Thanks everyone,

I hadn't heard of Laipac.  Their low-end modules are pretty competitive,
and their $27 900MHz transceivers seem pretty attractive too.

I'm not sure now which way to go.

I get the impression that the 315 and 433 MHz modules are usually used for
"Press a button, close a relay" type applications.  Maybe it's not worth
trying to coax a multipoint data network out of them, even if throughput
requirements are low.  If I did go this route, would I be able to control
a seperate receiver and transmitter with a pic, or should I be looking
only at integrated transceivers?

I might yet switch to 900MHz.  The extra range could come in handy.  And
maybe there'd be app notes more similar to what I'm doing.

Greg

On Mon, 13 May 2002, David P. Harris wrote:

> Hi-
> I have used the 433MHz pairs.  Work quite well.  They also have some 916
> MHz pairs, and some transievers. Here's their pricelist, in US$:
>
> LP link 900 931.9375Mhz POCSAG Receiver 25.00
> LP link xxx Customer made freq. 140   932Mhz POCSAG Receiver 25.00
> RF900CLP Base 900MHz Voice transceiver 40ch Base 5V 12.00
> RF900CLP Remote 900MHz Voice Transceiver 40ch Remote 3.6V 12.00
> RF900DV Base 900MHz Data & Voice Transceiver 16ch Base @28.8K 27.00
> RF900DV Remote 900MHz Data & Voice Transceiver 16ch Remote @28.8K 27.00
> RF2400DV Base 2.4Ghz Data & Voice Transceiver 16ch Base @28.8K 31.00
> RF2400DV Remote 2.4Ghz Data & Voice Transceiver 16ch Remote @28.8K 31.00
> CCD-52 w/mic + Rx Complete set of 2.4Ghz CCD w/mic, Rx video/audio, batt.
> 220.00
> CCD-52 w/o mic + Rx Complete set of 2.4Ghz CCD w/o mic,Rx
> video/audio,batt. 210.00
> CCD-52 w/mic CCD 2.4Ghz CCD color w/mic ( avail. Freq. 2412/32/52/72)
> 140.00
> CCD-51 w/mic CCD 2.4Ghz CCD color w/mic ( avail. Freq. 2412/32/52/72)
> 136.00
> TLP315 RF ASK Transmitter at 315Mhz 4.80
> TLP315A RF ASK Transmitter at 315Mhz ( Smaller ) 4.80
> TLP418 RF ASK Transmitter at 418Mhz 4.80
> TLP418A RF ASK Transmitter at 418Mhz ( Smaller ) 4.80
> TLP433.92 RF ASK Transmitter at 433.92Mhz 4.80
> TLP433.92A RF ASK Transmitter at 433.92Mhz ( Smaller ) 4.80
> TLP916-ASK RF ASK Transmitter at 916.5Mhz 7.00
> TLP916-FSK RF FSK Transmitter at 916.5Mhz 9.00
> RLP315 RF ASK Receiver at 315Mhz - LC Type 4.80
> RLP315A RF ASK Receiver at 315Mhz - SAW Type 9.50
> RLP418 RF ASK Receiver at 418Mhz - LC Type 4.80
> RLP418A RF ASK Receiver at 418Mhz - SAW Type 9.50
> RLP433.92 RF ASK Receiver at 433.92Mhz - LC Type 4.80
> RLP433.92A RF ASK Receiver at 433.92Mhz - SAW Type 9.50
> RLP916-ASK RF ASK Receiver at 916.5Mhz 13.00
> RLP916-FSK RF FSK Receiver at 916.5Mhz 14.00
> TLP4XX- 2W * RF FSK & FM Transmitter UHF 0.5 - 2 Watt 25.00
>
> David
>
> Ann & David Scott wrote:
>
> > Maybe the Laipac modules will work for you?  They're in Toronto.
> > A receiver/transmitter pair is less than $10US.  I've used these
> > with success (garage door type application).
> >
> > I'm a bit puzzled why I haven't seen more on this list about
> > these modules.  They seem to be a useful item for their low
> > cost.  Can anyone comment?
> >
> > G Brigley wrote on 5/11/02 5:04 pm:
> > >Hi,
> > >
> > >I'm designing a network of
> > >devices that uses a shared
> > >wireless medium....
> >
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