Brown out/signal loss to dsmx sats

[moggyp18]

Just throwing this out there as i am all out of options as to what is the issue.

I am using a mini v bar on a trex 450l and it is suffering from browning out/signal loss issues on the 2 dsmx sats, at first i thought it was possibly a dodgy sat lead so i replaced them both and was still the same, next was bec issues/failure in the align standard esc which comes with the combo kit so replaced with a yep 60a and guess what still the same. I then looked at all the motor wires servo leads etc and all was good here and even checked battery ec3's and all was to be expected ok here, i then tried a re-bind and yes still the same, so my only other thought is that can the mini v-bar have a fault ?????????

all help on this would very much appreciated as i am at a bit of a loss as to what i can try next to resolve the issue.

cheers

mick p

[Raving Jim]

Where are your sats mounted on the heli?

[moggyp18]

I have 1 mounted on the side frame with the dsmx logo the right way up with left antenna left and right is to the right, and the other is on the rear tail case looking from above with heli nose in the sat is left antenna left and right is to the right.

hope you understand what i mean.

[dw45]

I gather you have read this for sat placement. http://www.rcheliaddict.co.uk/spektr...important.html

[Raving Jim]

Are the antennas in full view , ie fresh air an not against the carbon side frame .

[Raptormad2]

Hi i dont know if its the same on the dx7 tx but on my dx8 i have to change the the frame rate to 11ms when
Using dsmx sats and on the vbar setup menu to dsmx sats.

[moggyp18]

Cheers for this guys ! no i had not seen the info on rx placement post before but i have now. Yes they are in fresh air but having read the info on placement not as much as i would of thought necessary so i will be looking at placement tomorrow, i am no longer using a dx7se and am now using a dx9 and i have it on 11ms frame rate. these 450 are just too dam small for electric placement lol

[kenny d]

I've got 4 450's on microbeast (which does not have a built in receiver)with only one sat , I've flown them till there a dot in the sky & never lost signal

[Coxy]

Cheers for this guys ! no i had not seen the info on rx placement post before but i have now. Yes they are in fresh air but having read the info on placement not as much as i would of thought necessary so i will be looking at placement tomorrow, i am no longer using a dx7se and am now using a dx9 and i have it on 11ms frame rate. these 450 are just too dam small for electric placement lol

Let us know how you get on with the alternative Siting.. I have just purchased the dmsx Sat with the longer Ariel for carbon side frames, so will see if it makes a difference. Have posted previously ref signal loss to Sat, so will also reposition that one and change the lead to it..

[woodsta888]

Had some problems with shutdown on my 800 using just sats direct toFBL. OK, the FBL was a BD3SX and requires at least 5.5v power.

Also the placement of my sats even on the frames of an 800 were on the limit of 3 in.

The use of sats only via the FBL is possile as say Spektrum released theprotocol for the FBL units to be able to run it via the ports. What Spektrum do not guarantee is that the quality of the signal via sats into the FBL can be upheld.

Spektrum ETC only gave the protocol for allowance for connection via sats and should not be accepeted as a solution.

Upon fitting a full RX and the TM1000 telemetry (Just to monitor signal)I never had another shutdown in flight. Sats in my view should only be used as additional avenues (especially in larger models) to extend the available reception across receivers. Only a full reciever is warranted by any TX manufacturer and none endorse that the use of sats only on an FBL will produce the same results as a full RX. They just sold the connectivity rights.

[scallybert]

I think you need to investigate whether you're seeing brown-outs, or whether you're seeing signal loss - as they are quite different.

From the above, people seem to be thrashing about in the dark.

V-Bars log error information, so that would be a good starting point.

[Grumpy]

The story linked in the first post about only one antenna whisker on sats being 'active' is nonsense. The two whiskers are two halves of a single dipole antenna and both contribute equally to reception.

[dillwhacker]

The story linked in the first post about only one antenna whisker on sats being 'active' is nonsense. The two whiskers are two halves of a single dipole antenna and both contribute equally to reception.

Do we know this as a fact?
What about the Spektrum Ar600? - this has two thingys coming out of it. One about 1/4 wavelength long (2.5cm) of plain wire and the other co-ax about 5 inches long, before another 1/4 wavelength stub of unscreened centre conductor? Doesn't looke like a dipole? Can a dipole be assymetrical like this? Looks like two seperate antennas to me?
What about the Spektrum AR610? - this also has two thingys coming out of it. One about 1/4 wavelength long (2.5cm) of plain wire and the other co-ax about 5 inches long, with a bulge in the heatshrink (active antenna?) before another 1/4 wavelength stub of unscreened centre conductor? Doesn't looke like a dipole? Looks like an antenna and a seperate remote active antenna to me?
Just thinking.....

[Mark_T]

Yes, the satellites are a single dipole antenna, there is no doubt on that point and this is also why the two antenna are arranged in a straight line.

Other Spektrum receivers have different solutions, the AR600 has two monopole antenna. AR610 again has two monopoles. Both of these should have the antenna positioned at 90 degrees to each other.