BIG problems with Eclipse7's in AUSTRALIA  
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All Forums >> Radios, Batteries, Clubhouse and more >> RC Radios, Transmitters, Receivers, Servos, gyros >> Radio Manufacturer Direct Support >> Hitec/MultiPlex Radios- Ask Hitec Customer Service >> BIG problems with Eclipse7's in AUSTRALIA
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BIG problems with Eclipse7's in AUSTRALIA - 2/15/2004 8:19:16 AM   
paranoid


 

Posts: 35
Joined: 7/17/2003
From: melb. , AUSTRALIA
Status: offline 		Wondering if any other fliers are having big "hits" with their E7 especially QPCM.
Since we bought 2 of them on 36.41/36.43 mhz, we have done nothing but lose planes. There are now 4 of us in our club experiencing similar probs. Basically takes off no problem, flies for a while then says goodbye to its maker. We are all experienced fliers, so metal contact, antenna loc. etc already considered
We have tried several different rec's in 6 or more planes with same results. Needless to say we are losing $$ at a rapid rate. Both sets we bought (QPCM) have been back to model engines in Victoria twice. Retuned (1) first time then stated no probs the other times.
We are needless to say getting very frustrated. JR and FUTABA radios on these frequencies are not getting any problems apart from the occasional glitch.
We are talking full servo deflection here or full lock out in case of Qpcm.
Any help or advice would be greatly appreciated.
Thank you
JA.
       Post #: 1

RE: BIG problems with Eclipse7's in AUSTRALIA - 2/15/2004 8:59:53 PM   
XJet


 

Posts: 3464
Joined: 3/31/2003
From: Tokoroa, NEW ZEALAND
Status: offline 		How much range do you get when testing with the aerial down?

Sounds suspiciously like a 40Mhz set that someone's tried to "pull" down to 36Mhz by retuning and, as a result, is suffering low receiver sensitivity.

Band-changing (as opposed to intra-band frequency changing) can be quite a complex operation and unless it's done very carefully you can end up with all sorts of odd things going on -- such as oscilators running at the wrong crystal overtone, etc. Such mistakes can produce a set that works on the bench-- but which is unstable or which has very limited range once tossed into the air.

(in reply to paranoid)
       Post #: 2

RE: BIG problems with Eclipse7's in AUSTRALIA - 2/16/2004 12:33:38 AM   
SmoothPass


 

Posts: 104
Joined: 2/1/2004
From: Melbourne, AUSTRALIA
Status: offline 		Yes I'm getting not very good range, and big hits with my QPCM. Its on 36.250
Using QPCM receiver or PPM receiver, range is around 5 meters,(pretty scary).
All of my other radios when used have around 30-50 meters range with arial in.

(in reply to XJet)
       Post #: 3

RE: BIG problems with Eclipse7's in AUSTRALIA - 2/16/2004 10:50:34 AM   
SmoothPass


 

Posts: 104
Joined: 2/1/2004
From: Melbourne, AUSTRALIA
Status: offline 		I should also add that I have flown with the radio and it seemed to work okay.
Just compared to my flash 5 radio, it, the Eclipse QPCM doesnt seem to have the same range with arial down.
However the range does improve when I use it on one of my planes that doesnt have digital servos in it!, maybe its the digitals?
Good luck with it.

(in reply to SmoothPass)
       Post #: 4

RE: BIG problems with Eclipse7's in AUSTRALIA - 2/16/2004 11:37:42 AM   
paranoid


 

Posts: 35
Joined: 7/17/2003
From: melb. , AUSTRALIA
Status: offline 		Thanks for replies.
XJET- it really seems like you know your stuff! although i am only a layman with respect to ppm/pcm tech. We really need help to pin the source and get somebody to admit something is wrong here, how can i back this up? We dont want our planes replaced, just dont want to lose anymore !
SMOOTHPASS- "ditto" This is exactly what we are experiencing. To this day my old trusty focus 4 outdoes range check on Eclipse every time!

