Billy Hell

My Feedback: (2)

I'd like to see how many JR owners vs Futaba or Hitec owners get hit alot. I was talking with some flying buddies and it seems that JR owners experience more trouble with getting "hit". Since JR is on a slightly different frequency (I'm assuming this since a JR radio won't talk to a Hitec or Futaba RX) maybe that has something to do with it. Any thoughts?

Traxxas_Tech

My Feedback: (22)

I have never been hit with my JR system. I changed from Futaba where I would be hit every outing. One club member lost his P40E at a warbird fly-in because of a Futaba hit.

Where I am, different radio brands seem to work well in different locations. In Greenville, Airtronics never gets hit, but everything else does. In Mesquite, JR is best. In North dallas/Frisco, JR and Futaba are good...

I dont understand it... All I can say is from personal experience. I happen to like JR the best. Its been good to me

bob_nj

My Feedback: (62)

Although I'm not an electrical engineer or anything, I don't think JR is on a different frequency per se. There seems to be two ways to rig a receiver as far as "shift" goes. Futaba and HiTech use positive shift, and JR uses negative. OK all you gurus, have at it

hilleyja

My Feedback: (3)

bob_nj
Correct!!! And, oh-by-the-way, Hitec Prism 7 and Eclipse 7 allow you to switch the shift direction in the TX so you can be compatible with both.

Billy Hell

My Feedback: (2)

Then maybe I should turn my theory around. It's not the brand but the location that affects hits to certain radios.

Ladyflyer

My Feedback: (2)

I have 4 Futaba radios that take what appears to be a multipath glitch at one spot in our field with the TX antenna pointed at the plane ! (I know that's a no-no) All are on 06 and they all do it now and then and have done it for years. I have an old JR 622 on 06 that has NEVER taken a hit there. The 622 has done some wierd stuff when flown further out. I have had VERY good results with Hitec receivers and JR or Futaba transmitters.
On72 Mhz the Futaba and JR use opposite polarity shift for pulse encoding. Neither method has advantage over the other. It has more to do with marketing than engineering.
On 50/53 Mhz they are the same.
From what I have SEEN the single conversion JR receivers are not a good bet in more urban flying conditons. The new R700 is only a single conversion RX. Don't let the ABC&W mumbo jumbo hype sway you too much either. Still hard to beat dual conversion receivers.

Billy Hell

My Feedback: (2)

I am a Futaba 8uhfs and hitec rx. No problems yet. We have a flying buddy (we fly at a 240 acre sod farm in the middle of nowhere) that uses JR equiptment and is always getting hit. We Hitec/Fubaba users have never been hit. At another state field it seems that the JRs get hit.

Jim_McIntyre

Uh, instead of comparing brands, maybe you could compare frequencies of the radios getting hit?

bob_nj

My Feedback: (62)

Pagers are a problem in our area around Ch 26

lnorris

My Feedback: (1)

I can backup what Ladyflyer said earlier. We have a field in the middle of our city (by a lake). I have heard that you almost can't use JR receivers there but Futaba or Hitec (dual conversion) does fine. Where we fly outside of the city, both do fine.

Note though that I'm talking about the receivers. I believe most of the JR flyers there have gone to dual conversion Hitec receivers.

visioneer_one

My Feedback: (506)

posted as a seperate thread.

FCC

I am using JR RXs, R600 and R700 without any glitch problems in the middle of the city at 2 different fields. Strange you guys having problem..? At our field there are almost all JR users with some on adjacent channels with no problem.

JoanC

I think you must have dual conversion if you care for your plane. It really is a security feature. Have you tried multiplex IPD DS receivers?

Steve Collins

My Feedback: (8)

By the looks of all the posts above, there really is not an answer to your question. It all has to do with the RF environment you are flying in. In one situation, the JR may be more sensitive to that particular RF noise than another brand but there is an endless set of circumstances that r/c can relate where this brand or that brand seems to be getting hits and others don't. There is no clear answer that will fit every persons situation.

johnhardy1

At my field the only planes Ive seen get hit are flown by JR electronics although with the exception of a few guys flying Hitec and me flying Futaba everyone pretty much flies JR.

