Hi. In February, 2005, the Pen Bay Amateur Radio Club of Rockland, Me, sponsored a contact with the ISS and the students of the Rockland High School. We would like to sponsor a contact with the George's Valley High School in Thomaston. However, the Ham who had the proper antennas and rotors is no longer available. Do you know of anyone in the mid-coast area of maine that may have such equipment? Reply at smithny1b@peoplepc.com as my computer or provider sometimes gives the wrong address. Thanks, Norm Smith, NY1B
SSTV, Need your help in Fine-Tuning SSTV on ISS
Hi all, We need your help in fine tuning the SSTV system on ISS.
Here is how you can help.
VOX Delay: There is an intermittent problem with the VOX box that controls the transmitter switch on the radio. When the VOX hears sound coming from the Laptop, it will turns on the D700 Transmitter. When the sound stops, the transmitter should shutdown in 2-3 seconds.
We need you to listen to the end of the SSTV signal and time the delay. Suggest you also Audio or video tape record the sessions so we can get accurate timing values. The first question is: How long does the Transmitter stay keyed after the end of an image?
What is the slide show delay set for? I have requested it be set for approximately 5 minutes for now, until we make sure we are not driving the transmitter too hard. We do not want the radio to over heat.
Audio Levels: For those of you that are experts in SSTV, please try to guess the Audio levels of the Down link. Is the audio too high or too low. If we turn the Audio level down a bit, we may be able to reduce the number of VOX hangs.
Slant Adjust: The Downlink SSTV slant adjustment has not been set on SpaceCam1. We the experts familiar with Adjusting SSTV slant, to Audio record the Images coming down live and play those images back into your system and see if you can calculate the slant adjustment value. Since SpaceCam1 is based on CPIX, you should be able to use CPIX as your test bed and calculate the slant correction factor.
Other Tuning Suggestions Welcome.
Sincerely
Miles WF1F Marexmg.org
Send your data and image to: sstv@issspacecam.org
The hang time is about 1 second.
Alan WA4SCA
participants (3)
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Alan P. Biddle -
MM -
ny1bravo＠peoplepc.com