Chanel Bleed Through

[autumcolours]

Just been very self indulgent !!! Bought myself a full HD 50" Panasonic TH-50PZ70B Plasma TV.

Fabulouse picture when TV and Hummy just connected with scart (Hummy fed with Areal RF) but one problem, If RF run to TV, get channel crosstalk, sometimes bad enough to read adds on TV tuner bleed. secondary effect is color goes blotchy.

Slight improvement if Areal feed attenuated (tried 6 & 12db) but still noticeable, live 3 miles from Crystal Palace. search only found adaptations of scart leads.

[grahamlthompson]

Is the RF daisy chained through the hummy. If it is try splitting it before hummy and use a two output amplifier to give a clean feed to the tv. You can also try changing the modulator output channel on the hummy. Just noticed how close you are to the transmitter. Forget the amp use a splitter instead as you probably have loads of signal. The Crystal Palace transmitter uses the following uhf channels so check your hummy modulator is well away from these 22 23 25 26 28 29 30 32 33 34 37 (Digital is on 22 25 28 29 32 34 the rest is analogue tv)

[autumcolours]

Is the RF daisy chained through the hummy. If it is try splitting it before hummy and use a two output amplifier to give a clean feed to the tv. You can also try changing the modulator output channel on the hummy. Just noticed how close you are to the transmitter. Forget the amp use a splitter instead as you probably have loads of signal. The Crystal Palace transmitter uses the following uhf channels so check your hummy modulator is well away from these 22 23 25 26 28 29 30 32 33 34 37 (Digital is on 22 25 28 29 32 34 the rest is analogue tv)[/b]Already splitting RF with separate feed to Hummy and TV. How do I check modulator and would a high level of attenuation help? if so how high.

[grahamlthompson]

Already splitting RF with separate feed to Hummy and TV. How do I check modulator and would a high level of attenuation help? if so how high.[/b]

The modulator won't be a problem as you are not routing the signal through the Hummy. For reference to change the uhf channel its Menu/Preferences/UHF Tuning/Pal I/G. Your problem is likely to be cross talk in a poorly screened scart lead. Try a good quality lead. You can also get hold of scart leads from specialists (try Keene or Maplin) that have pin 19 disconnected (its cvbs out and that can cross talk with cvbs in). I presume you have also set the scart output to RGB and that you are connected to a TV scart that supports RGB. - Menu/Preferences/AV control/TV-Scart choose RGB.

hope this helps

[aldaweb]

Just been very self indulgent !!! Bought myself a full HD 50" Panasonic TH-50PZ70B Plasma TV.

Fabulouse picture when TV and Hummy just connected with scart (Hummy fed with Areal RF) but one problem, If RF run to TV, get channel crosstalk, sometimes bad enough to read adds on TV tuner bleed. secondary effect is color goes blotchy.

Slight improvement if Areal feed attenuated (tried 6 & 12db) but still noticeable, live 3 miles from Crystal Palace. search only found adaptations of scart leads.[/b]
Only just seen this as been away from the forums over Easter.
Sounds like a classic case of crosstalk in the scart lead due to insufficient screening. (caused by the output of theTV tuner on the scart socket interfering with the input). I'd recommend a fully individually screened scart lead or if your scart is openable cut the connections on pins 1,3 (audio) and 19 (CVBS).

[autumcolours]

Only just seen this as been away from the forums over Easter.
Sounds like a classic case of crosstalk in the scart lead due to insufficient screening. (caused by the output of theTV tuner on the scart socket interfering with the input). I'd recommend a fully individually screened scart lead or if your scart is openable cut the connections on pins 1,3 (audio) and 19 (CVBS).[/b]Dont know if scart lead is fully screened but it is fully wired and extremely fat, would the fact that its 5mt long be a problem ?.

[grahamlthompson]

Dont know if scart lead is fully screened but it is fully wired and extremely fat, would the fact that its 5mt long be a problem ?.[/b]

It certainly can. The longer the length in parallel the greater the pickup from parallel connections. Are you using RGB output from the Hummy (by far the best) or CVBS ?.

Things to try - Look at the TV menus see if you can turn off monitor output. Temporarily move your hummy close to the Tv and use a short scart lead. Plug a scart to RGB adaptor (If you are using RGB) into the TV and Hummy. The Hummy adaptor needs to be wired for output and the Tv for input (some are switchable). Connect them with 3 seperate good quality phono leads. If you have enough space and can solder, you can solder phono plugs to good quality TV coax to make the leads (its 75ohm impedance the same as video leads) and this will give maximum immunity to crosstalk. You will need also to connect the audio if you se the tv for sound.

[autumcolours]

It certainly can. The longer the length in parallel the greater the pickup from parallel connections. Are you using RGB output from the Hummy (by far the best) or CVBS ?.

Things to try - Look at the TV menus see if you can turn off monitor output. Temporarily move your hummy close to the Tv and use a short scart lead. Plug a scart to RGB adaptor (If you are using RGB) into the TV and Hummy. The Hummy adaptor needs to be wired for output and the Tv for input (some are switchable). Connect them with 3 seperate good quality phono leads. If you have enough space and can solder, you can solder phono plugs to good quality TV coax to make the leads (its 75ohm impedance the same as video leads) and this will give maximum immunity to crosstalk. You will need also to connect the audio if you se the tv for sound.[/b]Thanks for suggestions, sound not an issue, play sound through a Denon surround amp. Am using RGB out.

