[Amps] 2 x 8877

[R.Measures]

>Whoa, wait a minute! That 150cm by 100 cm opening might be a waveguide 
>beyond 
>cutoff but the attenuation for this size opening is pretty low according to 
>the Bill Orr Radio Handbook.

**  My guess is that, at 28MHz,  the radiation from the antenna is at 
least 30db stronger than that from the window.  .
>
>The chart for this size opening shows a constant attenuation from about 
>1000mhz and lower frequencies on the order of 8db per inch. If the metal 
>is .125 
>inches thick then the attenuation is on the order of only one db!
>
>When the opening is reduced to .125 inches the attenuation is on the order 
>of 
>124 db per inch from about 2000mhz and down. With that level of 
>attenuation a 
>.125 inch thick screen would have about 30db of through loss.
>
>Cutoff means there is signal attenuation, not a total loss of transmission.
>
>73 de K5GW
>