RF FM txtmtr design book, web links ?

[Peter_purple]

hi theres

anyone suggest a good book or dare i say it web link for designing an
fm transmitter to 1W for 140 to 150MHz band FM with FSK to run
off a 12v dc supply with minimal discrete components ?

i should add that there is a micro in a design project and it has spare
a/d, b/w and i/o for any sort of txmitter support,

peter purple potency

 

[Peter Parker]

"Peter_purple" <purple@203.0.178.192> wrote in message
news:3FDCDFD4.CEA7640@203.0.178.192...

hi theres

anyone suggest a good book or dare i say it web link for designing an
fm transmitter to 1W for 140 to 150MHz band FM with FSK to run
off a 12v dc supply with minimal discrete components ?

There is an amateur radio band between 144-148 MHz so you will find circuits
in old ARRL Handbooks (up to the mid-70s). But they are crystal controlled,
use a large number of discrete parts and can be a pain to align.

There are chips like the MC2831 that have a lot of the electronics in them.
But they are low power and require several multiplier/amplifier stages
after.

Or you could use an ex-commercial radio for 20-25w out.

Note that you will need an amateur licence to operate 144-148 MHz - see
www.wia.org.au for details.

Peter

 

[Roger Lascelles]

Texas Instruments among others have chips which let you put digital in and
get RF out on frequency. The app notes tell you planty. I don't know if
they have something right on your frequency range.

Roger



"Peter_purple" <purple@203.0.178.192> wrote in message
news:3FDCDFD4.CEA7640@203.0.178.192...

hi theres

anyone suggest a good book or dare i say it web link for designing an
fm transmitter to 1W for 140 to 150MHz band FM with FSK to run
off a 12v dc supply with minimal discrete components ?

i should add that there is a micro in a design project and it has spare
a/d, b/w and i/o for any sort of txmitter support,

peter purple potency

 

[Mike Harding]

On Mon, 15 Dec 2003 21:22:44 +1100, "Roger Lascelles"
<r.o.g.e.r.l.a.s.@optusnet.com.au.removedots> wrote:

Texas Instruments among others have chips which let you put digital in and
get RF out on frequency. The app notes tell you planty.

They do? Can you give us any pointers?

Mike Harding