[mythtv-users] No reception or EIT for Channel 5 in Essex

[peter nikolic]

On Tuesday 16 September 2008, Allen Edwards wrote:
> > I think you need to back to collage   a little .
> >
> > I did state UK and COAX i care not for the US system of 300 Ohm ribon
>
> Free space is 377 ohms so they build antennas at 300 ohms to match
> into free space.  Then they use a 4:1 transformer (a balum) to match
> to the 75 ohm coax.  I see from looking at amazon.co.uk that all your
> antennas have balums built in for some reason.  Sorry, I did not
> realize that.
>
> I also didn't realize that hybrid combiners like these:
> https://www.tselectronic.com/chanplus/2532_34.html
> had not made it over there yet.  You really should get some so you
> don't have to mismatch the coax the way you explained in your writeup.
>  Too bad you use such junk over there when these combiners are so
> inexpensive.
>
> By the way, I have a Masters in EE from Stanford, an Extra Class Ham
> license, and 30 years experience in RF.  That is enough education for
> now.
>
> Allen
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Obviously not quite enough in thius instance   next time engadge brain before 
mouth we are a 75 ohm coax system here in the UK we do NOT use 300 ohm ribbon

EOS


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