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Old May 08, 2011, 05:45 AM
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Daemon's Avatar
Lakewood, Colorado
Joined Aug 2002
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Quote:
Originally Posted by arnaldo26 View Post
can fox 800 without filter induce failsafe on our dsss 2,4ghz(assan)?
Yes, absolutely. 1.2-1.3Ghz video Tx's spew 2nd order harmonics directly into the
2.4Ghz band. It doesn't matter what 2.4Ghz Rx you use, they will all be
negatively affected to pretty much the same degree. You *must* use a low pass or notch filter to block
the harmonics at the video tx side.

ian
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Old May 08, 2011, 06:29 AM
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Italia, Emilia Romagna, Modena
Joined Mar 2009
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Quote:
Originally Posted by Daemon View Post
Yes, absolutely. 1.2-1.3Ghz video Tx's spew 2nd order harmonics directly into the
2.4Ghz band. It doesn't matter what 2.4Ghz Rx you use, they will all be
negatively affected to pretty much the same degree. You *must* use a low pass or notch filter to block
the harmonics at the video tx side.

ian
ok but notch filter works only for one channel?
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Old May 08, 2011, 08:43 AM
Ikaruswannab
Joined Sep 2009
978 Posts
Quote:
Originally Posted by Daemon View Post
Yes, absolutely. 1.2-1.3Ghz video Tx's spew 2nd order harmonics directly into the
2.4Ghz band. It doesn't matter what 2.4Ghz Rx you use, they will all be
negatively affected to pretty much the same degree. You *must* use a low pass or notch filter to block
the harmonics at the video tx side.

ian
I am using Fox-800 with stock antenna on my SlowStick with Corona 2,4GHz receiver running from one battery and have been out to 1Km without a glitch.
soon i will be trying to go further.
Teo
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Old May 08, 2011, 10:57 AM
RC pilot by soul
Israel
Joined Apr 2005
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Quote:
Originally Posted by teopbako View Post
I am using Fox-800 with stock antenna on my SlowStick with Corona 2,4GHz receiver running from one battery and have been out to 1Km without a glitch.
soon i will be trying to go further.
Teo
with which 2.4ghz system ?
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Old May 08, 2011, 11:20 AM
Ikaruswannab
Joined Sep 2009
978 Posts
An old Graupner MX-12 that i have moded to 2.4GHz with the
Corona DIY DSSS V2 system

http://www.hobbyking.com/hobbyking/s...idProduct=9770

Teo
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Old May 08, 2011, 11:22 AM
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Italia, Emilia Romagna, Modena
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Quote:
Originally Posted by teopbako View Post
An old Graupner MX-12 that i have moded to 2.4GHz with the
Corona DIY DSSS V2 system

http://www.hobbyking.com/hobbyking/s...idProduct=9770

Teo
my quad with channel 6 and assan 2,4 crashed at about 100metres
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Old May 08, 2011, 01:23 PM
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Lakewood, Colorado
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Quote:
Originally Posted by arnaldo26 View Post
ok but notch filter works only for one channel?
No. A notch filter is call that, because it passes all frequencies except for those
in the notch. The OMM notch filter has two notches which they set in the middle of 2.4Ghz
band (for 2.4Ghz control) and 1.5Ghz (for GPS). It acts the same regardless of channel.
Note that some receivers (FrSky for one) are directly influenced by lower frequencies (900Mhz)
and for those neither the low pass or notch filter are useful.

Quote:
Originally Posted by teopbako View Post
I am using Fox-800 with stock antenna on my SlowStick with Corona 2,4GHz receiver running from one battery and have been out to 1Km without a glitch.
soon i will be trying to go further.
Teo
1km is not very far. Whatever range you can achieve without the filter, could
be more than doubled with it.

ian
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Old May 08, 2011, 02:08 PM
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Italia, Emilia Romagna, Modena
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Quote:
Originally Posted by Daemon View Post
No. A notch filter is call that, because it passes all frequencies except for those
in the notch. The OMM notch filter has two notches which they set in the middle of 2.4Ghz
band (for 2.4Ghz control) and 1.5Ghz (for GPS). It acts the same regardless of channel.
Note that some receivers (FrSky for one) are directly influenced by lower frequencies (900Mhz)
and for those neither the low pass or notch filter are useful.


1km is not very far. Whatever range you can achieve without the filter, could
be more than doubled with it.

ian
ofr my assan i think i will buy lpf from dpcav...
what channel i have to use? 5 is good?
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Old May 08, 2011, 02:11 PM
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I use ch9 (1280Mhz) because that's the legal one, and does not fall in
the band reserved for aeronautical navigation (ILS/MLS/DME control frequencies
used by commercial aircraft) as ch5 does.

ian
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Old May 08, 2011, 02:16 PM
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Italia, Emilia Romagna, Modena
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Quote:
Originally Posted by Daemon View Post
I use ch9 (1280Mhz) because that's the legal one, and does not fall in
the band reserved for aeronautical navigation (ILS/MLS/DME control frequencies
used by commercial aircraft) as ch5 does.

ian
ok...but i'm not american so what channel is the best for 2,4rx with lpf?

can i power the vtx with the same lipo of quadcopter? what i have to use?
thank you!
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Old May 08, 2011, 02:30 PM
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Lakewood, Colorado
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DME/P control frequencies are the same world-wide, thus flying in that band
is pretty much not legal anywhere.
Beyond that, if you use the low pass or notch filter, it shouldn't
matter what channel you choose.

ian
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Old May 08, 2011, 02:33 PM
Registered User
Italia, Emilia Romagna, Modena
Joined Mar 2009
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Quote:
Originally Posted by Daemon View Post
DME/P control frequencies are the same world-wide, thus flying in that band
is pretty much not legal anywhere.
Beyond that, if you use the low pass or notch filter, it shouldn't
matter what channel you choose.

ian
ok thank you...
can i power the vtx with the same lipo of quadcopter? it makes any interference?
thank you!
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Old May 08, 2011, 02:56 PM
RC = FUN
Fort Wayne, Indiana
Joined Aug 2008
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So would you reccomend the Fox800 or the 1.2 700mw one from ReadymadeRc?

I could go either way, I just want the best performance. -Tyler
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Old May 08, 2011, 03:08 PM
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Wielka Brytania, Anglia, Derbyshire
Joined Jan 2011
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hi. i looking for Vrx with will work with this Vtx
http://www.lowpricerc.com/product_in...roducts_id=986

how know where i can get one ? Frequency: 1080.1120.1160.1200
Thanks
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Old May 08, 2011, 04:12 PM
Ikaruswannab
Joined Sep 2009
978 Posts
Quote:
Originally Posted by flyboy321 View Post
So would you reccomend the Fox800 or the 1.2 700mw one from ReadymadeRc?

I could go either way, I just want the best performance. -Tyler
I only have tested Fox-800 and i have to say that i have been very lucky.
I use the HK cam that has on its back the Fox-800 VTx hot glued!.
All running from one battery on 1280MHz in conjunction with 2,4GHz RC and have been to 1Km without one glitch and i mean it, not one!.
And i have to say that i wasn't flying in a str8 line.
For me is the way to go on 1280MHz if u r in a low budget.
I'll be getting a second one soon to create a diversity system.
Teo
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