Crystal ?
11-02-2010 | 03:33 PM
#1
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Crystal ?
Afternoon. I have been switching tx and rx crystals with a few different planes with my 6 channel futaba radio. I have 72.510, 610 and 710. Someone recently said that this isn't a good idea. Is there a problem with doing this?
Thanks,
Thanks,
11-02-2010 | 03:46 PM
#2
RCU Forum Manager/Admin
My Feedback: (9)
RE: Crystal ?
Swapping out the crystal in your receivers is not too big of a deal. However, in Futaba radios you have to pay attention to the bands for the receiver. If you are channel 35 and below you have to have a low band receiver, and for 36 and above you have to have a high band receiver. Futaba is the only one with this limitation.
Now the transmitter is something else entirely. It is illegal in the U.S. for the end user to change the crystal in the transmitter. It must be changed by a facility that is capable of checking, and retuning if necessary, the output of the radio.
<font size="2">
If you are interested in the full text of the regulations concerning this matter they can be found at:</p>
</p>
[link=http://www.access.gpo.gov/nara/cfr/waisidx_04/47cfr95_04.html]FCC Title 47, Part 95 - Personal Radio Services[/link]</p>
</p>
Copied from Futaba's website</p>
</p>
</p>
</p>
Copied from FCC regulations concerning this issue</p>
</p>
</p>
</p>
</p>
</p>
</p>
</p>
</p></font>
Now the transmitter is something else entirely. It is illegal in the U.S. for the end user to change the crystal in the transmitter. It must be changed by a facility that is capable of checking, and retuning if necessary, the output of the radio.
<font size="2">
If you are interested in the full text of the regulations concerning this matter they can be found at:</p>
</p>
[link=http://www.access.gpo.gov/nara/cfr/waisidx_04/47cfr95_04.html]FCC Title 47, Part 95 - Personal Radio Services[/link]</p>
</p>
Copied from Futaba's website</p>
How do I change the frequency of my transmitter? </p>
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. </p>
The applicable Federal Regulation is as follows: </p>
TITLE 47—TELECOMMUNICATION COMMISSION (CONTINUED)</p>
PART 95—PERSONAL RADIO SERVICES</p>
</p>
Subpart E—Technical Regulations</p>
Sec. 95.645 Control accessibility.</p>
(a) No control, switch or other type of adjustment which, when </p>
manipulated, can result in a violation of the rules shall be accessible </p>
from the transmitter operating panel or from exterior of the transmitter </p>
enclosure.</p>
(b) An R/C transmitter which incorporates plug-in frequency </p>
determining modules which are changed by the user must be certificated </p>
with the modules. Each module must contain all of the frequency </p>
determining circuitry including the oscillator. Plug-in crystals are not </p>
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. </p>
The applicable Federal Regulation is as follows: </p>
TITLE 47—TELECOMMUNICATION COMMISSION (CONTINUED)</p>
PART 95—PERSONAL RADIO SERVICES</p>
</p>
Subpart E—Technical Regulations</p>
Sec. 95.645 Control accessibility.</p>
(a) No control, switch or other type of adjustment which, when </p>
manipulated, can result in a violation of the rules shall be accessible </p>
from the transmitter operating panel or from exterior of the transmitter </p>
enclosure.</p>
(b) An R/C transmitter which incorporates plug-in frequency </p>
determining modules which are changed by the user must be certificated </p>
with the modules. Each module must contain all of the frequency </p>
determining circuitry including the oscillator. Plug-in crystals are not </p>
considered modules and must not be accessible to the user.
