RE: Confusion getting homevison onto TV

["Graham Howe" <graham@xxxxxxx>]

Thanks for the feedback, I think I'll give up on this desire and instead
feed the video from the CCTV switcher to the homevison, feed the combined
output to the modulator and then distribute as a dedicated channel. I could
then use IR to switch any TV to the homevision channel when movement is
detected or a message is being sent (infact I could use IR distribution for
HV to switch automatically). If I had automatic switching in this way I
could of course turn it off when watching movies etc. Until I have several
KAT5 units I can't do composite or scart distribution as I only have CAT5,
CT100 and Speaker wire going to every room (there had to be a limit !).

Regards

Graham

> -----Original Message-----
> From: Keith Doxey [mailto:ukha.diyha@xxxxxxx]
> Sent: 22 March 2001 19:49
> To: ukha_d@xxxxxxx
> Subject: RE: [ukha_d] Confusion getting homevison onto TV
>
>
> Hi Graham,
>
> you CAN NOT have HomeVision overlayed onto 2 or more
> different sources.
>
> One option for relaying it round the house is to use an old Analogue
> Satellite receiver and connect HV to the VCR scart. The
> advantage in using a
> Satellite receiver rather than a VCR is that many Satellite
> receivers have a
> UHF modulator that can cover the whole UHF band (21-69)
> whereas most VCR's
> are 30-39 only.
>
> If your primary requiremt is that every TV should display a
> pop up message
> then there is a compromise. Connect the HV to the main TV
> using the output
> of a SCART thereby feeding HV with the output of the main TV's tuner.
> Distribute the output of Homevision as composite video and
> feed it into a
> SCART on each TV. Use HV to control pin 8 of the SCART. You
> can selectivly
> "grab" any or all of the TV's. The only failing with this
> plan is that TV's
> other than the main one may get a different channel whilst
> the message is
> displayed. eg
>
> Normal Viewing			HomeVision Message
> Main TV on BBC1			Text overlayed on BBC1
> Kitchen TV on ITV			Text overlayed on BBC1
>
> When HV releases control the TV's return to what they were
> watching. The
> only other drawback is if you have another active SCART
> signal that has been
> overridden because some TV's will revert to that source instead.
>
> One thing I am working on for the KAT5 switcher is the
> ability to integrate
> Homevision for messages in the room where commands are being
> received. If
> you are in the Kitchen and are watching the DVD via KAT5 and sent some
> commands to HV then the switcher would select Homevision's
> input from DVD,
> overlay text and temporarily change the source for the
> kitchen from DVD to
> Homevision. It would then revert back to DVD ready for some
> other room to
> use HV. "Broadcast" messages like Caller ID still present
the
> problems you
> describe of not being able to overlay several different sources.
>
> The only way round that is to duplicate the video overlay section of
> Homevision x number of times. It would probably be quite easy
> to drive all
> the video circuits with the same text so that every overlay
> unit did the
> same, but if you are goig to that much trouble you want the ability to
> display different text in each zone.
>
> There are several video overlay units available. Look at
> http://www.decadenet.com/ for
the "BOB-11"
>
> Keith
>
> -----Original Message-----
> From: Graham Howe [mailto:graham@xxxxxxx]
> Sent: 22 March 2001 17:41
> To: UKHA List (E-mail)
> Subject: [ukha_d] Confusion getting homevison onto TV
>
>
> I want to be able to show homevison messages on TVs around
> the house, with
> the messages broadcast over the top of the existing TV
> program, is this
> possible? I can see that it is possible to have a composite video feed
> passed into Homevision and then the 'combined image' to be
> sent back out as
> composite video. I can take a composite feed and modulate it
> so that it
> appears on a dedicated channel. I can also use a signal
> booster/distributor
> to pass UHF around the house.
>
> I can see that if I had an aerial feed into a video recorder, took a
> composite video feed out of that and into homevision, took a
> composite video
> feed (with overlay) out of homevision and into an rf
> modulator, took the rf
> output from the modulator and into the booster/distributor I
> would then have
> 'TV overlayed with Homevision' throughout the house, but
> everyone would be
> watching the same channel to see the messages.
>
> Am I missing some simple solution or is it impossible to
> achieve what I want
> to do.
>
> Just in case this lot doesn't make sense, here is the bottom line:
>
> Can I have homevision messages displayed over the top of terestrial TV
> simultaneously on two TVs that are watching different channels?
>
> Regards
>
> Graham
>
>
>
>
>
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