[Moon] [Moon-Net] Estimating 1dB (or smaller) beam width of dish antennas?

[vschald at bluewin.ch]

Hello :

 

Reference of “Microwave Engineers Technical and Buyers Guide” made me rush to my bookshelves …. Thanks God, I have not recycled the Feb 1, 1968 edition.  Where to look … Antenna Section, page 128 ff.  Lots of interesting stuff --- but ---  great surprise … no graph, no formula, no mention of beam width…. 

 

Fall back on my dish nomograph. Quick, accurate answer to many questions. Green lines are example for my 1.8m dish … +/- 0.7 deg 3dB beam width at 10.4 GHz…  Usage should be “self explanatory” … 

Hope pdf will pass gatekeeper.  

 

73 de hb9duk, volk

 

 

Von: Moon-net Im Auftrag von Peter Blair via Moon-net
Gesendet: Sonntag, 23. August 2020 09:13
An: Barry Malowanchuk <ve4ma at shaw.ca>; moon-net <moon-net at mailman.pe1itr.com>
Betreff: Re: [Moon-Net] Estimating 1dB (or smaller) beamwidth of dish antennas?

 

GM guys, 

I have a wonderful (old) circular slide rule calculator from GTE which gives -3dB,-1dB beamwidths and 1st /2nd lobes  and gain  (and on the back it does wind pressure!)  and the values for –1dB on that correspond exactly with those from the very useful link posted by K6ML.

 

For real oldies, if you still have a “Microwave engineers and buyers guide” from the late 1960s I’m pretty sure its in there in the antenna section.

73 Peter G3LTF

 

 

From: Barry Malowanchuk via Moon-net <mailto:moon-net at mailman.pe1itr.com>  

Sent: Sunday, August 23, 2020 5:49 AM

To: moon-net <mailto:moon-net at mailman.pe1itr.com>  

Subject: [Moon-Net] Estimating 1dB (or smaller) beamwidth of dish antennas?

 

GM Bob & Mike,

 

I have a copy of Jasik here and will have a look 

 

Best 73

Barry VE4MA

  _____  

_______________________________________________
Moon-Net posting and subscription instructions are at http://www.nlsa.com/nets/moon-net-help.html