Actually as it is a balanced TX and RX hum should not be a problem, The
major problem is, as the cable length increases, compensating for the
increasing loss with increasing frequency. This is typically done by
Pre-equalisation at the Tx end and Post-equalising at the Rx end. However,
it is not just a case of tweeking to get a flat frequency response at the
output of the Rx, you also have to keep the Group Delay within accepable
limits.

Regards
Chris

Jinx wrote:


> The TEA5114 from Thomson-SCF is a 16 pin and contains three
> 75 ohm switches. To send video down a long cable you can try one
> of the MAX transconductance video driver amp/receiver pairs. I've
> done this to a neighbour's house 100m away down an unused pair
> in a LAN cable using a MAX435 tx and MAX436 rx. The video gets
> there OK, and the balanced signal of the MAX435 eliminates much
> noise. Over that distance though you may need additional filtering if
> the synch pulses get mixed up with hum and cause an unsteady
> picture. 1000m is quite a distance, perhaps you could get advice
> from a TV station techie
>
> A project using the TEA5114
>
> http://www.ozemail.com.au/~tecknolt/ATV/JOTA.htm
>
> > Hmm..does anyone know of a video switching chip ? preferably eight
> > pin...
>
> > If l wanted to send a video signal down say 1km of wire would that work
> > or would l need some type of drivers/recievers ? This really isnt my
field
> > of knowledge just playing around at the moment so if anyone has any
> > handy hints let me know please...thank you
>
> > Paul Drummond
>
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