[amsat-bb] Re: Loosing the north!!!

Danny Casier Danny.casier at skynet.be
Thu Dec 10 23:37:10 PST 2009

It depends what antenna system you have. If you use high gain antenna
system, how can you see the differens? 
Best way is comparing with a no directional antenna before and after the
clip over of the sat. But that's to late for that now. Perhaps we can start
start to messure and after next clip over we can start al over again so we
can compare the data. Messurements must be done with several passes and same


-----Oorspronkelijk bericht-----
Van: amsat-bb-bounces at amsat.org [mailto:amsat-bb-bounces at amsat.org] Namens
Luc Leblanc
Verzonden: donderdag 10 december 2009 22:33
Aan: amsat-bb at amsat.org
CC: eu-amsat at yahoogroups.com
Onderwerp: [amsat-bb] Loosing the north!!!

Again my Alfa Spid AZ rotor act again yesterday evening it loose his north
setting as it is electronicly set with the control box. Very 
easy to reset but in the middle of a snow storm (25cm) i was unable to find
something to point the beam physically to the north.

At the same time there was an AO-51 pass i adjust the rotor to an estimated
north and i follow the whole pass manually writing down the 
real calculated azimuth and the one i got from a maximum signal swinging the
rotor back an forth.

I make another pass doing the same operation to fined tuned my pointing and
today on the 1549 EDT pass i was able to get the satelllite at 
1 degrees AOS ans LOS!! signal was S7 most of the time and reaching S9 near

I don't know if AO-51 is still pointing towards the southern hemisphere but
i notice only one deep fade and signal was much better than the 
first attitude change days and i think he never was so strong?

I'm guessing my "scientific" previous north pointing was bad or my UHF beam
is shooting not towards he point? I'm always using automatic AZ 
tracking could be i was shooting aside of the target for a while...

Just try this on a pass could be you will be astonish too? 

If AO-51 was returned back to his normal attitude i will have to reavaluate
all of what i wrote above.

Luc Leblanc VE2DWE
Skype VE2DWE

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