</p>
</p>
Copied from FCC regulations concerning this issue</p>
</p>
[Code of Federal Regulations] </p>
[Title 47, Volume 5]</p>
[Revised as of October 1, 2004]</p>
From the U.S. Government Printing Office via GPO Access </p>
[CITE: 47CFR95.221] </p>
[Page 539]</p>
TITLE 47TELECOMMUNICATION CHAPTER IFEDERAL COMMUNICATIONS COMMISSION (CONTINUED)</p>
PART 95_PERSONAL RADIO SERVICESTable of Contents </p>
Subpart C_Radio Control (R/C) Radio Service </p>
Sec. 95.221 (R/C Rule 21) How do I have my R/C transmitter serviced? </p>
(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.) </p>
(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. </p>
(c) Except as provided in paragraph </p>
(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: </p>
(1) Adjust a transmitter to an antenna; </p>
(2) Detect or measure radiation of energy other than the intended signal; or </p>
(3) Tune a receiver to your R/C transmitter. </p>
</p>
(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]</p>
[Revised as of October 1, 2004]</p>
From the U.S. Government Printing Office via GPO Access </p>
[CITE: 47CFR95.221] </p>
[Page 539]</p>
TITLE 47TELECOMMUNICATION CHAPTER IFEDERAL COMMUNICATIONS COMMISSION (CONTINUED)</p>
PART 95_PERSONAL RADIO SERVICESTable of Contents </p>
Subpart C_Radio Control (R/C) Radio Service </p>
Sec. 95.221 (R/C Rule 21) How do I have my R/C transmitter serviced? </p>
(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.) </p>
(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. </p>
(c) Except as provided in paragraph </p>
(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: </p>
(1) Adjust a transmitter to an antenna; </p>
(2) Detect or measure radiation of energy other than the intended signal; or </p>
(3) Tune a receiver to your R/C transmitter. </p>
</p>
(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]
</p>
</p>
[Code of Federal Regulations]</p>
[Title 47, Volume 5]</p>
[Revised as of October 1, 2004]</p>
From the U.S. Government Printing Office via GPO Access</p>
[CITE: 47CFR95.222]</p>
[Page 539-540]</p>
TITLE 47TELECOMMUNICATION</p>
CHAPTER IFEDERAL COMMUNICATIONS</p>
COMMISSION (CONTINUED)</p>
PART 95_PERSONAL RADIO SERVICESTable of Contents</p>
Subpart C_Radio Control (R/C) Radio Service</p>
Sec. 95.222 (R/C Rule 22) May I make any changes to my R/C station transmitter?</p>
</p>
(a) You must not make or have anyone else make an internal modification to your R/C transmitter.</p>
(b) Internal modification does not include:</p>
(1) Repair or servicing of an R/C station transmitter (see R/C Rule 21, Sec. 95.221); or</p>
(2) Changing plug-in modules which were certificated as part of your R/C transmitter.</p>
(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.)</p>
[48 FR 24894, June 3, 1983, as amended at 63 FR 36610, July 7, 1998]
[Title 47, Volume 5]</p>
[Revised as of October 1, 2004]</p>
From the U.S. Government Printing Office via GPO Access</p>
[CITE: 47CFR95.222]</p>
[Page 539-540]</p>
TITLE 47TELECOMMUNICATION</p>
CHAPTER IFEDERAL COMMUNICATIONS</p>
COMMISSION (CONTINUED)</p>
PART 95_PERSONAL RADIO SERVICESTable of Contents</p>
Subpart C_Radio Control (R/C) Radio Service</p>
Sec. 95.222 (R/C Rule 22) May I make any changes to my R/C station transmitter?</p>
</p>
(a) You must not make or have anyone else make an internal modification to your R/C transmitter.</p>
(b) Internal modification does not include:</p>
(1) Repair or servicing of an R/C station transmitter (see R/C Rule 21, Sec. 95.221); or</p>
(2) Changing plug-in modules which were certificated as part of your R/C transmitter.</p>
(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.)</p>
[48 FR 24894, June 3, 1983, as amended at 63 FR 36610, July 7, 1998]
</p>
</p>
[Code of Federal Regulations]</p>
[Title 47, Volume 5]</p>
[Revised as of October 1, 2004]</p>
From the U.S. Government Printing Office via GPO Access</p>
[CITE: 47CFR95.645]</p>
[Page 561]</p>
TITLE 47TELECOMMUNICATION</p>
CHAPTER IFEDERAL COMMUNICATIONS</p>
COMMISSION (CONTINUED)</p>
