[Moon] 3 cm circular polarisation
Fausto Coletti
faustocoletti at alice.it
Sun Sep 21 18:41:19 CEST 2014
Hi Barry,
I think that nothing is simple in setting up a 10 GHz EME station.
Surely most of the stations using linear polarization but I believe
that this should not stop the testing of new solution.
I also believe that if one is able to realize a 10 GHz EME station,
where, however, you have to build everything, the least of the
problems is to build a good circular feeder.
And I do not think the problem is the instruments because it is
also necessary to develop a linear feeder.
Everyone up to 5.7 GHz using circular polarization without problems.
I think that making the feeder for 3 or 6 cm involving the same difficulties.
I am realizing my EME station and surely I'll start with the circular polarization.
If I will consider it necessary, I will build also a linear feeder.
73 and my best congratulations for your activity on higher band.
I hope to contact you when I will be ready.
Fausto IK4NMF
----- Original Message -----
From: Barry Malowanchuk
To: Dom DEHAYS
Cc: moon at moonbounce.info ; Moon-Net
Sent: Sunday, September 21, 2014 3:51 PM
Subject: Re: [Moon] 3 cm circular polarisation
That is a very good point Dom ! Also making a CP feed is not easy or low cost to buy, which makes it difficult for new stations to start. I think that Most stations are still linear so the 3 dB penalty is there for many QSOs.
I have a CP feed with WG input, but I am still linear here
73
Barry VE4MA
------------------------------------------------------------------------------
From: "Dom DEHAYS" <f6dro at wanadoo.fr>
To: "SM6CKU" <ben at sm6cku.se>, "Moon-Net" <moon-net at mailman.pe1itr.com>, moon at moonbounce.info
Sent: Sunday, September 21, 2014 5:15:51 AM
Subject: Re: [Moon] 3 cm circular polarisation
Hi all ,
I have no personnal objection to go CP on 3cm eme BUT it should be done with a waveguide access on the RX side of the feed.Most feeds with a polarizer I have seen yet use an SMA connector on the RX side , it is a problem as we need to use a coaxial sma relay for isolation and a cable ( and/or adapter(s)) to connect a coaxial preamp . This will give significantly reduced Rx performances compared to a waveguide system.
73
Dom
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