You need to know if the signal is analog or digital, the
required S/N ratio or error rate.

For a short distance like this a parabolic antenna
may be an overkill.

"Seek and ye shall find..."  

<nbucska@pcperipherals.com>

2.400 to 2.485 GHz is an ISM band, so it's license free. The equipment you need will depend on the purpose and interfaces you need, but you can look at www.wavewireless.com for some options.
If you don't have technical expertise in link design they will help you with it.

RA

Suggestion: Visit
http://www.telefonijars.com/wireless.htm
http://www.bbwexchange.com/news/2002/jun/cirronet062502.asp
etc. for more info

a source of the allocated frequencies:
http://www.fcc.gov/oet/spectrum/table/fcctable.pdf

Otherwise, you obviously need a TX, antenna system and RX. ITs useful to know the purpose, but for microwave equipmen, do an internet search on "microwave compnonents", e.g. Watkins Johnson is an older (still in business?) microwave house

You need to be more specific/clear with your requirement.

"need to transmit a signal" -- any transmitter that can tune to 2.4 - 2.5Ghz can do that.  Will it serve any purpose or be useful?  now that's the question.

"range of 1 mile" -- one mile through space, through fog, clouds, rain, sleet, snow.  Through trees, shrubs, buildings, people, cars, trucks, concrete...???

And based on your handle--are you in the UK?

Do you want to do this for less than a specific amount of currency?

Nevertheless, here is a likely solution:

You want to transmit data, likely at a decent throughput, over a clear radio line of sight distance of one mile.  (Trees, and virtually everything else mentioned to various degrees, will distort your signal and either degrade throughput or make the radio link altogether unusable).

There are a huge number of solutions that are not very expensive in the 2.4GHz, unlicensed, ISM frequency band.  Most utilize the 802.11b protocol (or are backward compatible with it).

Some popular manufacturers are:

http://www.netgear.com/
http://www.proxim.com/
http://www.alvarion.com/
http://www.linksys.com/


Some good sources for this type of equipment are:
http://www.demarctech.com/
http://www.ecost.com/
http://www.teletronics.com/
http://www.ydi.com/

Most all of those sites have tips, primers and other documents to help you define your needs.

If clutter (trees, buildings, etc.) ARE an issue, your best bet at this time is the 900Mhz gear from http://www.waverider.com or in a few weeks, Alvarion is planning to introduce their 900Mhz OFDM product.

Hope this helps you a little.

Maddog:

Please go to www.radiolinx.com for more assistance. 2.4 GHz is in the ISM band and is license-free but requires specific country approvals. RadioLinx Products have been approved internationally.

You will want to discuss the data packeting (ie, Ethernet or serial end device connection and protocol) you wish to transmit over air. Security will be a concern, so encryption methodology should be reviewed. RadioLinx products are industrialized and very secure.

WJG ProSoft Technology