I am getting about 40 paces "thumb high" range check, even taxiing entire runway to no avail once airborne. We do have a "corridor of death" as such were you can expect the occasional hit flying in or out of the "corridor".
Wonder if there is some sort of interference specific to hitec and not others.?
I really dont want to just go out and buy a JR or FUTABA, none of us would be comfortable with selling our "problem" to somebody else. I like to think i sleep well at night.
thank you

(in reply to SmoothPass)
       Post #: 5

RE: BIG problems with Eclipse7's in AUSTRALIA - 2/17/2004 6:35:21 PM   
Mossie



Posts: 83
Joined: 11/29/2003
From: Christchurch, NEW ZEALAND
Status: offline 		I too am getting big hits with my E7 at around 100ft while flying, on 40mhz PPM rather than QPCM. All 3 of my superslim7 rxs on the 40mhz band are affected, all in different airframes (foam slope gliders!!). I've tried new tx and rx xtls, changing channels from 485 to 451 to 465, with no improvement, I even change flying sites to see if the problem is local......nope. A fellow pilot switched to Futaba after he felt it was his E7 that killed his Sig extra due to limited or no response at moderate range of 200ft, all other causes were checked out such as battery pack, switch harness, push rods, other txs at the site, etc.
I have several indoor helis which so far seem ok with their SS7 rxs and the E7 (max flying range thou is only 30-50ft away), however my confidence in the radio is gone.

I'll be buying Futaba from now on.

(in reply to paranoid)
       Post #: 6

RE: BIG problems with Eclipse7's in AUSTRALIA - 2/17/2004 8:00:26 PM   
XJet


 

Posts: 3464
Joined: 3/31/2003
From: Tokoroa, NEW ZEALAND
Status: offline 		Mossie, what servos are you using, what type/capacity of receiver battery do you have, and were you flying alone when you noticed these "hits"?

< Message edited by XJet -- 2/17/2004 8:00:58 PM >

(in reply to Mossie)
       Post #: 7

RE: BIG problems with Eclipse7's in AUSTRALIA - 2/17/2004 9:11:02 PM   
Mossie



Posts: 83
Joined: 11/29/2003
From: Christchurch, NEW ZEALAND
Status: offline 		Hi Xjet.

Most of the time I am flying alone. It makes little difference if other TXs are around or not.

First model is a 2 ch JW foamy with a SS7(no1) 485 xtl pair of ty1 05057MG micro servos, 5cell 600SCR rx pack. Limited range with this model, maybe 250 ft max.

Next glitcher is a 4ch 60" foam racer with 2xhs81MG wing servos and 2xGWS naros with SS7(no2) on 451 with a 4cell 720nimh pack.
Almost unflyable with a 100ft range.

Next on the list is a Spirt Elite 2m balsa ship, SS7(no3) on 485. 6xhs81MG servos, golden rod pushrods, 4cell 600mah sanyo pack.
Almost unflyable with a 100ft range.

When I first got this Tx I had little or no glitches with other foam models using these rxs. The major problems started with the Elite which was always a little glitchy but got worse over time. Since then things have been quite bad. I had the radio checked out and tuned once, no improvement. Had the rxs checked and tuned, no improvement.
Changed ALL of my xtals for no improvement. Swapped tx antenna for new one, even tryed rubber ducky. No improvement.

I do have more success when using GWS naro receivers.

I have had several experienced flyers look at my models and the radio installations, no faults found.

Hitec have tried to help but the gremlin still exists.

edit: I should add that I thought I had solved the problem in the 60"racer when I removed the aileron extension wires. The model range checked out ok but problem returned upon moving to the flying site.

< Message edited by Mossie -- 2/18/2004 9:52:42 AM >

(in reply to XJet)
       Post #: 8

RE: BIG problems with Eclipse7's in AUSTRALIA - 2/17/2004 11:13:33 PM   
XJet


 

Posts: 3464
Joined: 3/31/2003
From: Tokoroa, NEW ZEALAND
Status: offline 		Is there anyone flying on the same frequency as you who has a different (non-Hitec) receiver so that you can try yoru transmitter with their flight pack?

