Adding to Brian's explanation,
For the transmission, I was using a 5W RS-HFIQ radio attached to an RM Italy amplifier. The radio is run by HDSDR, so I was able to pipe in audio from both FLDIGI and MMSSTV simultaneously. I continuously sent a blank PSK tone with FLDIGI and then sent various SSTV images from MMSSTV. I had Orbitron controlling the HDSDR frequency to correct for uplink doppler, so both the PSK and SSTV would stay on the correct frequency. It also took a few tries to calibrate the uplink frequency, which was about 250 Hz lower than the published value. This was important because SSTV demodulators want the tones at the correct frequencies.
For spectrum writing, a sent a message with a second instance of FLDIGI while the first instance was sending PSK.
-Stephen, N8URE
That cool! Have you thought of making a YouTube video to show how that works. 73 Robert MacHale. KE6BLR FCC Licensed Radio Operator . http://www.aprsat.com/predict . http://www.spaceCommunicator.club%C2%A0 . Supporting Boy Scout Merit Badges in Radio, Robotics, and Space Exploration
Silly Joke: What did the little mountain say to the bigger mountain? Hi Cliff!
He who dares not offend cannot be honest. -- THOMAS PAINE There is nothing noble in being superior to your fellow men. True nobility lies in being superior to your former self. -- ERNEST HEMINGWAY
On Saturday, November 28, 2020, 10:41:52 AM PST, Stephen DeVience via AMSAT-BB [email protected] wrote:
Adding to Brian's explanation,
For the transmission, I was using a 5W RS-HFIQ radio attached to an RM Italy amplifier. The radio is run by HDSDR, so I was able to pipe in audio from both FLDIGI and MMSSTV simultaneously. I continuously sent a blank PSK tone with FLDIGI and then sent various SSTV images from MMSSTV. I had Orbitron controlling the HDSDR frequency to correct for uplink doppler, so both the PSK and SSTV would stay on the correct frequency. It also took a few tries to calibrate the uplink frequency, which was about 250 Hz lower than the published value. This was important because SSTV demodulators want the tones at the correct frequencies.
For spectrum writing, a sent a message with a second instance of FLDIGI while the first instance was sending PSK.
-Stephen, N8URE _______________________________________________ Sent via [email protected] 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
-
Robert MacHale -
Stephen DeVience