I asked TBS about the availability of the TBS6903, which is not currently available on the www.tbsdtv.com website. I got the following reply from their sales department:
"Thank you very much for your inquiry , TBS6903 is stopped production for long time, TBS6903X is the successor, it has all the fucntions of TBS6903 , or can you tell me what's your requirement? we can help to check and confirm , thank you ."
So I told them that the TBS6903 worked very well for receiving GOES GRB weather satellite images, but I tried the TBS6903X and the error rate was much higher than the TBS6903. So high that not very many images get through.
We determined that I have the old version of the TBS6903X, and a newer version is now available. They offered to send me a sample of the new version of the card for testing, and I took them up on that offer.
Also I now have a direct email for their support engineer who can assist me if I run into problems. So hopefully the new TBS6903X will work and there will continue to be a relatively low cost option for the reception of GRB.