[grahamlthompson]

More questions - Does the Denon amp have video switching if so what inputs. Does the Denon amp support upscaling to HDMI (my AVR4306 does)? Does the TV have an HDMI input ?. If yes to both ditch the scart and connect the amp to the tv with an HDMI lead and set the Denon to upscale to 720P or 1080i. (1080p if you have the latest amp and the tv supports it). You will need a very high quality HDMI lead to give you the bandwidth for 1080P. The quality of the Denon upscaler is very good much better than the scaler in my 40" Sony LCD. If like me your Denon amp only has component inputs and not RGB then its worth getting a RGB to component adaptor. I got mine on e-bay from the states for a few pounds. Yout TV definetely deserves the best so if your amp is not new enough to have upscaling then time to start saving, you will be amazed at how much more flexible it is to route everything through an Av amp and a single hdmi to the tv.

My amplifier has a Toppy Twin Tuner PVR, Humax twin Tuner PVR and Denon DVd player attached with a modulator connected to its zone 2 output connected to a kitchen Tv. As a result you can watch any source on the main tv and any other (or the same in the kitchen). RF headphones are connected to zone 3 so you can even listen to the radio as well if you wish. Great for domestic bliss.

[autumcolours]

More questions - Does the Denon amp have video switching if so what inputs. Does the Denon amp support upscaling to HDMI (my AVR4306 does)? Does the TV have an HDMI input ?. If yes to both ditch the scart and connect the amp to the tv with an HDMI lead and set the Denon to upscale to 720P or 1080i. (1080p if you have the latest amp and the tv supports it). You will need a very high quality HDMI lead to give you the bandwidth for 1080P. The quality of the Denon upscaler is very good much better than the scaler in my 40" Sony LCD. If like me your Denon amp only has component inputs and not RGB then its worth getting a RGB to component adaptor. I got mine on e-bay from the states for a few pounds. Yout TV definetely deserves the best so if your amp is not new enough to have upscaling then time to start saving, you will be amazed at how much more flexible it is to route everything through an Av amp and a single hdmi to the tv.

My amplifier has a Toppy Twin Tuner PVR, Humax twin Tuner PVR and Denon DVd player attached with a modulator connected to its zone 2 output connected to a kitchen Tv. As a result you can watch any source on the main tv and any other (or the same in the kitchen). RF headphones are connected to zone 3 so you can even listen to the radio as well if you wish. Great for domestic bliss.[/b]My Denon is 6 years old and am considering replacing it. Cant afford the AVR4306 or 8 and only have budget of around £500-600, can you suggest a good surround amp, prefer 7 Chanel but do not need a FM tuner in it. Also want to replace the main speakers, have Morandt short shelf speakers but want floor standing. My lounge is not big, only 15' X 9' With a new amp do you think I would get better pick using HDMI ?

[grahamlthompson]

My Denon is 6 years old and am considering replacing it. Cant afford the AVR4306 or 8 and only have budget of around £500-600, can you suggest a good surround amp, prefer 7 Chanel but do not need a FM tuner in it. Also want to replace the main speakers, have Morandt short shelf speakers but want floor standing. My lounge is not big, only 15' X 9' With a new amp do you think I would get better pick using HDMI ?[/b]
Hi Keith

There's not much difference between hdmi and component at the same resolution. However I have not seen an AV amplifier that will upscale to its component outputs, thats because it's possible to get high resolution copies from component output with a fast enough PC. HDMI supports copy protection (HDCP) so this in practice makes HDMI your only real option if you want to use all those lovely pixels on your TV.

Bit rusty at the moment as to what's out there but upscaling amps are getting cheaper, have a look at Denon and Yamahas range.
If you get an amp thats 1080P compatible and you wish to use this (lucky you my tvs only 1080i) then bear in mind that it will cost you around £100 for a 6m hdmi cable guaranteed to work with 1080P (you need a bandwith of around 5Gbps). For shorter cables then you could get away with much less.

Graham

[autumcolours]

Hi Keith
There's not much difference between hdmi and component at the same resolution. However I have not seen an AV amplifier that will upscale to its component outputs, thats because it's possible to get high resolution copies from component output with a fast enough PC. HDMI supports copy protection (HDCP) so this in practice makes HDMI your only real option if you want to use all those lovely pixels on your TV.
Bit rusty at the moment as to what's out there but upscaling amps are getting cheaper, have a look at Denon and Yamahas range.
If you get an amp thats 1080P compatible and you wish to use this (lucky you my tvs only 1080i) then bear in mind that it will cost you around £100 for a 6m hdmi cable guaranteed to work with 1080P (you need a bandwith of around 5Gbps). For shorter cables then you could get away with much less.
Graham[/b]Thanks graham, the 2308 seems to fit the bill it does upscaling, the only criticism I saw was that it does not have HD sound. Found silver one for £400 but want a Black one, £500, seems a bit steep for a different color. £100 for the cable is expensive as I also want to replace the main speakers bookshelf Morand-shorts with floor standing.

Installed a Belkin 4 way splitter and now have feeds for both Plasmas, only snag, its a pig adjusting the colors.