old 09-27-2006, 03:28 PM
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RCKen
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Default RE: JR 6102 Questions

Missleman,
I understand that you may have been told by others that it's ok to change the crystals in the transmitters, but trust me it is illegal. This is a lot to wade through, but here is all of the text of the FCC reg that covers this. As well as info from Futaba that covers it as well.

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.

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]

[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]

[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]
Old 09-27-2006, 03:31 PM
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Default RE: JR 6102 Questions

If it has a "frequency module", the entire module can be changed but not JUST the crystal in the U.S.
Old 09-27-2006, 04:46 PM
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skiman762
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Default RE: JR 6102 Questions

(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.


Does this mean JR tx are in violation of federal law since the crystal is right there on the back accessible to the user?
where are Futaba crystals located ?


Old 09-27-2006, 04:54 PM
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RCKen
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Default RE: JR 6102 Questions

If it has a crystal it's illegal to change them yourself. And yes, I know that Futaba and other manufacturers have the crystals easily accessible by the end user. Why?? Remember that these radios are sold all over the world, and it's only illegal to change them here in the US. They're not going to redo the case just for US sales.

If a radio has a frequency module then that can be changed by the end user.

Ken
Old 09-27-2006, 05:00 PM
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skiman762
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Default RE: JR 6102 Questions

I knew the answer Ken it's just funny the manufactuer can import radios that violate FFC laws
Old 09-27-2006, 05:01 PM
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Default RE: JR 6102 Questions


ORIGINAL: skiman762

(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.


Does this mean JR tx are in violation of federal law since the crystal is right there on the back accessible to the user?
where are Futaba crystals located ?


The transmitters are FCC acceptance certified which means the FCC has forgiven or accepted these deviations from the rules.

BTW, I happen to have the correct license and equipment to work on these radios but I don't have access to the schematics or tuning procedures which the manufacturers guard closely. Back in the 70's I got a copy of schematics for a radio I had and was able to work on it but that was the last one.
Old 09-27-2006, 05:07 PM
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Default RE: JR 6102 Questions

So with your equipment and license if you change a crystal and it is transmitting on freq without needing adustment your ok ?
Old 09-27-2006, 05:29 PM
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Default RE: JR 6102 Questions

Yes, you can switch mode 1 to mode 2 throug programming in the 6102
Old 09-27-2006, 05:35 PM
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Default RE: JR 6102 Questions


ORIGINAL: cjposada

Yes, you can switch mode 1 to mode 2 throug programming in the 6102
Thanks for providing that information. I wasn't sure if you could or not.

Ken
Old 09-27-2006, 10:39 PM
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Default RE: JR 6102 Questions

Yes you can!
Old 09-28-2006, 07:27 AM
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Default RE: JR 6102 Questions


ORIGINAL: skiman762

So with your equipment and license if you change a crystal and it is transmitting on freq without needing adustment your ok ?
I would technically also require a manual or specifications on the equipment to tell me that I have tested it properly. THEN I would be OK. The point is that you can't just jump into a transmitter and start making adjustments/changes without sufficient knowledge and equipment. You MIGHT get lucky and you might not. Are you willing to bet your plane and those of your friends on it?

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