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HelicopterRadio - Spektrum DSM › DSMX Sat missing 1 whisker - is that a problem?
08-21-2014 08:17 PM  3 years agoPost 1
ticedoff8

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Morgan Hill, CA. USA

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I had to do some maintenance on my 600N last night and I removed the DSMX sat that was attached to rear frame.

When I went back to mount the sat, I saw one of the whiskers in now missing. The other whisker is still attached.

The sat binds and lights up okay, and there are no error messages coming from the DX9

It is mounted at the back of the heli on the tailboom - away from any CF obstructions to block a signal.

Long term - I will replace the sat. I need to buy 2 more anyway

I have 2 DSMX sats hooked to my Skookum FBL controller.

Can I fly like this for a while until I get the replacement sat?

Or, should I stay grounded for a while?

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08-24-2014 09:23 AM  3 years agoPost 2
lightningrc

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UK

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No don't fly !!
If you can get same wire or wire off an old one then it's an easy repair to solder back on board .
In the early days this was a big problem but then they altered the cases to prevent the wire snapping off , we used to put a little epoxy around where the wires came out , was a good fix .

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08-24-2014 12:02 PM  3 years agoPost 3
Pistol Pete

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Seffner, FL

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Given you have two sats, I would fly it. Of course, do a range check and as you have a DX9, you can program alerts for such...just in case.

~~Enjoying the hobby one flight at a time~~

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08-24-2014 02:03 PM  3 years agoPost 4
dkshema

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Cedar Rapids, IA

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Hey, a flat tire on your car is only flat on the bottom. You'd continue to drive on it, wouldn't you?

The two wires each serve a purpose. Fix it.

The good news is that the wire itself is nothing special. If you can find similar wire, cut a piece the same length as the other and solder it on the pad of the missing one.

Or send it for repair and most likely you'll simply get a new replacement from Horizon.

If you aren't protecting those wires using heat shrink or small diameter fuel tubing, now would be the time to start.

-----
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* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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08-24-2014 05:32 PM  3 years agoPost 5
lightningrc

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UK

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Yes if you have ever flown with the park flyer sat which is just one sat you , would not fly it .
The reason you fit two at a minimum and at opposite angles is because of the way it recieves it's signals .
I've seen many crash and lose control just flying with one sat .
Fix it

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08-25-2014 12:37 AM  3 years agoPost 6
Retired2011

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Lee's Summit, MO

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As I understand it, he still has two sats, but one is missing a whisker.
I'd fly it until I could repair/replace it, but I'm kind of reckless sometimes.

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08-25-2014 12:54 AM  3 years agoPost 7
dkshema

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Cedar Rapids, IA

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Two satellites, hooked to a Skookum FBL controller. Since the Skookum has NO ability to act as a receiver of ANY kind, he has two satellites. One missing half of its antenna circuitry.

I'm not as reckless as others, and don't recommend continuing to fly in that configuration.

As noted, the wire itself is not special, it is not a coaxial cable, it is a simple single conductor stranded wire of a specific length. Easily replaced, and if soldering isn't in his bag of tricks, Horizon would most likely simply replace it with a new receiver at no cost. That's much cheaper than rebuilding a 600.

-----
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Team Heliproz

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08-25-2014 01:10 AM  3 years agoPost 8
Retired2011

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Lee's Summit, MO

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OK, so he still has 3/4 of his antennae capacity, I'd go with it...
but I wouldn't recommend it for the weak of heart.

I would recommend following Dave's advice!

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08-25-2014 07:47 AM  3 years agoPost 9
lightningrc

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UK

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Hmm lol
No body has mentioned wat if it loses signal and hits some one !
Possibly if you noticed it at the field then yes I would probably just keep it close .
But there's no way I would take it out with out repairing it , that's just stupid

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08-25-2014 10:47 PM  3 years agoPost 10
ticedoff8

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Morgan Hill, CA. USA

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I ordered a new on and it arrived on Saturday.

Just checking.

Believe 1/2 of what you see and none of what you hear.
Fake News will be the downfall of our Republic!

