Power needed to hit FM satellites - Satellites Forum at eHam.net

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eHam.net Forum : Satellites : Power needed to hit FM satellites

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Power needed to hit FM satellites	Reply
by W1NCH on February 22, 2003	Mail this to a friend!
My 2m HT puts out only 2 watts, so I figure I'll need a brick of some sort. If I'm using an eggbeater antenna, how much power is recommended? 35w? 50w?

RE: Power needed to hit FM satellites	Reply
by JN3XCV on February 22, 2003	Mail this to a friend!
For satellites you use as little as you need. For instance on Oscar 40 which is 59,000 kilometer away I can use as little as 5 watts! On UO14 I have used an HT with a beam antenna without difficulty. FOr satellites it is all about ERP not just power into the antenna. If I have a vertical with 0dBd of gain and put 50 watts into it my ERP is 50Watts. If I put 5 watts into a beam with 128dBd of gain I get 80watts of ERP. See the the difference. That was the theory behind but in the real world on UO14 there are a lot of lids running as much power as they can muster on US passes. They do this so they can control the sat. So I would say if you expect to work UO14 ensure you have max. ERP. 73 Scott

RE: Power needed to hit FM satellites	Reply
by WA9SVD on February 23, 2003	Mail this to a friend!
I've worked Oscar 14 with two handhelds, using only Diamond replacement whip antennas, not the original rubber duck antennas. And although I THOUGHT I was using the 12V/5W battery pack, it turned out I was using the 7.2V/2.5W battery on the uplink 2M H-T. You DON'T need a lot of power! A little more that I was using would probably give a bit of an advantage, though. (And that was during a pass over North County San Diego, not out in the "boonies.")

RE: Power needed to hit FM satellites	Reply
by WA9SVD on February 23, 2003	Mail this to a friend!
To the JN station: No offense, but I detect a typographical error. A beam with 128 dB gain? Now THAT would be a LONG Yagi! (LOL!) (And don't worry; I mean no disrespect; we all can and do make mistakes, and they can slip through in our posts. I admit to that myself; after all, even if we are Hams, we're still human!) I don't think my software will even model that much gain. I suspect you meant a more likely 12 dB gain.

RE: Power needed to hit FM satellites	Reply
by N6AJR on March 14, 2003	Mail this to a friend!
2 watts and an arrow antenna will work the leo birds just fine.. 73 Tom N6AJR

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