[eagle] Re: Eagle Microwave Antenna Arrays -- mechanical concepts

John B. Stephensen kd6ozh at comcast.net
Fri Mar 23 13:10:20 PST 2007


I agree. If you had 5-bits of phase control (11.25 degree steps) the noise 
would be 24 dB down.

73,

John
KD6OZH

----- Original Message ----- 
From: "Franklin Antonio" <antonio at qualcomm.com>
To: <K3IO at verizon.net>
Cc: "AMSAT Eagle" <Eagle at amsat.org>
Sent: Friday, March 23, 2007 19:53 UTC
Subject: [eagle] Re: Eagle Microwave Antenna Arrays -- mechanical concepts


> At 08:52 AM 3/23/2007, Tom Clark, K3IO wrote:
>>IMHO, this is a REALLY BAD  :-P idea because there will be abrupt
>>phase and amplitude discontinuities when switching from one beam to
>>the next as the s/c spins.
>
> You should not fear small phase discontinuities from steps in the
> beam forming.  These phase jumps will be very small, and will have
> only a tiny effect on coded BPSK modulation.
>
> We do not need to do anything fancy to eliminate small phase steps
> that will have no impact on performance.
>
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