Re: [amsat-bb] Re: Leila in "jam only" mode

[Dave Guimont <dguimon1@xxxxxxxxxx>]

>
>  When I was testing the phasing harness for the 70cm 14L Arrow, over a
>period of 2 days, I made note of the uplink fading . I stated that the
>signal was slightly better RHCP  then HLP or VLP, big advantage was no
>fading of the uplink. There was also a noticable difference between HLP and
>VLP at different times of the orbit. I suggested that between the two, HLP
>was better most of the time over VLP. RHCP was always better then LHCP.
>See.....
>
>www.qsl.net/kb2m
>
>73 Jeff kb2m
>
> > I've never seen any difference on my 435 uplink even reversing polarity.
> > What sort of polarity changes do you use on your uplink??
> >             73, Dave wb6llo@amsat.org

Hi Jeff,

Yes, at high squints there may be quite a difference, but most of us have 
tons of power we never use at 435...I noticed that after our first hiatus 
with low squints.  I'll do some experimenting again before we get back to 
0/0.  I pay little attention to my uplink set-up...I can crank to adjust, 
but with my poor ears on the downlink I almost run out of crank!!

Try it again at 0/0, let me know if you see much of a difference then...
I make an assumption that satellite antenna xmit lobes play a big 
difference, more noticeable at high squints...I'm just guessing, there are 
sure to be more factors....

On O7 and O8 some of us noticed a big difference in sig strength when the 
pass  was to the east, in comparison to when the pass was to the east. A 
German station published an excellent pictorial of just exactly that 
phenomenon in one of our pubs years ago...lobe patterns were judged to be 
the cause...

I would appreciate hearing from anyone that has knowledge of AO40 patterns 
on xmit, and their opinion...



            73, Dave wb6llo@amsat.org
                    Disagree: I learn.... 

----
Sent via amsat-bb@amsat.org. Opinions expressed are those of the author.
Not an AMSAT member? Join now to support the amateur satellite program!
To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org