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JR 549 incompatible with 8411's?

Old 01-01-2003, 11:07 PM
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Default JR 549 incompatible with 8411's?

I've gotten used to the "buzz" of 8411's on big control surfaces, but I've had a lot of trouble with more pronounced "chatter" when running my big birds on a JR 8103 with 549 FM receivers.

It's not assoc. with engine on/off or engine type, so I'm pretty sure it's not interference.

One of the Horizon tech consultants tells me this is probably due to not using PCM (649) receivers with this setup. Since I own eleven of the 549's, it's gonna be a pricey switch, but I'm more than willing to do it if it solves the problem.

Anybody out there having similar problems with the 549?


mt
Old 01-01-2003, 11:10 PM
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Default JR 549 incompatible with 8411's?

No problems here with a plane with that very setup. I get the normal 'squeal' when the surfaces move and some occasional hum when they are at rest but nothing out of the ordinary.

Kevin
Old 01-01-2003, 11:20 PM
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Default JR 549 incompatible with 8411's?

You have no problems with 8103/549/8411's setup?

mt
Old 01-02-2003, 12:20 AM
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Default JR 549 incompatible with 8411's?

Oops, I'm using a JR 783, NOT a 8103, but I am using a 549 and 8411's.
Old 01-02-2003, 04:20 PM
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Default JR 549 incompatible with 8411's?

The 549 has had some problems when multiple digital servos are plugged into it, with the feedback of the servos to the receiver causing the servos to jitter. We have an update we can do to the 549 receiver to make it work with digital servos. To do this, just send in your receivers and we can perform the update for you. New receivers have this update from the factory.
Old 01-02-2003, 04:38 PM
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Default 549 update

Is this update necessary for using this with other digital servos? What if I have a combination of 8411 and 8231 servos connected?
Old 01-02-2003, 04:42 PM
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Default JR 549 incompatible with 8411's?

It is not dependent on the exact servo used, and just one or two digital servos, it may not even be noticed. But several digital servos on the receiver causes too much feedback for the 549 and it can cause the servos to jitter.
Old 01-02-2003, 05:48 PM
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Default JR 549 incompatible with 8411's?

Final question. Are other JR receivers affected with the same issue as the 549? I have a couple of R-226 and R600 receivers.
Old 01-02-2003, 06:40 PM
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Default JR 549 incompatible with 8411's?

It just applies to the 549 receiver.
Old 01-02-2003, 10:14 PM
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Default JR 549 incompatible with 8411's?

Thanks for the info.

What's the procedure for sending in my receivers? I have two that probably need updating.
Old 01-02-2003, 10:16 PM
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Default JR 549 incompatible with 8411's?

Fill out this form and send it in to the address listed on it, and the techs can perform the update. http://www.horizonhobby.com/media/pd...rchecklist.pdf
Old 01-04-2003, 02:10 PM
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Default 549's

Thanks for your help. You've been very straightforward.

My plan is to buy enough 649's to switch my gassers and digital setups to PCM. And send in the 549's to be "rehab'd" and used for smaller setups.

Partly because of the piece on range testing in Horizon catalog recently.

mt
Old 01-06-2003, 02:22 PM
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Default JR 549 incompatible with 8411's?

No problem! If there is anything we can do for you, please let us know.
Old 01-07-2003, 05:06 AM
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Default Follow up report

Changed over my first plane to JR 649 (PCM) receivers. (8103 system with nine 8411's)

HUGE improvement. Even the gyros seem to work better. All the chatter and most of the buzz are gone.

mt
Old 01-29-2003, 03:31 PM
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Default JR 549 incompatible with 8411's?

Have you sent in your 549 receivers for updating yet? I'd like to know what sort of turnaround time to expect.
Old 01-29-2003, 03:32 PM
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Default JR 549 incompatible with 8411's?

Our repair turn around times right now are 3 to 4 days average, however if you have a 549 receiver that is having problems with digital servos I would recommend giving one of our techs a call at 877-504-0233.
Old 01-29-2003, 07:35 PM
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Default JR 549 incompatible with 8411's?

Danny,

I am the last to be negative on JR service, but there seems to be a disconnect in Horizon Service that there is no update to the 549's. I sent both mine in and service said they didn't know what I wanted done because they have no updates to the 549's.

Since this forum seems to be talking about this allot, could you help us get the correct answer?

Mark
Old 01-29-2003, 08:13 PM
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Default JR 549 incompatible with 8411's?

There must have been some confusion when you sent your receivers in. Please give one of our product support techs a call and we can get this situation straightened out for you.
Old 01-29-2003, 11:48 PM
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Default JR 549 incompatible with 8411's?

They called me!! If needed, someone can email through rcuniverse. I don't want to compalin about JR service. It is outstanding. I just think there is some confusion about this at Horizon. I was basically told not to use the 549's with digital equipment.

mark
Old 01-31-2003, 12:44 AM
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Default JR 549 incompatible with 8411's?

Hey guys, the ultimate solution (and sensible as well) is to install an EMS/Jomar "Glitch Buster" opto isolator/buffer unit. Run the reicever on a little AAA NiMh 4 cell pack all weekend. Use a 4 or 5 cell pack on the "servo side" of the unit, and your problems will slip away like a jolly rancher on your tongue. It's safer too, since the output of the Glitch Buster can handle 8 servos without a problem (on each channel!!). It also eliminates ALL opportunities for noise in the servo system to back up into the reciever - this is the root of most "noise" problems...

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