[Moon] [Moon-Net] 10 Ghz polarization for where i live

Fri Jan 23 22:28:27 CET 2015

Jim,

-10 dB signal on JT is very strong!  Even better due to CP crosspol with Vpol.

I mentioned recently acquiring a 1.8m offset feed dish (actually it 
was our sat-TV dish but we replaced it so now it is standing idle):
http://www.kl7uw.com/Trees_at_290_Oct20.jpg

There are also two 4-foot c-band mw fiberglass dishes that can be 
seen in the weeds that I have on my for sale webpage (FREE -pickup only).

Rough guess is G = 43 dB, HPBW ~ 1-degree at 10-GHz for the 1.8m 
dish.  The LNB is circa 1994 so probably not low enough NF to 
consider modifying for 10-GHz.  Being offset feed makes possible to 
locate all front-end RF components at the feed.  But I sold off all 
my 10-GHz eme stuff in 2010 after being laid-off as it was clear I 
did not have funds to complete a 10-GHz eme system.

I am most likely to build up Rx capabilities, first, as 30w is 
expensive at 10-GHz ($2400 for DB6NT amp).  I have everything needed 
to assemble a 8.4-GHz DSN receiver except the 400-MHz 
receiver.  10-GHz would require starting from scratch (except the transverter).

I have a ku-band 2.4m dish but the budget to get it setup and working 
is beyond our retirement funding.  I have that dish for sale for $300 
(complete with wr-90 feed, computerized az-el and digital encoders) 
pickup in Nikiski, Alaska.
http://www.kl7uw.com/fs.htm

Finally snowing in Alaska! (about 5-6 inches)!

73, Ed - KL7UW

At 12:48 PM 1/22/2015, Jim Malone wrote:
>Ed,
>
>I would like to add that I am copying the DL0SHF beacon on my 2.4 M 
>CP antenna with a 9 Sync and -10 db typical signal strength even 
>though there is a cross pol error. .
>
>BTW I think the beacon is down now I did not hear it yesterday , but 
>I did copy my own echoes and well as LX1DB .
>
>Jim WA3LBI
>
>From: moon-net-bounces at mailman.pe1itr.com 
>[mailto:moon-net-bounces at mailman.pe1itr.com] On Behalf Of Edward R Cole
>Sent: Thursday, January 22, 2015 1:58 PM
>To: Serge Szpilfogel
>Cc: moon; Moon-Net
>Subject: Re: [Moon-Net] 10 Ghz polarization for where i live
>
>Serge,
>
>If you have Moonsked you can enter the six digit grid square for the 
>beacon and see what the polarity offset angle is for any time in a 
>moon track (providing you entered your grid as home station).  There 
>is no (significant) Faraday Effect at 1296 and above, so that not a 
>factor for 10-GHz.  But spacial offset angle changes as Moon 
>traverses the sky so a single position will not work.  Since your 
>LNB has electrical polarity adjustment that will be useful.
>
>Also observing the astronomical data window in JT65 will show the 
>offset angle if you have entered the beacon station grid into the 
>window for station called.  I find JT65 easier to follow in 
>real-time.  A plus to that is if you have selected the 10-GHz band 
>in JT65 it will also show the Doppler offset (which is huge at 
>10-GHz).  I am getting acquainted with that on 1296.
>
>eg: I entered Jan 27 and at 2300utc the Doppler between DL0SFH and 
>KL7UW on 10-GHz is -5.193 KHz per Moonsked; Pol = -67 degrees.  I'm 
>guessing the grid listed for DL0SFH is his home qth and not that of the beacon.
>
>73, Ed - KL7UW
>
>At 08:22 AM 1/22/2015, David Anderson wrote:
>
>Hi Serge,
>
>
>
>
>My question is how do i figure out the right polarization based on 
>where i live which is almost half way between the west Coast of 
>Canada & Europe???? Is it 45 degrees, 90 degrees or 180degrees or 
>none the one mentionned?
>
>
>
>
>Is there a way to know this information? taking into account that 
>DL0SFH is linear polarity i believe V.
>
>Yes, For example in my MoonSked use the Polarity information (that 
>shows the spatial offset for the time and date and your respective 
>locations) The spatial offset varies with Moon position. Add 90 
>degrees to this Polarity figure to take account of the vertical 
>polarisation of the beacon. You can get this either in realtime or 
>in prediction mode (Sked Maker Window) in MoonSked.
>
>Astronomical Window in WSJT has DPOL figure for this also in realtime.
>
>
>
>As well is the polarization affected by Faraday rotation has it is on 144 Mhz?
>
>No
>
>
>___________________________________________________________________________
>David Anderson, GM4JJJ         E-mail: 
><mailto:david at gm4jjj.co.uk>david at gm4jjj.co.uk
>___________________________________________________________________________
>MoonSked software: Tracking, Prediction, Scheduling and much more.
>Available for Windows, Linux or Macintosh.
><http://www.gm4jjj.co.uk/MoonSked/moonsked.htm>http://www.gm4jjj.co.uk/MoonSked/moonsked.htm
>Mac HP GPS Control: HP Z3801A Time & Frequency Standard software
>
>_______________________________________________
>Moon-Net posting and subscription instructions are at 
><http://www.nlsa.com/nets/moon-net-help.html>http://www.nlsa.com/nets/moon-net-help.html
>
>73, Ed - KL7UW
><http://www.kl7uw.com/>http://www.kl7uw.com
>     "Kits made by KL7UW"
>Dubus Mag business:
>     <mailto:dubususa at gmail.com>dubususa at gmail.com

73, Ed - KL7UW
http://www.kl7uw.com
     "Kits made by KL7UW"
Dubus Mag business:
     dubususa at gmail.com
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