What is the definition of a telemetry system? I've seen that term a lot while I've been shopping for modules. I don't know what your application is, but I was looking at the $27 Laipac module until I realized that they sell two versions; a base and a remote, and that multiple remote units can't talk directly to one another. Neither can multiple base units. However, a base can talk to multiple remote units in full-duplex, and a remote can talk to multiple base units in full duplex. I can think of lots of applications where this would be perfect, but mine isn't one of them. Greg On Tue, 14 May 2002, Michael Luvara wrote: > I'm currently looking at the Laipac modules and a bunch of others for a telemetry system. I've been around the block on searching and laipac definitely has the cheapest units for what they will bring. The 1200' range and size of the unit is very attractive. However, at initial glance, they do not have a lot of documentation on the web. I was sent the datasheet for the 900MHz 27$ module yesterday and it was really brief. I am very temped to order them and give it a shot. The other option was Linx modules which have a lot of support and documentation, including example applications. > > Anyone used Laipac's 900MHz modules? > > Regards, > Michael > > > [Original Message] > > From: G Brigley > > To: > > Date: 5/13/02 10:21:52 AM > > Subject: Re: [EE]: RF modules > > > > 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.... > > > > > > -- > http://www.piclist.com hint: The PICList is archived three different > ways. See http://www.piclist.com/#archives for details. > > -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.