digital and analog video downlink provider

The best product I found :

http://www.rotoconcept.com/products/digitalrfvideotransmitters/rq3highpowernlosvideolink/

http://navtech.newcomweb.demon.com/downloads/index.htm

Technology from 2005. Probably expensive compared to today's standards.

Still interesting to see how digital downlink is achieved.. here, it seems they are using COFDM modulation and they provide receiver and transmitter. But I beleive it must be very heavy....

Other provider of COFDM receiver/transmitter :
http://www.alibaba.com/showroom/uav-transmitter.html
http://www.alibaba.com/product-gs/513686401/Cute_Mini_COFDM_Transmitter_and_Receiver.html
http://www.alibaba.com/product-gs/261883052/MV2025TTSE_Mini_Wireless_COFDM_Transmitter.html
http://www.alibaba.com/product-gs/379850065/COFDM_Wireless_Digital_Transmitter_for_UAV.html


Great provider all in one and compact :

http://www.discover-cctv.com.sg/professional-cctv/digital-wireless-transmission

Specifications: 

Model Number	DIS-W1100/PN5	DIS-W1100/CN5	DIS-W1100/AN5
CPU	Atheros MIPS 24KC, 400MHz
EMS memory	32MB		64MB
Flash memory	8MB
Working frequency	5.470GHz~5.825GHz (IEEE802.11a/n)	5.150GHz~5.825GHz (IEEE802.11a/n)	5.470GHz~5.825GHz (IEEE802.11a/n)
Antenna connector	N type, Male (connect to the antenna directly)	-	2 x RP-SMA
Transmitting power output	Max. 400mW	Max. 500mW	Max. 500mW
Transmitting distance (LOS)	>50km	>15km	>50km
Transmitting speed	Max. 100Mbps TCP/IP	Max. 150Mbps TCP/IP
Channel bandwidth	40MHz, 20MHz, 10MHz & 5MHz (adjustable by PC program)
Network connector	1 x 10/100M Ethernet (RJ-45)	2 x 10/100M Ethernet (RJ-45)	1 x 10/100M Ethernet (RJ-45)
Appearance	Industrial grade outdoors type UV
Antenna	External	Integrated 2x2 MIMO dual-polarized intelligent antenna	External
Shell structure	Anti-corrosive, waterproof & sun-proof
Shell strength	ETSI300-019-1.4
Power	24V, Power-over-Internet (PoE)	15V, Power-over-Internet (PoE)	24V, Power-over-Internet (PoE)
Power consumption	6W	8W	6W
Working temperature	-40°C ~ 80°C	-30°C ~ 80°C
Working humidity	5% ~ 95% (non-condensing)
Dimension	15.2 x 3.1 x 3.7cm	29.4 x 8 x 3cm	16 x 8 x 3cm
Weight	0.18kg	0.4kg	0.5kg
Standard Certification	FCC Part 15.247, IC RS210, CE
RoHS	Compliant

Ordering Information: 

Please refers to above Specifications' Model Number

Autre solution :

http://wirelessvideocameras.com/my-cart.html?page=shop.product_details&flypage=flypage.tpl&product_id=7&category_id=53

5.8GHz 1 Watt Airborne Video Downlink (No Camera)

Includes:

5.8Ghz 1 Watt Transmitter with 12VDC to 24VDC input

5.8Ghz Receiver with 9VDC to 12VDC input

1  "rubber duck type" Omni-Directional Antenna for TX

1  Patch Directional Antenna for TX

1  9dBi High Gain Omni-Directional Antenna for TX for extended range and signal strength

1  High Gain 23dBi Directional Antenna Enclosure with Integrated 5.8Ghz Receiver & 30ft. cables

AC/12VDC power supply for RX and Instructions

Features:

Transmitter Weight only 4 ounces (113 grams)

Plug & Play system just add any composite video camera for TX and any TV for RX
High Quality Real-Time Wireless Video up to 25mile Clear-Line-of-Sight Range
Great for all types of Airborne RC & UAV applications, Airplanes, Helicopters, Blimps & more

5.8Ghz will not interfere with 2.4Ghz RC radio-control units

SMA connectors for TX & RX for use of Omni-Directional or Directional Antennas

23dBi High Gain Directional Antenna Enclosure with Integrated 5.8ghz Receiver & 30ft. Video, Audio & Power cables

11 degree Horizontal and 11 degree Verticle Antenna Signal Beamwidth for the Receiver Anetnna

Pole Mount bracket for Receiver Antenna Enclosure to raise off the ground for increased range

One-Year Warranty

Life-Time Free Technical Support to original purchasing customer

Solutions en COFDM

WVC-SD Digital COFDM Mini Transmitter System

COFDM Digital Wireless Video Mini Transmitter with True Diversity Receiver - Excellent choice for UAV and Body Worn applications - Credit Card sized Mini COFDM Transmitter
[Product Details...]

Our Price: Call for Pricing

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WVC-SD Digital COFDM Wireless Video System

COFDM Digital Wireless Video Transmitter & True Diversity Receiver - Available for Long Range Line-of-Sight and Urban Non-Line-of-Sight applications
[Product Details...]

Our Price: Call for Pricing