Low Power Rf Module Required, An RF Module required with low Current

Hello,

I am looking for an RF transceiver with very low current consumption. I am currently working on an RF based Automatic Meter Reading Project (AMR). We are looking for 433MHz Modules.

The modules that i have found so far have around 15-20mA Current consumption while transmitting. I am looking for a RF module with transmission current consumption less than 10mA. The required range is 100m.

My requirements are:
Frequence: 433MHz
I(transmitting) < 10mA
range>100m

I have no financial constraints in this regard. Any help will be greatly appreciated. Thank You

This post has been edited by port500 on December 22, 2010 11:44 am

Power consumption will relate to radiated power and to attain a certain distance (with a given antenna) you will require a certain power - the efficiency of the transmitter will be high anyway so there's no particular way of improving it.

It therefore follows that you will require a more efficient antenna system rather than a low power transmitter.

Improvements in front-end design (at the receiver) might help permit a lowering of power at the transmitter too. Anyway, you could always lower the transmission times (once per hour?) to conserve power.

Is power conservation your main aim?

hmmm ...
if you need 100 meter range with 10mA of current draw you will need to find a module that uses a higher voltage than most of the others .
basically :
you need a given amount of rf power to "cover" the required range .
output power of the unit can be measured in watts (or milliwatts) .
(roughly , in this case) E X I = P (watts) .

what you will be doing is exchanging a higher voltage for lowered current consumption .
--- no free lunches ---

i take it that you have calculated what the tx/rx field requirements will be ?
without knowing this you will not be able to determine what the transmitter output power requirements would be .

With lowest baud rate and lowest output power I guess you should get close to the minimum in this datasheet:

Linky.

Pretty damn sure you'll need a directional antenna to get 100m range for it, though.

Another one: 13ma

Winner.

The Module will be integrated with Energy meters and used as an AMR system. The aim right now is to find an IC/Module that uses the least amount of Power/Current, and has a minimum range of 100m. The antenna design will come at a later stage. And the requirement from the power company is to transmit meter Data once every 20 minutes.
Tx needs to be below 10mA while transmitting at sufficient power to achieve a range of 100m in an urban area

This post has been edited by port500 on December 23, 2010 05:26 am

I already found the semtech SX1240 module, and so far it is the best solution. I am looking for something even more low power than it

Given it's to be integrated with energy meters, why the reluctance to draw the power from the actual supply being measured? It's not like it would be 'chargeable' (and even if it were, the customer couldn't complain).

I can't imagine for a moment that the device will be BATTERY POWERED so why the emphasis on low power consumption?

Suggestion: supercap. Average the draw out over the inactive period.

Another option that no one has mentioned so far, to reduce transmitter current consumption and maintain 100m range, is to build a more sensitive receiver. A good quality low noise amp on the receiver front end is required.

We have decided to use the SX1240 and work on a better receiver design. Thank You for the feedback. Much Appreciated.

insert appreciation here

some people have no shame at all ...