ADF7011 433MHz transmitter

[Rene Tschaggelar]

There are these extremely simple to apply transmitter chips
such as the ADF7011, which are a 76kbit transmitters including
VCO & PLL. A few R & C and you're done. This gives me complete
transmitter on a thumbnail, just the actual microcontroller
delivering the data is to be added plus a quartz signal. 30mA
supply at 3V and it costs 4$.
Now comes the stupid part. How am I expected to receive the
signals ? Yes, I could build a PLL with a VCO, crystal, then
perhaps an AFC to lock to the frequency unless I'm hopping
the freqeuncy. Downmix to whatever and decode the bits.
It takes few hundred mA and perhaps a handsized pcb.
Or downconvert with a PLL multiplied Quartz from a DSP,
sample at few MSamples and have some code to extract the bits.

I'm somehow expecting a thumbnail sized receiver equally
trivial to build like the transmitter. No ?
Did I miss something ?

Rene
--
Ing.Buero R.Tschaggelar - http://www.ibrtses.com
& commercial newsgroups - http://www.talkto.net

 

[Tim Wescott]

Rene Tschaggelar wrote:

There are these extremely simple to apply transmitter chips
such as the ADF7011, which are a 76kbit transmitters including
VCO & PLL. A few R & C and you're done. This gives me complete
transmitter on a thumbnail, just the actual microcontroller
delivering the data is to be added plus a quartz signal. 30mA
supply at 3V and it costs 4$.
Now comes the stupid part. How am I expected to receive the
signals ? Yes, I could build a PLL with a VCO, crystal, then
perhaps an AFC to lock to the frequency unless I'm hopping
the freqeuncy. Downmix to whatever and decode the bits.
It takes few hundred mA and perhaps a handsized pcb.
Or downconvert with a PLL multiplied Quartz from a DSP,
sample at few MSamples and have some code to extract the bits.

I'm somehow expecting a thumbnail sized receiver equally
trivial to build like the transmitter. No ?
Did I miss something ?

Rene

Linear tech, Maxim, and I think ADI, have some direct-conversion
quadrature receivers that'll get you down to baseband -- decoding the
data is your job, but it should be quite doable with a DsPIC, other
small DSP, or (gasp) analog circuitry.

--

Tim Wescott
Wescott Design Services
http://www.wescottdesign.com

 

[martin griffith]

On Wed, 02 Mar 2005 22:12:07 +0100, in sci.electronics.design Rene
Tschaggelar <none@none.net> wrote:

There are these extremely simple to apply transmitter chips
such as the ADF7011, which are a 76kbit transmitters including
VCO & PLL. A few R & C and you're done. This gives me complete
transmitter on a thumbnail, just the actual microcontroller
delivering the data is to be added plus a quartz signal. 30mA
supply at 3V and it costs 4$.
Now comes the stupid part. How am I expected to receive the
signals ? Yes, I could build a PLL with a VCO, crystal, then
perhaps an AFC to lock to the frequency unless I'm hopping
the freqeuncy. Downmix to whatever and decode the bits.
It takes few hundred mA and perhaps a handsized pcb.
Or downconvert with a PLL multiplied Quartz from a DSP,
sample at few MSamples and have some code to extract the bits.

I'm somehow expecting a thumbnail sized receiver equally
trivial to build like the transmitter. No ?
Did I miss something ?

Rene
nope, AD only seem to make TX's or RX/TX

http://www.analog.com/en/prod/0%2C2877%2CADF7020%2C00.html
but no RX's
so you might need a transceiver strapped into RX mode.

Dumb eh?


martin

"An eye for an eye makes the whole world blind"
Gandhi

 

[Luhan Monat]

Rene Tschaggelar wrote:

There are these extremely simple to apply transmitter chips
such as the ADF7011, which are a 76kbit transmitters including
VCO & PLL. A few R & C and you're done. This gives me complete
transmitter on a thumbnail, just the actual microcontroller
delivering the data is to be added plus a quartz signal. 30mA
supply at 3V and it costs 4$.
Now comes the stupid part. How am I expected to receive the
signals ? Yes, I could build a PLL with a VCO, crystal, then
perhaps an AFC to lock to the frequency unless I'm hopping
the freqeuncy. Downmix to whatever and decode the bits.
It takes few hundred mA and perhaps a handsized pcb.
Or downconvert with a PLL multiplied Quartz from a DSP,
sample at few MSamples and have some code to extract the bits.

I'm somehow expecting a thumbnail sized receiver equally
trivial to build like the transmitter. No ?
Did I miss something ?

Rene

Maybe some of these...

http://www.radiotronix.com/prodsel.asp

--
Luhan Monat (luhanis 'at' yahoo 'dot' com)
"The future is not what it used to be..."
http://members.cox.net/berniekm

 

[Rene Tschaggelar]

Luhan Monat wrote:

Rene Tschaggelar wrote:

There are these extremely simple to apply transmitter chips
such as the ADF7011, which are a 76kbit transmitters including
VCO & PLL. A few R & C and you're done. This gives me complete
transmitter on a thumbnail, just the actual microcontroller
delivering the data is to be added plus a quartz signal. 30mA
supply at 3V and it costs 4$.
Now comes the stupid part. How am I expected to receive the
signals ? Yes, I could build a PLL with a VCO, crystal, then
perhaps an AFC to lock to the frequency unless I'm hopping
the freqeuncy. Downmix to whatever and decode the bits.
It takes few hundred mA and perhaps a handsized pcb.
Or downconvert with a PLL multiplied Quartz from a DSP,
sample at few MSamples and have some code to extract the bits.

I'm somehow expecting a thumbnail sized receiver equally
trivial to build like the transmitter. No ?
Did I miss something ?

Rene


Maybe some of these...

http://www.radiotronix.com/prodsel.asp

Thanks.
the receivers are rather slow with 4800 baud.

Rene