Hi All,
I agree completely with Bob, WB4APR and this is what is wery well
explained into the article "CIRCULAR POLARIZATION by K4KJ,
a zipped file 5 MB long available from me.
73" de
i8CVS Domenico
- Original Message -
From: "Bob Bruninga "
To: "Thomas Doyle"
Cc: ; "andrew abken"
Sen
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Hi Tom, KN6ZA
With only a 3db loss you can use a linear rec. antenna with no polarity
switching, and avoid the large fading that would occur if the satellite was
transmitting circular RHCP or LHCP(but not linear as you stated)
On the other side if you receive linear and the satellite tran
Hi Thomas, W9KE
In a separate email I have sent to you a very compreensive article
explaining why during an orbit of a LEO satellite like FO-29 the
changes in polarization is generated.
73" de
i8CVS Domenico
- Original Message -
From: "Thomas Doyle"
To:
Sent: Saturday, August 04, 2012
> Not sure why anyone would want to maintain the
> orientation of the satellite in such a way that
> would cause the direction of circular
> polarization to change during the path.
Lets try this approach... As I said before, By the laws of physics, what comes
out one side of a circular polari
Many thanks to Nikolai, VE3NKL, who operated portable from 6 different
grids in Newfoundland, Canada during the past 2 weeks.
*Thanks to his family that shared their vacation time with us "Grid
Chasers" while Nikolai took time out to work the satellite passes.*
Great signal and you handled it
> Not sure why anyone would want to maintain the orientation of the
> satellite in such a way that would cause the direction of circular
< polarization to change during the path.
There are two perspectives in answering this.
1. You used the word "maintain," which implies the ability of the spa
Aloha
I hope to be on the FO-29 pass at 2243Z and
AO27 at 2308Z grandchildren precluding.
As aforementioned my home QTH allows only
the western region and Alaska on these passes.
Hopefully mobile soon!!!
73
de robert, NH7WN
___
Sent via AMSAT-BB@amsat.
Tom,
I don't think any one who designs a system "wants" this to occur, but as a
function of overall system cost it is one of the unavoidable realities.
Its actually a great compromise, because with only a 3db loss you can use a
linear rec. antenna with no polarity switching, and avoid
I can't explain it but have noticed the same polarity changes during a
pass. Like S-9 to S-1/nothing switching between polarities with my
antennas... it's been handy to actually have the ability to change
polarities in the past for me. I do not have the ability to polarity
switch on 2 meters,
Bob,
Thanks for the reply. A student of mine once told me that if someone
tells you something is easy - it is not. Even though this is not only
easy but "very easy" I still need a slight clarification. I think it
boils down to the orientation of the satellite relative to the center
of the earth.
> I believe that is true but that does not explain
> why the optimum polarity setting on the receive
> end would change during a pass.
That's easy. The circularity on a pair of crossed dipoles (about all you can
get on a spacecraft) May be designed for Right hand circularity when viewed
fro
Hi Tom,
I have also noticed the switching of polarity as the sat travels over.
What I have understood to be the mode by which this is occuring comes from
the fact that circular polarized antennas change polarity as you move out of
the main radiation lobe. The main lobe is circular on
Andy,
I believe that is true but that does not explain why the optimum
polarity setting on the receive end would
change during a pass. Perhaps there is some sort of Faraday Rotation
effect but I do not believe that
it can change the direction of the circular polarized signal but who
knows what mag
Hi Mike,
Generally, Sat operators don't call CQ, at least not like they do on HF.
Especially on the FM birds, the general protocol is to throw your call
sign in during a pause in the activity, when you can find one. It's more
like working through a busy terrestrial FM repeater. The trick is to
Hi Tom,
I thought fo-29 was transmitting circular. Would not surprise me if I was
wrong:)
Andy,
kn6za
___
Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author.
Not an AMSAT-NA membe
I had a actual qso on FO-29 the other day and during the contact
circular polarization switching was discussed.
The station I was talking with described a very large change in
received signal strength when switching
between LHCP and RHCP. I have heard other people mention this and I
recall some cha
Good morning
LA4FPA, Ering has asked me to post that he will be qrv on fo-29 and ao-27 this
weekend from Vigra Island which is in JP32 and IOTA EU-056.
Good DX!
73 Wyatt
AC0RA
___
Sent via AMSAT-BB@amsat.org
Hi all- I'm relatively new to sat operations/ but not ham radio(novice in 1987
then general in 1996), and noticed this message. I've been researching alot and
now have suitable equipment for working birds. How would I go about finding
someone(s) to schedule a few contacts with, as opposed to c
Fellow Satellite Operators,
On the 2nd I was glad to make contact with KP2CT on FO-29 for his first
satellite contact and my first contact from the US Virgin Islands. We have been
talking for about a month now and on our second attempt we made it. For
equipment he has a Icom 706 and an arrow a
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