• Graupner MX-20. Supports a lot of channels. Allows to mix multiple receivers. Great for FPV and multiwiicopter. ppm. Expensive >400
• Futaba has 12 channel systems or more. ppm. Very expensive >500
• Hitec Aurora 9. 9 channels. Supports telemetry. ppm. 391
• Turnigy 9x. 8 channels. No ppm with included receiver. Transmiter has internal ppm. Open source firmware. Extremely cheap! ~ 50

• Using included receiver and a ppm module we can control multiwiicopter. ~ 25
• Replacing receiver with frfly system. Telemetry. Supports multiple receivers but not at the same time (http://www.frsky-rc.com/uploadfile/201009/20100930115814373.pdf). Clame 1.5Km range. (look in hobby king. http://www.rcgroups.com/forums/showthread.php?t=1408118&page=2). ~ 100
• FrSky. PPM!! 4-channel has 8 ppm channels. http://www.multiwii.com/forum/viewtopic.php?f=16&t=944
• FrSky. d8r-II with cppm: http://www.youtube.com/watch?v=_lkjfvyUGg8 http://www.rc-heli.de/board/showthread.php?t=189318 http://www.frsky-rc.com/download.asp?id=23
• FrSky. Conversion! http://www.youtube.com/watch?v=DHnV6hGH108&feature=related
• FrSky. DIY module : http://www.frsky-rc.com/ShowProducts.asp?id=85
• Replacing receiver with jeti duplex system. Supports all 16 channel with mikrokopter receiver, or 8-channels with the normal ones plus Supports multiple receivers. Not clear is the range (uses xigbee inside, maybe small range) 300-400 meters (http://forum.mikrokopter.de/topic-22404.html). A lot of telemetry data. (look in mikrokopter. http://www.mikrokopter.de/ucwiki/JetiDuplex, https://www.mikrocontroller.com/index.php?main_page=product_info&cPath=108&products_id=599, https://www.mikrocontroller.com/index.php?main_page=index&cPath=108) ~ 200
• It's possible to modify turnigy to accept ppm-in signals to add another turnigy or a FPV headtracker. (a resistor)
• LCD backlight mod is almost necessary.
• Turnigy mod, using frSky FJT. http://www.daddyhobby.com/forum/showthread.php?t=67760
• Guía español: http://www.aeromodelismovirtual.com/showthread.php?p=172718

http://mikrokopter.altigator.com/receivers-c-11.html

http://www.kopter-shop.de/artikeldetails.php?aid=249

http://www.cnc-modellsport.de/product_info.php?cPath=36_37&products_id=1079

http://www.rc-fliegerhorst.de/GWS-3-Blatt-Propeller-HD-CR-9050x3.html?refID=scx

http://www.owl-modellbau.de/

http://rc-city.de/

http://emt.engel-modell.de/

http://www.mamo-modelltechnik.com/

http://shop.elcon-germany.de/Ladegeraete-12V

http://www.modellhobby.de/

http://www.faber-modellbau.de/index.php/katalog/nlayer/12-1-fernsteuerungen.html

http://www.rc-easy.com

https://www.mikrocontroller.com/index.php?main_page=index&cPath=108

http://www.immersionsflug.de/Headtracker-Modul-fuer-Fatshark-Dominator-Videobrille

http://www.conrad.de/ce/de/product/207874/FCO-V-EYES-VIDEOBRILLE/SHOP_AREA_38336&promotionareaSearchDetail=005

http://www.d-edition.de

http://www.rc-toy.de

http://tt-rc.ath.cx/SHOP/ITEM-41

http://www.schiwi-shop.de/product_info.php?products_id=114

http://www.conrad.de

http://3dmodellflug.de/

http://www.zimo2004.de/index.php?cid=69b1873104518cb9d3fdeb836426db35&sa=1

http://www.modellbau-bichler.de/index.php

http://www.hoelleinshop.com/

http://www.mhm-modellbau.de/part-FrSky-DHT.php

http://www.hobbypartz.com/79p-th9x-r9b-9channel-radio.html

http://www.toysonics.com/

http://h1071244.hobbyshopnow.com/

http://www.hobbyking.com/hobbyking/store/uh_viewitem.asp?idproduct=8992&aff=34224

http://www.flytron.com/

http://www.puffinmodels.com/

http://mikrokopter.altigator.com/satellite-receiver-jeti-duplex-rmk2-24ghz-p-53.html

https://www.leaderhobby.com/product.asp?ID=9394001220407

http://leaderhobby.com/product.asp?ID=9394001220239

http://www.r2hobbies.com/eng/proddetail.php?prod=rcps2805003_mode

http://rc-fans88.com/

http://www.miracle-mart.com/store/index.php?main_page=shippinginfo

http://www.chrommodellbau.ch/index.php?act=viewProd&productId=406

http://www.airheli-shop.cz/turnigy-2-4-k285/

Send to germany! http://rctanksaustralia.com/shop/index.php?main_page=product_info&products_id=29

Cheap! frFly! http://www.giantcod.co.uk/

Send to germany! http://www.electriflite.co.uk/store/index.php/receivers/frsky-2-4ghz.html

http://www.t9hobbysport.com/default.asp?CatID=106&SubCatID=183

http://www.rangevideo.com/index.php?main_page=product_info&products_id=245

http://www.flytron.com/31-oem-dt-3k-hybrid-headtracker-for-all-ppm-transmitters.html

http://www.rcgroups.com/forums/showthread.php?t=1244359&page=10

http://www.rcgroups.com/forums/showthread.php?t=1156807

http://www.conrad.de/ce/de/product/207874/FCO-V-EYES-VIDEOBRILLE/SHOP_AREA_38336&promotionareaSearchDetail=005

http://www.amazon.de/FlyCamOne-FC2410-eco-V2/dp/B003JNVNE2/ref=sr_1_1?ie=UTF8&qid=1324773181&sr=8-1

http://www.immersionsflug.de/Headtracker-Modul-fuer-Fatshark-Dominator-Videobrille

www.gowiththeshark.com/RCV230_RC_aerial_video_wireless_camera_vision_system_headset.html

http://fpvlab.com/forums/archive/index.php/t-1451.html?s=4bbf06a97e3b1d9c9d4ff846254b7da1

http://www.fpvuk.org/forum/index.php?PHPSESSID=56aca52a2e142176227357d5700e252e&topic=2934.15

http://www.rcgroups.com/forums/showthread.php?t=1266162&page=816

http://www.traudlsmodellbau.com/category/modellbautage-flugwerft/

http://home.arcor.de/homepage.mf/r-mobau.htm

http://www.rc-modellflugplatz.de/modellbau-haendler/modellbauhaendler-deutschland_k1/

http://www.muenchen.de/service/branchenbuch/M/249.html

http://www.rcvideos.tv/hobbyking/turnigy-9x-frsky-dht-8ch-diy-tx-module-installation-2-way-telemetry-receivers-hobby-king-kit/