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08-26-2014 12:21 AM  3 years agoPost 11
Retired2011

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Lee's Summit, MO

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No body has mentioned wat if it loses signal and hits some one !
Possibly if you noticed it at the field then yes I would probably just keep it close .
But there's no way I would take it out with out repairing it , that's just stupid
Oh geez, what a comment, you can loose signal with any setup at any time...usually you just get an antennae switch.

So maybe you shouldn't be stupid and fly your heli ever!

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09-06-2014 10:19 AM  3 years agoPost 12
lightningrc

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UK

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Why is that a stupid comment !!
Y knowingly would you put people at risk if Heli not 100%
More like a stupid answer !

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10-03-2014 02:00 AM  3 years agoPost 13
EEngineer

rrProfessor

TX

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At best, the satellite RX missing a whisker has it's range reduced by 1/2.

The theoretical gain of a monopole antenna is 1/2 the gain of a dipole.

FWIW

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10-03-2014 02:28 AM  3 years agoPost 14
Retired2011

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Lee's Summit, MO

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Yes, but it is only one of two or more satellites, the FBL will switch to another satellite if the signal is not sufficient.

I just don't see anything unsafe about it...especially considering all of the other things that can go wrong with a heli or the pilot!

Not saying I wouldn't repair it, but I wouldn't quit flying because of it either.

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10-03-2014 02:55 AM  3 years agoPost 15
rcflyerheli

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Granbury, TX USA

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Yes, but it is only one of two or more satellites, the FBL will switch to another satellite if the signal is not sufficient.

I just don't see anything unsafe about it...especially considering all of the other things that can go wrong with a heli or the pilot!

Not saying I wouldn't repair it, but I wouldn't quit flying because of it either.
Chet, I have to disagree with you on this one. It doesn't make sense to fly with a known defect. It's just not worth the risk of a lost heli or an injury to yourself or someone else. This is just a hobby, not a mandatory life event.

Goblin 700, Trex 700DFC, Gaui X7, Logo 690SX, Logo 600SX; Trex 470 Trex 500
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10-03-2014 03:08 AM  3 years agoPost 16
Retired2011

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Lee's Summit, MO

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That's fine, I don't expect everyone to agree...

Have you ever checked your logs to see how many antenna switches occur during any normal flight?

I just regularly see many more important things to worry about, as far as safety goes.

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10-03-2014 03:14 AM  3 years agoPost 17
Al Austria

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Gainesville, FL

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Yes, but it is only one of two or more satellites, the FBL will switch to another satellite if the signal is not sufficient.
I just don't see anything unsafe about it...especially considering all of the other things that can go wrong with a heli or the pilot!
Not saying I wouldn't repair it, but I wouldn't quit flying because of it either.
Some pretty bad advice, reader beware...

Spektrum satellites are dipole antennas, one conductor is the driven (active)element, the other is connected to the ground plane. The only advice anyone should adhere to is grounding the bird until the Rx is repaired or replaced, period.

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10-03-2014 03:20 AM  3 years agoPost 18
Retired2011

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Lee's Summit, MO

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Some pretty bad advice, reader beware...
So you say.

It still has at least two satellites, only one of which is limited, not totally disabled.
The controller will still switch to the satellite with the best signal.

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10-04-2014 01:42 AM  3 years agoPost 19
EEngineer

rrProfessor

TX

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"Spektrum satellites are dipole antennas, one conductor is the driven (active)element, the other is connected to the ground plane."

This is incorrect.

On the radio IC, CYRF69103, there are two RF antenna pins.

If you take one apart this can be verified.

Also, the manufacturer's data sheet specifically shows this.

But, I wouldn't fly with a satellite missing a whisker.

FWIW

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10-04-2014 09:24 PM  3 years agoPost 20
dkshema

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Cedar Rapids, IA

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Of course, my car with a flat tire still has 75% of its tires intact.

Not sure I'd DRIVE it, however.

From another E Engineer.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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HelicopterRadio - Spektrum DSM › DSMX Sat missing 1 whisker - is that a problem?
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