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HelicopterRadio - Servo - Gyro - Gov - Batt › Range problems with JR 8103
12-21-2003 02:58 PM  14 years agoPost 1
srslamalot

rrApprentice

Atlanta, GA

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I have a JR 8103 remote I just bought to replace an Airtronics RD6000. My problem is, I’m having a range problem. I’ve got in 3 of my helis Airtronics 92777Z, 7-Channel Micro Receivers. I bought a JR crystal to match the one that came with the remote, and it works fine, up to about 5 feet. The remote was sent to Horizon Hobbies, was fully checked out, and came back with a clean bill of health. They suggested I check my receiver install, and antenna routing. I’m wondering if it’s a problem with the receivers, and should I replace them with JR ones? Or should I have gotten an Airtronics crystal?
Any ideas.

Tom

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12-21-2003 03:03 PM  14 years agoPost 2
z11355

rrMaster

New England

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so you're using a JR crystal in an
Airtronics RX?

Crystals and RXs generally(almost always)
are 'tuned' to each other and you can't
just mix-match.

Make sure to use the same mfgr crystal
as the RX.

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12-21-2003 03:05 PM  14 years agoPost 3
capebob

rrVeteran

Cape Coral, FL

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If I understand your post you have put a JR crystal in an Airtronics receiver. If you have done this I'm surprised that it works at all. You must use an Airtronics crystal in an Airtronics receiver. If I misunderstand your post and you do have a JR crystal in a JR receiver then you may have the wrong crystal. JR receivers come in two flavors. Most are single conversion, but some are dual conversion. They require different crystals.

Bob

Success is the ability to go from one failure to another with no loss of enthusiasm. Churchill

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12-21-2003 04:29 PM  14 years agoPost 4
srslamalot

rrApprentice

Atlanta, GA

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You guys read it right,

JR Remote
Airtronics Receiver
JR Crystal

I was matching the crystal brand to the remote. I'll have to order some Airtronics Crystals.
Thanks for the help, you guys are awsome!

Tom

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12-21-2003 06:27 PM  14 years agoPost 5
G.Man

rrProfessor

Bristol

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Should have just orderd a JR TX Xtal to match the airtronics rx xtal's that you already had..

Don't Email me as I wont reply - PM Only (spam countermeasures)

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12-21-2003 08:19 PM  14 years agoPost 6
srslamalot

rrApprentice

Atlanta, GA

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Should have just orderd a JR TX Xtal to match the airtronics rx xtal's that you already had.. Galifrey
I didn't think to do this, because I read that your not supposed to pull the crystal from the module in JR equipment, yet others say it's not a problem. I was just playing it safe.

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12-21-2003 09:06 PM  14 years agoPost 7
G.Man

rrProfessor

Bristol

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srslamalot

yes you are right... in the US you should only change RX xtals...

sorry, my bad

Don't Email me as I wont reply - PM Only (spam countermeasures)

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12-21-2003 09:15 PM  14 years agoPost 8
9387ASH

rrElite Veteran

UK

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Dont you just love the FCC ??

Glad I live in the UK, where we can swap out crystals to our little hearts content !!! God.... could you imagine it ? Having to send all those JR Trannies to little old me !! I think I would crack up after a couple of hundred !!!!

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12-21-2003 11:19 PM  13 years agoPost 9
srslamalot

rrApprentice

Atlanta, GA

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And what happens if you pull the crystal from the JR module?

Tom

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12-21-2003 11:41 PM  13 years agoPost 10
9387ASH

rrElite Veteran

UK

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You then violate FCC Regulations, unless you are a qualified Radio Operator ( I believe ! ).

For some reason, in the USA it is illegal to change frequency yourself unless you are fully qualified. The correct procedure is to send the module ( or set ) to the authorised agency for crystal change. In this case you would need to send it to Horizon Hobby. They will carry out the crystal change and do an RF alignment on the transmit module.

There are plenty of threads relating to the FCC rules & regulations concerning channel changing.

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12-22-2003 12:33 AM  13 years agoPost 11
jb_turner

rrElite Veteran

USA

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It is only illegal if you change the Tx crystal inside the transmitter. On most JR transmiters the Tx crystal is located on the OUTSIDE of the module.

Hey Mac_Man ever get a caution about the 8417 posted on MacGregors Website?.

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12-22-2003 01:08 AM  13 years agoPost 12
9387ASH

rrElite Veteran

UK

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JB,

I havent had an opportunity to get past the Director yet. I will try and see him tomorrow before he gets tied up in phone calls etc.

I am glad you cleared that up for me, I was under the impression that all crystals ( apart from in RF Modules ) had to be done by authorised personnel.

All I can say is that I am glad we don't have that sort of ambiguity over here !!!

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12-22-2003 02:58 AM  13 years agoPost 13
srslamalot

rrApprentice

Atlanta, GA

My Posts: All  Forum  Topic

So is it ok to switch the crystal or not? And if it's not, it's because of the FCC, and not because it will screw up the remote or anything like that.
I'm really just trying to find out how to get to use the new remote, without range problems.

Tom

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HelicopterRadio - Servo - Gyro - Gov - Batt › Range problems with JR 8103
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