If you can determine whether it's the receivers or transmitter then that's half the battle.

You say you get better results with the GWS receiver -- how much better?

(in reply to Mossie)
       Post #: 9

RE: BIG problems with Eclipse7's in AUSTRALIA - 2/18/2004 12:33:46 AM   
mglavin



Posts: 5203
Joined: 11/29/2001
From: Elverta, CA, USA
Status: offline 		Sounds like you have range problem, more likely than not based on your comments the TX maybe the problem. Why not return it to Hitec Service for evaluation. Be sure and include the TX modules in use, I would also send in the RX's if possible. Better safe than sorry.

You mention "almost unflyable with a 100' range". Antenna down range check or?

_____________________________

Michael Glavin
RCU Community Moderator
Hitec * Multiplex Field Representative

(in reply to XJet)
       Post #: 10

RE: BIG problems with Eclipse7's in AUSTRALIA - 2/18/2004 4:11:16 AM   
Mossie



Posts: 83
Joined: 11/29/2003
From: Christchurch, NEW ZEALAND
Status: offline
quote:

ORIGINAL: mglavin

Sounds like you have range problem, more likely than not based on your comments the TX maybe the problem. Why not return it to Hitec Service for evaluation. Be sure and include the TX modules in use, I would also send in the RX's if possible. Better safe than sorry.

You mention "almost unflyable with a 100' range". Antenna down range check or?


It is going back again this week. I already sent it away once with 2 of the rxs.

the antenna is fully extended, still only 100ft range.

Im thinking of swapping to 72mhz anyhow so that may help.

I have tryed futuba rxs in place of the rx and things improved a little but still glitchy with limited range.

For some reason the gws rx seem to have the least glitches and the greatest range. I dont know why. They still arent perfect, but without doubt the best so far.

(in reply to mglavin)
       Post #: 11

RE: BIG problems with Eclipse7's in AUSTRALIA - 2/18/2004 4:49:32 AM   
XJet


 

Posts: 3464
Joined: 3/31/2003
From: Tokoroa, NEW ZEALAND
Status: offline 		You might be interested in the receiver shoot-out I'm doing at the moment in which I'm comparing as many of the current crop of RC receivers as I can, measuring performance in a number of important areas such as noise-rejection, sensitivity, cross-mod/inter-mod, etc.

It will be interesting to see how the universally praised Hitec gear compares to offerings from the likes of FMA.

As for going to 72Mhz, I've got an Eclipse 7 with the Spectra module which I use with a Hitec Supreme and Hitec 555 receivers. So far I've had no problems at all -- except I'm going to have to upgrade the transmitter batteries to NiMh because the standard 600mAh Nicads are pittiful.

(in reply to Mossie)
       Post #: 12

RE: BIG problems with Eclipse7's in AUSTRALIA - 2/18/2004 6:26:33 AM   
mglavin



Posts: 5203
Joined: 11/29/2001
From: Elverta, CA, USA
Status: offline 		Moosie

Is the service center in New Zealand; in any case is it an approved service center or a Hitec facility?

You HAVE a range problem if your experiencing problems at 100' with the antenna extended.

Did you purchase this set new? Has it been retuned, crystals changed out, RX's originally manufactured for the frequency and or band used in your world. Do the RX's you have tried other than Hitec products require retuning with crystals change outs? Are these all Dual Conversion RX's with the appropriate crystals? Are you changing out the TX module when changing out frequencies? Are you using a Spectra module?

_____________________________

Michael Glavin
RCU Community Moderator
Hitec * Multiplex Field Representative

(in reply to Mossie)
       Post #: 13

RE: BIG problems with Eclipse7's in AUSTRALIA - 2/18/2004 9:15:58 AM