[Date Prev][Date Next][Thread Prev][Thread Next] - [Date Index][Thread Index][Author Index]

Re: 70cm Yagi and AO-51



3-dB down each way.  For satellite reception this is not too 
bad.  However, some satellite's circular pol (CP) signals are 
elliptical (have some linear component) if they have a squint angle 
with the ground station.  Thus the use of the linear-pol Arrow and 
the "Arrow Wave" works quite well.

In the past being able to switch sense in CP helps because satellite 
squint can result in a reverse of polarity sense.  Then you have 
AO-51 that utilizes opposite sense CP on different frequencies to 
improve isolation in the onboard receivers.

HNY & 73,
Ed - KL7UW

At 06:54 AM 1/1/2008, Andrew Rich wrote:
>If I have this correct.
>
>1. LHCP recieved on a RHCP can knock your signal down by some 20dB
>2. LHCP matched with LHCP will result in a good signal.
>
>So how does a linear antenna equate when receiving a circular signal ?
>
>And the other way around, a circular receiving a linear signal ?
>
>
>
>
>----------------------------------------------------------------------------
>Andrew Rich VK4TEC
>
>_______________________________________________
>Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author.
>Not an AMSAT-NA member? Join now to support the amateur satellite program!
>Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb

73,
Ed - KL7UW
======================================
  BP40IQ   50-MHz - 10-GHz   www.kl7uw.com
144-EME: FT-847, mgf-1801, 4x-xpol-20, 185w
DUBUS Magazine USA Rep dubususa@hotmail.com
====================================== 

_______________________________________________
Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author.
Not an AMSAT-NA member? Join now to support the amateur satellite program!
Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb



AMSAT Top AMSAT Home