Arissat transponder active over Europe.
Hello,
I was listening to a 21:05 utc pass over Europe and got a nice sstv picture and voice telemetry in full power mode. Since I was listening with a FCD I saw activity on the transponder also. I heard EA1JM calling cq. As soon as it went in eclipse I heard nothing anymore untill LOS.
73, Eric.
Hi,
I have a question, I don't have a SSB rig so I am FM only, wish I could decode telemetry and CW that would be a blast! but as I understand I can't with just FM, or am I wrong? thats OK its a good reson to talk the XYL into letting me buy another radio. Hi Hi. So here is how I am set up. 1.I have my IC28H interfaced to recieve, working on the transmit. with my diemound 510 vert at 50 ft. The rig i tuned to 145.950 MHZ. 2. I use AMsat Predict to track, I am going to go to a program I can track more than one bird at a time with. The nice thing about HRD is the count down to the pass with computer voice, Last I checked HRD was not able to track ARISSsat1. 3. The tracking program runs in the back ground, I am running MMSSTV for SSTV from ARRISsat1 and its running in the back ground as well 4. I use a program called scanner recorder to record the Audio of the pass. you can do this with MMSSTV to but you have to do it manuailly. With scanner recorder once you set it up to record it will do it on its own.
So here is my question, I do get the voice telemetry in the message giving the stats on the bird. If I send this in does it count for a voice contact? or just the secret word? On the secret word contest can you enter each time you hear it, or one of them even if its the same word you already logged or only if there diffrent from what you have already logged? hope that makes sence.
Also I am confused, Eric, said " Since I was listening with a FCD I saw activity on the transponder also. heard EA1JM calling cq." On ARRISSsat1? Live? i did not think we were able to contact each other vie ARISSsat1? I guess that part really confussed me, Eric can you be a little clearer for at the vary least me, if you would please? Thank you.
thanks for taking the time to read my post,
73 KC9PXZ Jimmy En43qt Norwalk, Wisconsin
----- Original Message ----- From: "Eric Knaps, ON4HF" on4hf@telenet.be To: "Amsat - BBS" amsat-bb@amsat.org Sent: Sunday, August 14, 2011 4:18 PM Subject: [amsat-bb] Arissat transponder active over Europe.
Hello,
I was listening to a 21:05 utc pass over Europe and got a nice sstv picture and voice telemetry in full power mode. Since I was listening with a FCD I saw activity on the transponder also. I heard EA1JM calling cq. As soon as it went in eclipse I heard nothing anymore untill LOS.
73, Eric.
-- Amateur Radio Station ON4HF Eric Knaps Satellite manager UBA
Tel. +32472985876 (mobile)
On 8/14/11 4:34 PM, Jim Cameron "KC9PXZ" wrote:
I have a question, I don't have a SSB rig so I am FM only, wish I could decode telemetry and CW that would be a blast! but as I understand I can't with just FM, or am I wrong?
That's correct. It's just not possible to design a highly power-efficient digital modulation method using a NBFM receiver. That requires a linear channel. A FM receiver is nonlinear; it doesn't respond to the amplitude of the signal, and many have limiters. A SSB receiver is "linear" in the sense that there's no limiter and the stronger the RF signal the stronger the audio output. That's why SSB is used for weak signal work, among other things.
The main drawback to the use of standard SSB receivers is of course the great sensitivity to Doppler shift that requires constant tuning. Ideally everyone will move to software defined radios using hardware front ends that are both linear and wideband. The SDX satellite transponder is itself a software defined radio, and using its full capabilities in a future satellite will require a SDR on the ground.
-Phil
participants (3)
-
Eric Knaps, ON4HF -
Jim Cameron "KC9PXZ" -
Phil Karn