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Choosing RF tranceiver. please help

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ohmelx

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can anyone please help me in choosing an RF Tranceiver.

specs.
-ISM Band ( 900Mhz)
-Spread spectrum

can someone please help me find this..
im having a hard time searching in the net.
 

hi.
for chossing RF transceiver i think u should study ANTENNA DESIGN by BALANIS.
hop u find something better and of ur interest.
 

vfone said:
h**p://www.lsr.com/xeti900.pdf
Click to expand...

hi is this module enough?

planning to use a transceiver with a PIC micro for the data

or an IC transceiver is enough?

sorry not familiar with the modules etc...
 

Very good RF Transceiver module: **broken link removed**
 

electronicus said:
Very good RF Transceiver module: h**p://www.lprs.co.uk/main/index.php
Click to expand...

uhm... what does those modules offeR?

im planning to interface the transceiver with a PIC micro...

do i need the transceiver module or just an IC?
 

Hi, I would go for an Analog devices device ADF7020 series. Cheap (1.50 USD @ 100 pcs) very few external components (should have a look) and easy to use. Complete digital radio technology with digital filtering and demodulation. Can do FSK/GFSK/GMSK, OOK, ASK, GOOK etc....

Super chip.

Paul.

I would select frequency hopping since ihis is the easest way to implement spread spectrum.
 

But FHSS disturbs the narrow band devices, but if it's not a standpoint then FHSS is OK.
 

HI, I don't agree with you. FHSS is having the same effect in time as DSSS for narrow band receivers. FHSS is more simple to implement and much better for low power devices since its PA can work more efficently.

Paul.
 

I don't think that FHSS is having the same effect as DSSS for narrow band receivers.

Think of it!

FHSS is frequency hoping. And if the frequency hope to some frequency when there's a narrow band receiver in frequency, then it will disturb the narrow band receiver.
FHSS has the wide spectrum just in the average. In a moment FHSS is a narrow band system.
DSSS always has a spread spectrum (in every moment)

Essence : DSSS disturb a narrow band receiver as a bit mess the SNR

The FHSS disturbs a narrow band receiver as some seconds blocking the receiver.

Imagine if you watch the television!
If sombody use a DSSS system in the TV band, you have a little bit worse SNR, so the TV screem will be a little bit worse but supportable.

If somebody distrurbs the TV band with a FHSS system then you will be very angry, because for example in every 10 seconds you won't catch the TV programme.
 

we need the transceiver for a wireless door lock application.... so FHSS would be enough,

would the spread spectrum be available at once? or do we need to program the transceiver for this?
 

i also need some help.i need to make a remote for a range of abt say 1 km.ask.fsk transceivers will do.but i also need very few external components specially no inductors.plz help
 

Dear,

Check Chipcon Site.From CC1000 series,they are easy to use,some of them

have an integrated 8051 compatible microcontroller.

an other option:

Check micrel site.They have some tranceiver chips or (a Transmitter chip & compatible receiver chip)

that only needs a clock (or crystal) with a few other components and no inductor. (usually using ask)

Good Luck.
 

see www.microlinear.com for FHSS,DSSS chips:
The ML2724 is a fully integrated 2.4GHz Low IF transceiver. It can be used to implement both direct sequence (DSSS) and frequency hopping (FHSS) spread spectrum modulation, allowing our customers' products to "cut through" interference in the crowded 2.4GHz ISM band. The ML2724 can be used to implement 1.5Mbps communication links in systems complying with the new wideband FCC Regulation Part 15.247. The ML2724 has been designed into digital cordless telephones (DCT), wireless game controllers, and many other wireless consumer products.
 

anyone familiar with the FHSS? do we need to program the transceiver? or will the FHSS work at once?
 

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