For all the Hams using Macintosh, as well as the Yaesu FT-736R to work the Satellites (You both know who you are), I have written 'MacDoppler' a share ware program which will read in the Keplerian elements (in either format), calculate the position and relative velocity of the Satellite you are tracking and automatically adjust the Doppler shift on both transmit and receive.
I have found this particularly useful for the MIR UHF Safex repeater, where MacDoppler will keep that DISC/ALC meter dead center from AOS to LOS.
I have also used MacDoppler for AO-27, FO-20 and FO-29. It is useful on the linear transponders, in accordance with common practice, the uplink frequency is pegged and the doppler correction for both transmit and receive is applied to the receive (downlink) frequency.
Azimuth & elevation control for the Yaesu G-5400B rotor (with the GS-232 interface) has been added in version 2.
The Application is FAT Binary and will run quite happily on MacOS 7.6
Without registering, the application will track the satellite you choose and display the proper Doppler corrected frequencies that can be entered manually in any rig. If you register, MacDoppler will connect to your FT-736R and G-5400B through any two serial ports and make the corrections for you once a second.
Requirements:
System 7 or later.
Communications Tool Box Serial tool.
Buttons:
'CAT': Turns the FT-736R CAT system on and off (Registered version only)
'Beacon': Switches to/from the beacon frequency in mode.dat for that satellite.
'1..6': Switches amongst the 6 frequencies and modes for that satellite.
'/\' (Up Arrow) Move rx up 10 khz
'\/' (Down Arrow) Move rx down 10 khz
use with shift key to make it 100khz
use the option key to make it tx frequency instead of rx freq.
'blank' Not currently used.
Files (All Simple Text editable):
site.dat: holds your lat and long altitude and minumum elevation....
Location: Toronto
Latitude: 43.706388888
Longitude: 79.24416666
Altitude: 200
Minimum Elevation: -2
kepler.dat: Will read either format keplerian elements.
mode.dat: This file holds all the frequency and mode info for the sats you are interested in.
You can enter up to six frequency and mode combinations as well as a beacon frequency