PART 95_PERSONAL RADIO SERVICESTable of Contents</p>
Subpart E_Technical Regulations</p>
Sec. 95.645 Control accessibility.</p>
(a) No control, switch or other type of adjustment which, when manipulated, can result in a violation of the rules shall be accessible </p>
from the transmitter operating panel or from exterior of the transmitter enclosure.</p>
(b) An R/C transmitter which incorporates plug-in frequency determining modules which are changed by the user must be certificated </p>
with the modules. Each module must contain all of the frequency determining circuitry including the oscillator. Plug-in crystals are not </p>
considered modules and must not be accessible to the user.</p>
[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]</p>
[Revised as of October 1, 2004]</p>
From the U.S. Government Printing Office via GPO Access</p>
[CITE: 47CFR95.645]</p>
[Page 561]</p>
TITLE 47TELECOMMUNICATION</p>
CHAPTER IFEDERAL COMMUNICATIONS</p>
COMMISSION (CONTINUED)</p>
PART 95_PERSONAL RADIO SERVICESTable of Contents</p>
Subpart E_Technical Regulations</p>
Sec. 95.645 Control accessibility.</p>
(a) No control, switch or other type of adjustment which, when manipulated, can result in a violation of the rules shall be accessible </p>
from the transmitter operating panel or from exterior of the transmitter enclosure.</p>
(b) An R/C transmitter which incorporates plug-in frequency determining modules which are changed by the user must be certificated </p>
with the modules. Each module must contain all of the frequency determining circuitry including the oscillator. Plug-in crystals are not </p>
considered modules and must not be accessible to the user.</p>
[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]
11-02-2010 | 04:03 PM
#4
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From: Middletown,
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RE: Crystal ?
Oh [email protected]'ve been doing this for a while. Looks like my nTX is supposed to be 72.610 or channel 41. Anyone know of a place to get cheap rx crystals. I'll buy a few channel 41 crystals and stay with that.
Thanks for the input...
Thanks for the input...
11-02-2010 | 04:14 PM
#5
Senior Member
RE: Crystal ?
What's your TX ?
Different brands charge differently for their RX crystals. I was in a LHS the other week that had their crystals marked down. They were doing it for some humor, as well as thinning stock they figured was going to be around for awhile otherwise.
Different brands charge differently for their RX crystals. I was in a LHS the other week that had their crystals marked down. They were doing it for some humor, as well as thinning stock they figured was going to be around for awhile otherwise.
11-02-2010 | 04:20 PM
#6
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RE: Crystal ?
Futaba T6EXA. I see some online.
http://www.himodel.com/radios/HiMode...pe_HC-50U.html
Says Futaba compatable. Would these work
Thanks again
http://www.himodel.com/radios/HiMode...pe_HC-50U.html
Says Futaba compatable. Would these work
Thanks again
11-02-2010 | 04:24 PM
#7
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RE: Crystal ?
That is the single conversion.
How about these:
http://www.himodel.com/radios/HiMode...al_HC-50U.html
How about these:
http://www.himodel.com/radios/HiMode...al_HC-50U.html
11-03-2010 | 10:10 AM
#10
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From: Middletown,
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RE: Crystal ?
I am going to pick up a few channel 41 rx crystals tonight 13 bucks a whack) , but I noticed that on one of my receivers it has a ch 20 sticker. I assume that is low band. Is it OK to put a channel 41 crystal in a receiver meant for a ch 20?
Thanks again
Thanks again
11-03-2010 | 12:41 PM
#11
Senior Member
RE: Crystal ?
Iget all my crystals here. http://www.performancedevices.com/home
Iwas sceptical about weither they were any good since they are so inexpensive so I had one sent to a friend of mine for analysis, he said they are dead accurate.
