More info, sorry I don't know how to reply to posts on this forum yet. it's not very obvious how that is done. There have been more than a dozen views of the YouTube video. so there is some interest in this. I expected some e-mails sent to me but none yet. then I noticed my e-mail address on the YouTube page is SPELLED WRONG ! Apologies, a friend posted that page for me, I have asked him to correct it but in the meantime, this is my CORRECT address : pelican2(a)silcom.com ( note pelican is spelled with ONE "L", not two ) =========== I have also posted a PowerPoint show on my website ( 26 slides in it ) describing the proposed DF network, in fairly deep detail... http://www.silcom.com/~pelican2/DF_Network.ppsx Some of the info in it is obsolete, the remote control software to run the Icom PCR radios ( written in Java ) is no longer valid... Pity, it really worked great, but Oracle made some changes than rendered it useless. There are alternatives, though. All the remaining technology ( including the DF stuff and GE webserver ) remain valid. ============= The program that created that YouTube display is free and available for download on my website, here : www.picodopp.com The program is called DoppSite, you need a DF to actually use it, but there is a built-in TEST mode that allows the simulation to be run on a Windows PC without any DF or radio hardware. ( that is what the YouTube video shows ) TNX DE WB6EYV