RE: RF interference

["Keith Doxey" <lists.diyha@xxxxxxx>]

The problem with taboo channels is that they mix together and create
interference frequencies that affect other channels. Every device with
a
feed through modulator also amplifies the incoming signal slightly.

It could be that with TiVo in circuit the overall RF level is too high.

You can get plug in attenuators that cut the RF level by 6dB or 12dB. I
have
had to use some of these before my RF distribution amp otherwise some
channels suffer strange artifacts.

As a first step (ie Zero cost) I would suggest plotting your channels on
the
Taboo TV guide.

If that fails you need to try attenuation at various points in the RF
chain
to find the optimum place to cut the level.

The best way is with proper measuring equipment but that cost
loadsamoney
:-(

Keith

www.diyha.co.uk
www.kat5.tv


-----Original Message-----
From: BUTLER, Tony, FM [mailto:tony.butler@xxxxxxx]
Sent: 03 July 2002 10:23
To: 'ukha_d@xxxxxxx'
Subject: RE: [ukha_d] RF interference


> I said that as an example.  If your picture goes from good to
> pants just by
> routing thru the TiVo this sounds exactly like a taboo
> channel problem.  The
> fact that you've tried 21 and 69 is meaningless unless you
> know all the
> channels you are receiving and place TiVo on a non taboo one.

I don't see that it is meaningless.
Let's say I stick tivo in and it affects one channel - C5.
I move Tivo to channel 21 and C5 is still affected
I move Tivo to channel 69 and C5 is still affected

This, to me means that whether Tivo is modulating out to 21 OR to 69,
the
interference is still there and thus the Tivo channel is _not_ the
problem
because I have used two widely separated channels with still the same
effect.

Without Tivo, the TV is presented with N RF channels.
Add in Tivo and it should be N+1 RF channels - ie just the addition of
the
Tivo channel.
Or are you suggesting that Tivo is remodulating ALL incoming channels
to
different channels so I have 2 x N channels + 1 for the Tivo output of
recorded material?



Tony


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