Also, I thought JR and Airtronics was positive shift and Hitec and Futaba were negative shift ? Do I have it backwards ?

michael lewis

My Feedback: (1)

Sence I started flying heli's with my JR radios the only hits I 've had are, one bird feeder, "total loss" one rose bush, It will most likely return next spring and the neighbors cat, he is not coming back! Thanks for putting up with me Michael

Dansy

My Feedback: (53)

No they are not...it's also dependant of the set-up I never get hit with my equipment.....but I do send it for alignment every winter, and I'm also very carefull with the radio installation....especially were the antenna will be, in most of my ship I run the antenna inside the fuselage.

Daniel D.

Ladyflyer

My Feedback: (2)

FCC
Quote:
"I am using JR RXs, R600 and R700 without any glitch problems in the middle of the city at 2 different fields. Strange you guys having problem..? At our field there are almost all JR users with some on adjacent channels with no problem"

People in MORE rf soaked environments having interference problems with single conversion receivers while you are not is by no means "STRANGE" or amazing . Adjacent channels are NOT the only issue,FAR from the only source. :stupid:
. A BIG City " in some regions may have two poppy fields a gas station an aspirin factory an apartment building and one transmitter .There are many 'BIG CITIES" that may not have the RF sources on the right freqs at the right distance to cause problems. When they ARE present the SC will be more prone to taking hits than the DC receivers .

JR has made some real good receivers. The single conversion receivers may be OK in some areas,but when it is NOT the DC is a better bet. If you need a tiny receiver for a park flyer they may be OK. In a bigger more powerful plane I wouldn't trust a SC RX ! ABC&W or not



Play it safe ,avoid SC and ABC&W . In theory and in the REAL world ,the SC is not the performer a good DC receiver is PERIOD !

rcdemon61

My Feedback: (7)

Guess I may as well add my 2 cents. used to fly Futaba at a field that was surrounded by those darn towers, and planes were going down. Most of the pilots switched to JR and the problems went away. I believe the signals on JR to be almost bullet proof, I have great range with the antennae down, much farther then the Futaba I had.

solarvolt

My Feedback: (3)

Well....looks like I'm the odd-ball one here. Ever since I converted to Multiplex, I have had (0) hits everywhere I've flown. This system is something else...and NO, I'm not doing a commercial.
I started off with Futaba when they came out Many, many years ago)...then went to JR and then Hitec. I had hits on pretty much all of 'em no matter what part of the country. Oh well......enough talk....time get back to TurboCad. Jim

Ladyflyer

My Feedback: (2)

It is not ,in my experience a JR vs Multiplex vs Futaba vs Airtronics issue. Like I have been trying to say,THE SINGLE CONVERSION RECEIVERS do not have the interference rejection abilities of the DUAL conversion. All the manufacturers are making good gear but not all of their gear is good ! JR makes fine DC receivers ,they no longer include them in thier basic radios. If you want a better RX they let you pay more for it. Everybody is trying to cut costs.


My Ford Ranger outruns my neighbors Chevette Therefore Fords are faster than Chevys and Escorts must be faster than Corvettes

solarvolt

My Feedback: (3)

I completely understand what you stated earlier, however, I have used the upper-end radio gear of all the brands I mentioned, and was comparing the the dual conversion receivers on all......not to mention the IPD Multiplex receiver (that little puppy goes up and beyond what I was talking about). Now back to finishing up that design. Have a good one Jim

bob_nj

My Feedback: (62)

The link below is for the top of the line JR radio offered right now. It includes a single conversion receiver?
Are any of you flying the top of the line JR receiver in a large scale plane with acceptable results?

http://www.horizonhobby.com/products...*&pc=JRP1646**

Dansy

My Feedback: (53)

I will be running two new 955 receiver in my new pattern ship this year, they are very good, I have also run with success the 910 / 940 / 950 / 600 / 649 the only trouble I have ever had was with another brand inside my chopper...

Daniel D. (10X)

rcdemon61

My Feedback: (7)

Wow , this kind of blows me away. I was dumb enough to assume that most recievers were dual conversion these days? You sure they are not trying to make more money (greedy), verses trying to cut cost?