[SBE] coupling receive signals through glass

[Bill Barber]

Works great for through the glass cell phone antennas!  wb

Bill Barber
Chief Engineer, WTVZ-TV
Norfolk, VA
757.622.3333



On 11/9/2010 2:04 PM, Mike Langner wrote:

> In years past (remember 300 ohm flat ribbon line) we used to use two 

> flat, round plates on each side of the glass.  They became single-plate 

> capacitors.  The "kit" came with four round, flat plates about an inch 

> in diameter with 6-32 bolt studs and washers, and a little plastic blob 

> that looked like a large plastic vitamin pill with a little pointy end 

> sticking out that was to be cut off -- the plastic vitamin pill 

> contained fast-setting cement.

>  

> They worked great!!

>  

> Radio Shack, Allied Radio (remember them?), Layfette Radio (remember 

> them?) and a few others sold them.  Perhaps with a little looking you 

> can still find them in the GC or Philmore or similar line.

>  

> If not, it's not hard to "make your own!"

>  

> If you're using coaxial receive cable (RG-6, RG-59 or similar) you can 

> use a pair of 300 ohm balanced to 50 ohm unbalanced transformers on each 

> side of the capacitive thru-glass coupling -- it should work fine.

>  

> Years ago I even knew one guy who used this scheme with a few watts on 

> the 2 meter Amateur Radio band.  Worked great!

>  

> Mike/

>  

> Mike Langner

> Albuquerque, NM

> ____________________________

> 

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