[Moon-net] 10Ghz feedhorns

[Jerry Kleker]

Hi Gary,

Thanks for the email.

I hope that I haven't confused you about the polarization thing. The argument/discussion 
pertains to EME polarization.

As far as I know, all terrestrial work is done using horizontal polarization. Probably
there are more fellows using linear polarization on EME but there is a movement toward
the use of circular polarization.

There are many ways to feed your 1.8 M Prodelin dish.

Why don't you take a look at W1GHZ's "ON-LINE MICROWAVE ANTENNA HANDBOOK" at:

http://www.qsl.net/n1bwt/contents.htm<http://www.qsl.net/n1bwt/contents.htm>

This should be of great assistance to you.

As far as power is concerned: The terrestrial guys try to get a few watts to the antenna.
The EME guys with a 10 foot dish or bigger can work many stations using as low as 15 watts but
somewhere between 25 and 100 watts will definitely improve results. The cost for output power
rises exponentially above 15 watts.

73 es GL,

Jerry   W7QX

  Subject: 10Ghz feedhorns


  Jerry,

  I am about to deploy on 10Ghz myself and my intentions are to start 
  with a commercial feed made for my 1.8m prodelin dish.  I thought 
  tests of polarization on 10Ghz sorta indicated not much advantage in 
  circular polarization.  I remember listening to the various wavefiles 
  generated during variuos polarizations and echo testing.

  What is the most used polarization on Tx/Rx currently ?

  How much power is adequate to start with?  I have a 2135 Siemens TWT 
  which I am hoping to get operational.  Is this sufficent?

  Gary, N8CQ