[Moon-net] Fwd: 10GHz Polarisation

[Alex]

 Vladimir - large thank for this letter in moon-net - gold words!
I completely agree and I support OK1KIR team
To speak it is possible much....... Let's better more actively to work
Any work is estimated by result

vy 73 Alex RW1AW EME 2m,70-23-13-6-3cm


vmvc> Hello all "new" hams (if anybody,hi) going to initiate some more fun
vmvc> on 10 GHz EME !

vmvc> Please, stop discussion on CP vs linear and spend time to get on either
vmvc> with linear or CP !
vmvc> It could be not more than only up to 3 dB difference at maximum, believe
vmvc> me, not more !!!
vmvc> Look on Brian's achievements ! It does not matter as much if he uses
vmvc> 9W into rotable linear or if he could employ 18W into CP without rotation.
vmvc> Just keep any losses on the feed compartment (RX and TX) as low as possible.
vmvc> Any 1 dB of loss you will be able to kick out of the way between the
vmvc> feed mouth and the gate of LNA FET or TX output would count more than
vmvc> the real difference of CP vs linear !
vmvc> So, take care to eliminate any semirigid or coax jumpers or even improperly
vmvc> matched and/or too long WG transitions!
vmvc> Simplicity will be the winner !
vmvc> Just if you are located in EU and would like to pick up an VK or JA,
vmvc> if active, you should look on a way how to rotate the feed by +/- 45
vmvc> or at best up to +/-90 degrees. Actually you can even rotate the whole
vmvc> rig like do we, at OK1KIR.
vmvc> Be sure, no continuous movement is essential, just a kind of mechanical
vmvc> flip-flop positions like on a mobile phones will serve as well.
vmvc> What you have to do, it is nothing more that to eliminate the sharp signal
vmvc> drop at +/- 90 degrees polarisation off-set. A feed turn by +/- 45 degrees
vmvc> is enough in real life.
vmvc> If you do not believe me, please, spend some time on and evaluate audio
vmvc> recordings on Brian's web page. Please, especially watch the signal
vmvc> strenght in relation to degrees of rotation !

vmvc> By my view, there is factually only one mandatory benefit of CP.
vmvc> You do not need any mechanical rotation or turning of the feed position
vmvc> (polarisation) in respect to where the other party is located !
vmvc> Marko,S57UUU and Ben,SM6CKU did a great job supporting simple way how
vmvc> to get CP on 10 GHz ! Just read the Wuerburg EME conference proceedings
vmvc> and do it !
vmvc> I personally do not think there is principially necessary to continue
vmvc> discusion and approve another recommendation instead of getting active
vmvc> on either with linear or CP ! Who is active on the band takes the steering
vmvc> power !
vmvc> No conclusions or recommendations can serve for him !
vmvc> It absolutely does not mean that I will not continue participation in
vmvc> investigation (research) of CP vs linear benefits.

vmvc> Good luck with linear or CP on MW EME !

vmvc> Vladimir, OK1DAK
vmvc> for OK1KIR EME

vmvc> Just a footnote:
vmvc> After 25 yrs on EME hobby (70cm up to 10 GHz) with almost home made linear,
vmvc> linear rotable and CP, we, at OK1KIR, know what we are talking about.



                                                         rw1aw at appello.de