Espritmodel.com Telemetry Radio
Reply
Thread Tools
Old Apr 27, 2012, 12:28 AM
Stuart
srnet's Avatar
UK, Cardiff
Joined Dec 2008
3,160 Posts
There is quite a big differance, FSK is direct keying of the transmitter to generate the RTTY, where as what you are doing is generating the audio tones directly and sending them.

Either RTTY or Morse will work here, but if the link quality is going to be poor, then with Morse you can slow it right down and read it by ear under very weak signal conditions. Even if you cant read it yourself by ear then record it and someone else will be able to, helpful backup if we are talking about finding a lost plane.

Bear in mind that RTTY is normally sent at 45.5 baud, which is a great deal slower than a GPS sending out data at its slowest speed, some will go down to 2400baud, some only to 4800baud. Thus you need to read in a string from the GPS, buffer it, and send it out at the much slower RTTY rate.

The approach I adopted in the locator I gave the link to earlier, was a standalone transmitter with its own GPS, after all if you loose a plane becuase the video link goes down, your not going to get the fix info back either.

Sending out the entire GPS string as RTTY is also going to take quite a while, sending out distance and direction is only about 8 characters, enough to work out where your plane has gone.
srnet is offline Find More Posts by srnet
Reply With Quote
Sign up now
to remove ads between posts
Reply


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Discussion Has this been done that anyone knows? dale4040 Waterplanes 30 May 26, 2012 06:56 AM
Discussion Has anyone done a DIY CNC machine to cut out foam? NeveSSL Foamies (Scratchbuilt) 6 Nov 15, 2011 10:14 PM
Discussion has anyone done a wing with floats? THESANDMAN Foamies (Scratchbuilt) 0 Oct 17, 2011 02:26 PM
Discussion Has anyone done the DX7 DSM2 to DSMX FlyorBust Electric Plane Talk 0 Sep 26, 2011 11:45 AM
Question I am just wondering if anyone has done or seen a um t-28 on floats? skarface Micro Ready-to-Fly 2 Sep 18, 2011 09:39 PM