RE: Spektrum DM9 systems
 

Just ordered my Spektrum JR Module with AR9000. I take it that the receiver antenna works okay inside the model? Anyone know the best position for receiver and satalite inside my boomerang, or does it not matter?

RE: Spektrum DM9 systems
 

Hi Ray
Sorry about that. Maybe I can sell you a JR TX ;)
2 weeks is what we have been told by our supplier :eek:
Regards Al

RE: Spektrum DM9 systems
 

Hiya Ali, I only just bought the FF9 from you last year, In hindsight i think i should have bought JR then, but all of my stuff is Futaba for the last 20yrs. I'll send the JR module back & sit tight for the Futaba to come in. Cheers for now. Ray.

RE: Spektrum DM9 systems
 

Guys,
Just got back from the field from testing mine.

It failed its original range check, only got 8 paces.
Checked with a DX7 tranny and got 50 paces.
So returned the module to the shop, test flew the new one in a foamy, after a successful range check.

Also got the glitch counter at the same time. After a quick second foamy flight, no fades, or frame losses occured.

Test flew it in a boomerang.
over 200 fades on both antennaes, and 51 frame losses, but no holds.

Is this normal, what does this mean.??????

(It was a 8 minute flight)

RE: Spektrum DM9 systems
 

I use a DX7 TX with the AR9000 RX in a KingCat using both remote RX's. MOST flights record under 50 fades, never any frame losses and of course no holds. I'd reposition the rx's.

Dave

RE: Spektrum DM9 systems
 

I responded to you post on RCG.

David

RE: Spektrum DM9 systems
 

I just installed my AR9000/XP9303 on my BARF. Should I be worried?

David

RE: Spektrum DM9 systems
 

you have a picture of yours? (instalation)

RE: Spektrum DM9 systems
 

Copy of my post on RCGroups.
(no, you should not be worried... these turbine AR9000 installs are working extremely well... best link available (periodd) IMHO).

Hi,

A and B are the two 'internal' Rx's (with monopoles).

I suspect you are also using L and/or R (external remote Rx's with Dipoles).

If you are, I would be curious to know the numbers on them. The are ussually better than the A and B (likely because the can be mounted in a more 'remote' location that is not populated by as many wires and so forth).

I would say your fades are on the medium high side for a turbine jet, but not really out of the ordinary for A and B.

I would hope with two remotes L and R, in a jet, your frame losses would be a little lower... maybe 0 to 30. (that is what I see in my Mig 15, and what several of us have been seeing in our turbine jets. I would say I have seen a LOT of data at this point... and all working well).

You are not getting any holds, and are probably not loosing enough frames to feel it. (a HOLD is about 44 frames IN A ROW).

(I would say average performance in a complex turbine jet flown hard, far, and fast may be A: 200 B: 200 L: 40 R: 40 Frames: 20 Holds 0) Your mileage may vary. Happily, I have monitered and checked out a lot of jets with the AR9000 and have not seen a HOLD yet.
By the way, most of my AR9000 experience is in very complex and dense (metal/carbon etc) aircraft that are flown far compared to typical models. I am quite sure the numbers would be lower in most applications.

I flew my Mig 15 in the drizzling rain very far out at the JWM in Ireland, and still go good numbers.

Personally, I reccomend both remotes in a turbine... $30 or so is cheap peice of mind in this kind of equipment. While I am offering my personal opinions... Observe how you hold the Tx, and orient you antenna so you do NOT point it at the aircraft... I choose... more or less perpedicular to the ground up... In my experience, the data is better if this technique is used.

(I have also seen numbers sometimes build up during taxi out and back (far on the ground etc) more so than in the air.)

Have Fun,
David

RE: Spektrum DM9 systems
 

Thanks for that Dave. I did search RC Groups but couldn't find your post. Very encouraging.

Gordon

RE: Spektrum DM9 systems
 

Thanks guys for the comprehensive replies,

I just rechecked my figures, and i got 348 on the R remote reciever.

Pictures on install are pending.

In the meantime, ive moved the reciever around, and as secondary remotes arent available in the UK yet, (DW do tell me otherwise....), ive had to nick one from another 7000 reciever.

Im flying later today, tomorrow morning so ill post results then.

RE: Spektrum DM9 systems
 

i have just finished a new Flash

put a ar9000 in there

got the R one in the tail section all the way up
the L in the nose and the main in the middle

RE: Spektrum DM9 systems
 

I would reposition the R remote... ideally, you should have antenna's running on all three (x,y,z ) axis', with good separation for 'path diversity'.
FWIW, I like to have one 'vertical' rx antenna mounted as high in the model as practical. This ussally gives the best range 'on the ground'.
I also make an effort to have one near the nose, and one near the tail to minimize any chance for blocking, or local multipath, etc.
(I could be accused of overthinking this, but I do have a great track record with planes I have helped set up... including QQ, Scott Harris, and Dewey D.)

Range testing and moving the plane around can be pretty educational! I reccomend range testing for sure!

