Hi Hassan,
Just added CAS-4A to the list. I was working off the AMSAT-NA Laminated frequency chart (April 2018). Should have spotted it.
I have also tweaked the frequency on CAS-4B to track with your measurements. Use the same link for the updated program.
I’m tempted to add a few hundred Hertz to the conversion numbers to get them spot on but the error is probably less than the doppler correction required.
Trying to correct for doppler would require a built in tracking program and then you might as well use SatPC32.
73, Terry ZL2BAC
From: Hasan al-Basri Sent: Sunday, April 28, 2019 11:48 PM To: Wendy and Terry Osborne Cc: AMSAT-BB Subject: Re: [amsat-bb] Linear Transponder Up and Down link frequency calculator
Very nice Terry, but you forgot CAS-4a :-)
I work with pre-defined sat pairs to avoid Wifi spikes. Here are the results for some of the common birds using our downlink and your uplink (predicted) vs. what our uplinks really are for perfect audio.
CAS-4B 145.918 435.287 Actual: 435.285.900 XW-2A 145.672 435.043 : 435.042.600 XW-2B 145.733 435.107 : 435.106.800 XW-2C 145.798 435.167 : 435.166.800
Very solid agreement, tnx so much. It would have saved us a lot of time setting up the first time, had we had you nice program.
Please add CAS-4A when you get time.
73, N0AN
Hasan
On Sat, Apr 27, 2019 at 8:41 PM Wendy and Terry Osborne via AMSAT-BB amsat-bb@amsat.org wrote:
Hi Folks,
With the number of Linear Transponder Satellites that are operational or in the pipeline, I thought a simple program to convert uplink to downlink frequencies was worth writing. I’ve written one for Windows. You can find it here: https://www.dropbox.com/sh/4o375h6bygjxkzr/AABi9Ck9Wc6ODrhXwIVHxI-_a?dl=0 I’ve put the exe file and the same file in zip format. I have put all the current birds plus the ones that have launches pending. Just select the satellite of interest from the “Satellite” drop down menu, put your frequency into the text box and hit the Up or Dn calculate button.
Let me know if you think this is useful.
73, Terry Osborne ZL2BAC _______________________________________________ Sent via AMSAT-BB@amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: https://www.amsat.org/mailman/listinfo/amsat-bb