PAVE PAWS is part of the ballistic missle defense system so it will remain active. We didn't allow for much loss between the U antenna and U receiver so the use of two receivers would require some changes.
 
73,
 
John
KD6OZH
----- Original Message -----
From: RaySoifer@cs.com
To: kd6ozh@comcast.net ; K3IO@verizon.net ; bod@amsat.org ; Senior-officers@amsat.org ; advisors@amsat.org ; eagle@amsat.org
Sent: Sunday, September 17, 2006 15:21 UTC
Subject: Re: [Advisors] Re: [eagle] Re: [Fwd: Re: S band and Eagle: an appeal for ahig...

In a message dated 9/17/06 3:08:03 PM Greenwich Standard Time, kd6ozh@comcast.net writes:
Path loss is 15 dB less at 435 MHz than 2400 MHz and antenna gain is 13 dB less. However, the noise figure is 5 dB higher, so almost twice the EIRP wll be required on a U uplink than an S uplink. The 70 cm receiver has a 200 kHz bandwidth so some class 2 (4800 bps) uplinks could be accomodated. Since they will be BPSK and use FEC, I assume that they will occupy at least 15 kHz each and will have to be spaced at least 25 kHz apart. This could allow 4 uplinks. It's not good to increase the receiver bandwidth as it will let in more PAVE PAWS interference. 


John,

I was thinking in terms of an additional 70 cm receiver to accommodate several conference-grade channels, for those users who may be prohibited from using BOTH L-band and S-band uplinks (think Europe).  Yes, PAVE PAWS is there, sometimes, but it would still be better than no digital access at all.  Also, it's not a certainty that PAVE PAWS will even be there in 2020.

73,

Ray