[amsat-bb] M2 70cm Cross Yagis on LHCP

[Jean Marc Momple]

Jerry,

Definitely they switch one of the driver element per the WEB site explanation as you explained.

However, I am curious to know how you do so with one Tohtsu 120 coax relay which is a one pole 2 way switch as both the outer screen and the inner connector of the coax has to be switched.

Could you please share, if possible post a sketch on the WEB?


73


Jean Marc (3B8DU) 



> On Oct 15, 2018, at 9:00 PM, jerry.tuyls at telenet.be wrote:
> 
> Hello Sion
> 
> it is easier then you think, i made it also with a relay as M² does, i use a Tohtsu 120 coax relay on 1 off the 2 directors. Just switching the CENTER conductor at 1 director changes the polarisation;
> without a relay, just turn 1 dipole opposite so the center conductor is on the other side of the boom,this gives the other polarisation;
> you can buy a switch from M², but very pricy for +-1m alu element, 1 relay in a alu box 
> i made myself that switches, and works FB; i also made a 4pol switch for 2m and 70cm with 4 cx-120 types per box, but on 70cm i gonna change them into 4 SMA relays i found on a hamfest, they have less loss.
> 
> best 73's
> 
> Jerry
> 
> ----- Oorspronkelijk bericht -----
> Van: "Sion" <9w2qc at 9w2qc.net>
> Aan: "amsat-bb" <amsat-bb at amsat.org>
> Verzonden: Maandag 15 oktober 2018 04:38:02
> Onderwerp: [amsat-bb] M2 70cm Cross Yagis on LHCP
> 
> Dear All,
> 
> We are trying to setup determine how to setup the M2 436CP42UG & 436CP30 antennas for fixed LHCP polarity.  However the manual only provides instructions for RHCP.
> 
> Tried to Google this up but failed to find any information too.  Any pointers or advice will be greatly appreciate.
> 
> Thank you.
> 
> 73, Sion, 9M2CQC 
> 
> 
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