[sarex] Re: ISS-Ham L band contact

[Greg D.]

Or, 100 watts at 80 degrees if your antenna is RHCP like mine is...  Rats.  I only have 10 in the shack, even less on the roof.

Thanks for doing the math, Lou.  Saved me a bunch of time and frustration.

Greg  KO6TH


> From: w5did at mac.com
> To: SAREX at AMSAT.Org
> Date: Tue, 16 Dec 2008 16:33:34 -0500
> Subject: [sarex]  ISS-Ham L band contact
> 
> All
> For those of you that may be considering trying to make a contact with
> the ISS on L band, here is the data you need to help you decide on how
> to do it.
> The measured sensitivity of the L band receiver on a D700 is -105dBm
> for full quieting. The cable loss from the radio to the antenna is
> 9.3db. The antenna gain is zero db.
> The polarization is LHCP. The path loss at the horizon on L band is
> -160dB. That means the required EIRP for a full quieting contact at
> the horizon is 65dBm. The path loss decreases by 15dB at 80 degrees
> elevation so that means you can get full quieting with 50dBm in that
> case. To further elaborate if you use a 20dB gain antenna ( a small
> dish).
> You can do it with 32 watts at the horizon or 1 watt at 80 degrees
> elevation.
> 
> Good luck with your efforts.
> I will try to answer your questions.
> 
> 
> Lou McFadin
> W5DID
> ARISS US Hardware manager
> 
> 
> ----
> Sent via sarex at amsat.org. Opinions expressed are those of the author.
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