Original question at end:

I'd ensure that antennae at TX and RX are as good as could be before adding
gain.

Taking RF  from MTC-01output means you get the benefit of whatever
filtering and tank cct they provide. Which may range from none provided to
useful.

They say < 10 mW output.

Max 2644 output is around 50 mW input max at Vcc =3D 5V,.
Output is about +6 dBm max (fig top left page 4) or about 4 mW (!)

Either the MTC-01 is making << 10 mW or the Max2644 is not going to help
you vastly.
Odds are the RF level is much lower than 10 mW as with a hald decent aerial
and sensible receiver 10 mW can get you vastly further than that.

The MTC RF MAY need attenuating to present input overload if power is as
high as it might be, but probably not. You may be able to link couple to
the output tank (if it exists) which allows any degree of attenuation
desired by moving relative coil positions.

RF entails substantial arcanery and what looks like 6 components on a PCB
MAY have taken somebody months to arrive at. Even a reference design with a
PCB layout and clear directions may not translate as cleanly as you'd
expect (or hope) into real world practice.  It's likely that for minimal
cost you can find completed amplifier modules which also have specs for
input and output impedances and levels.

Others are most welcome to point out anything above which seems or is
incorrect or less useful than something they can add..




         Russell



> > Hi all, I've recently been getting into RC
> > helicopters/bicopters/quadrocopters. One of my helicopters requires an
> > MTC-01 (
> >
> https://www.hobbyking.com/hobbyking/store/__38130__Walkera_RC_Magic_Cube_=
MTC_01_Devention_Transmitter_Module_for_WK_Android.html
> )
> > transmitter module which takes an output signal from the control stick
> > inputs and outputs an RF signal that is compatible with the receiver.
> > However, the transmitter module's RF output power is very low and the
> > effective range is < 10m.
> >
> > Is there a way to easily amplify the RF signal? I have no experience
> > making RF circuits. But can it be as simple as dropping in a MAX2644 (
> > http://www.maximintegrated.com/datasheet/index.mvp/id/2357) to amplify
> > the signal?
> >
> > Where should the output signal from the transmitter module be taken (to
> be
> > fed into the amplifier)? At the antenna?
--=20
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