SO-35 Satellite info

My SO-35 QSL cards

The beauty of working the SO-35 satellite is that you don't need a lot of expensive equipment, or complex antennas to work it. This satellite is nothing more than a repeater that is really high, and moving really fast! However, this satellite seems a bit more difficult to work. Especially with an Arrow antenna. I think the reason is that SO-35 puts out such a good signal on 2 meters, it is hard to find exactly where it is in the sky. With the Arrow antenna, the 70 cm part of it is a 7 element yagi, and the 2 meter part of the Arrow antenna is only a 3 element yagi. This means that the 1/2 power beam width is much wider on the 2 meter side (downlink). So, I might be mis-directing the Arrow antenna by say, 30 degrees, yet still hear Sunsat fine. But due to the narrower pattern of the higher gain yagi (the 70 cm yagi) on the uplink, my signal "misses" SO-35. So in my opinion, although this satellite has a great downlink, and a very sensitive receiver, it seems to be slightly more difficult to work.

SO-35 Frequencies:

Uplink Frequency: 436.291 Mhz
Downlink Frequency: 145.825 Mhz

The Doppler-shift-shuffle
This can be a bit tricky. What is happening is that as SO-35 is moving and transmitting, you have to have to adjust your transmit/uplink frequency. It is the same phenomenon as a passing train blowing its whistle, and you hear the tone of the whistle drop as it passes by you. In the case of SO-35, what you have to do is to transmit a little bit lower (yes, lower..) when it is coming at you. I usually start at 436.280. As it is more overhead, you will hear yourself become noisy in your receiver. Just tune up to 436.285, and you wil hear yourself again. As the satellite moves away from you, you will have to change to as high as 436.300.

So where is it at?
You will also need to know when SO-35 is coming over, as well as where it is in the sky. For this you need a satellite tracking program. There are several good ones, I just happened to end up with Winorbit. For more info on where to download a copy and set it up, click here.

To go to Sunsat's web page, just click on the image below.