He carries both receiver and transmitter matched sets in many differnt brands and is really easy to deal with.
Iwas sceptical about weither they were any good since they are so inexpensive so I had one sent to a friend of mine for analysis, he said they are dead accurate.
He carries both receiver and transmitter matched sets in many differnt brands and is really easy to deal with.
11-03-2010 | 04:43 PM
#12
Senior Member
RE: Crystal ?
<span style="color: rgb(255, 0, 0);">OH SNAP!!!!!
Ijust got an email from Performande Devices stating he will sell any RCU member receiver crystals for $6 apiece SHIPPED in the USA BABY!!!
Now that is just too cool!!! </span>
Ijust got an email from Performande Devices stating he will sell any RCU member receiver crystals for $6 apiece SHIPPED in the USA BABY!!!
Now that is just too cool!!! </span>
11-03-2010 | 06:03 PM
#13
My Feedback: (1)
RE: Crystal ?
ORIGINAL: shanet75
one of my receivers it has a ch 20 sticker. I assume that is low band. Is it OK to put a channel 41 crystal in a receiver meant for a ch 20?
Thanks again
one of my receivers it has a ch 20 sticker. I assume that is low band. Is it OK to put a channel 41 crystal in a receiver meant for a ch 20?
Thanks again
Maybe then possibly maybe not, you never identified which rX's you have. Most older Futaba Rx's were center tuned to either the upper or lower half of the band. This is unlike other brands or the newest Futaba Rx's which are center tunned accross the entire band.
So if you have one of the hi/lo tunned Futaba Rx's then channel 35 is the demacation and if it was ch 20 then it you cannot us a ch 41 crystal in it and receive full performance. To make this change you would need the send the Rx in for a retune. Agine this does not apply to other brands and was just a Futaba thing.
John
11-04-2010 | 12:07 PM
#14
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From: Garland, TX
RE: Crystal ?
ORIGINAL: shanet75
Anyone know of a place to get cheap rx crystals. I'll buy a few channel 41 crystals and stay with that.
Thanks for the input...
Anyone know of a place to get cheap rx crystals. I'll buy a few channel 41 crystals and stay with that.
Thanks for the input...
11-04-2010 | 12:12 PM
#15
Senior Member
RE: Crystal ?
But you have to mail the crystal to them which costs and you are probably getting back a used crystal. Iwill look into it but Ibelieve I remember being told that crystals have a shelf life. Iwill seek further information on it.
11-04-2010 | 04:05 PM
#17
Senior Member
RE: Crystal ?
<font color="#0000ff"><font face="Times New Roman"><font size="3">"S<span class="ecx954264117-04112010">helf life in crystals has to do with AGING as the stability tolerance @ 25oC declines, usually 5ppm for the first year and 1-2ppm every year thereafter."
</span></font></font></font><span style="color: rgb(0, 0, 0);"><font face="Times New Roman"><font size="3"><span class="ecx954264117-04112010">Oh cool, he just changed his home page to welcome RCU members. </span></font></font></span><font color="#0000ff"><font face="Times New Roman"><font size="3"><span class="ecx954264117-04112010">
</span><span class="ecx954264117-04112010"><span style="color: rgb(0, 0, 0);">Isee he also has the matched sets at that same price, excellent. </span></span><span class="ecx954264117-04112010">
</span></font></font></font>
</span></font></font></font><span style="color: rgb(0, 0, 0);"><font face="Times New Roman"><font size="3"><span class="ecx954264117-04112010">Oh cool, he just changed his home page to welcome RCU members. </span></font></font></span><font color="#0000ff"><font face="Times New Roman"><font size="3"><span class="ecx954264117-04112010">
</span><span class="ecx954264117-04112010"><span style="color: rgb(0, 0, 0);">Isee he also has the matched sets at that same price, excellent. </span></span><span class="ecx954264117-04112010">
</span></font></font></font>