Interested in seeing your photos.

David

RE: Spektrum DM9 systems
 

Yes, very good....
This is what I have in my Mig...
R - 'mustache' in the nose.
L - Vertical in the lower half of the fin.

Rx - Midships with one antenna fore/aft/CL, and one pointed left side.

All 3 axes are covered... including 2 horizontal (across fuse) as it worked out.
Front/Back... covered
Vertical and High for best ground range... covered
Overkill..., maybe, but peice of mind... priceless.

David

RE: Spektrum DM9 systems
 

delete double post

RE: Spektrum DM9 systems
 

Posted pic of my install, please excuse the reciever position, id moved the velcro but you can see where it was in relation to powerbox and ECU.

Ive now swapped the position of the ECU and the reciever main unit.
Ive added a second remote reciever and checked groudn range.

Got sixty paces this time, in contrast to thirty yesterday at the field.
( admittedly i did the range check at home under different circumstances and with the extra reciever so i had changed two variables.)
Im only using 6 in extensions, my longer ones arrive tomorrow so ill get the remotes even further apart before i fly.

RE: Spektrum DM9 systems
 

Went flying today and had three flights, these are the results. (Note im using 2 remotes on standard 6" leads)
the main reciever unit is beside my powerbox, the Left reciever in the nose as far as i can get it, and the Right recievers positioned was varied.

The only difference between flights was the position of the R remote reciever.
Flight One- towards the rear, about 2" from the ECU and 2" from the fuel pump
fight Two- forward, about 3" from main reciever unit but nearer two jetronic valves
Flight Three-on a JR multibox.


Flight ONE TWO THREE

A 232 226 255
B 341 382 771

L 60 74 95
R 626 452 999

F 4 7 30
H 0 0 0


Flight three was a longer flight, 12 mins opposed to 8-10 of the other two.
Im relieved to see the number of frames dropped is lower than my previous days flight, especially on the first two flights today, but still perturbed to see A and Bs figures so much higher than L+R

Ill try moving the main reciever further away from the powerbox for next flight sessions and i should have my 24" extension leads for the remotes tomorrow.

RE: Spektrum DM9 systems
 

Here are some pictures of my installation for reference. JR 10X transmitter, and my numbers are so low when I get back from flying that I keep thinking that I forgot to plug in the rx.;)

I only have one remote that you see mounted in my engine compartment with the antenna's going vertical, this still gives me the best signal. I have zero to two antenna fades per flight.......yep thats right.......0-2 on average.

"Put your planes rektum in a spektrum"...............should be the new slogan


Buy your Spektrum this week from Alshobbies.com and get a free lap dance from Volkan.

RE: Spektrum DM9 systems
 

I would look for a new location for the R recevier.

RE: Spektrum DM9 systems
 

Two more flights today.

Flight one- R reciever on 12" lead, located on boomerang fuel tank.

Flight Two-R reciever in same position, but main reciever rotate 45 degrees. Gets it further away from powerbox and allows me to fully straighten out one of the two monopole aerials.

A 251 95
B 597 165
L 119 7
R 170 197
F 10 0
H 0 0

So even though the position of the left reciever hasnt changed, its number of dropped info has significantly fallen.
Secondly, rotating or straightening out the main reciever away from the powerbox has dropped the numbers again
Finally 0 dropped frames for this flight. Im obviously going in the right direction.

Thanks for all the suggestions guys, especailly dribbe.

RE: Spektrum DM9 systems
 

Looks like progress... Glad it is working!

RE: Spektrum DM9 systems
 

we just maidened our new flash with a AR9000 on board

L in the tail R in the front

receiver in the middle

perfect...

@dave this is reall funny to fly , makes others look like a foamy :D:D:D

RE: Spektrum DM9 systems
 

Reciever 'R', Reciever 'L', Main reciever ? How many recievers does this thing have ? 3 ? Can you, or do you, have to buy the 3rd reciever ? Does it come with 3 recievers. Am i confused ? Yes ! Extention leads for recievers ? Can someone explain the above please ? Cheers. Ray.

RE: Spektrum DM9 systems
 

ok the AR9000 comes standard with one extra "satelite" receiver ,you can plug this in on the side of it
this has a lead of about 10cm.
optionaly you can plugin a second "satelite"receiver

the term L comes from the left out on the AR9000 and the R comes from the right side out of the reciever.

now for me to get full reception i listened to some people here on rc universe,to not mount them near fluids or carbon or anything that could be of influence.
that is why i extended both the Satelite leads so that i have one of them in the tail
and one of them in the nose
and the main receiver in the middle on and about...

RE: Spektrum DM9 systems
 

Hi,

Glad to see you guys are having good success!
(Please read the entire thread if you do not understand... you can find a lot of info)

I would encourage all to used the longer extension leads on the 'remote rx's'. Path diversity (different lines of site) is a good thing IMHO. It just makes it harder to degrade the signal with thins like the turbine and tail pipe's and carbon and so forth.

Have Fun,
David