Hmmm, I've got hum

[Wireless]

I bought a VGA to TV converter to connect my pc through my proceed AVP (via composite) to my Faroudja then to my pioneer hd532. Problem is hum.

If I connect the cable directly, I get a picture but bad hum. I tried the RS 75 ohm to 300 ohm - 300 ohm to 75 ohm transformers and they worked great, no hum - also no picture. I'm stumped! Can anyone help me figure out how to get a picture without the 60hz background music?




John
My HT Picts

[Lexman]

John, have you tried going um, wireless? Sorry, bad joke.

Have you tried plugging the computer into an alternate circuit? Sounds like a ground loop to me, and by changing to an alternate circuit, you might be able to get rid of it, once you can isolate it

Lex

[ThomasW]

Double check to make sure that the cable is properly grounded outside the building. A dedicated 8' copper rod is better than a water pipe for grounding.

Or try the Mondial M.A.G.I.C. block.

If all else fails, use a toslink connection to the pre/pro




theAudioWorx
Klone-Audio

[Wireless]

I changed outlets as to Lex's suggestion, but the outlets in the computer room are all on the same circuit, and moving the pc and desk to the living room is not really an option.. Still have hum.

Can't do anything about the grounding of the building as I live in an apartment complex. That's it! I'll move! In the meantime...

I am afraid I will spend $100+ on the Mondial and still have no signal pass through. That's what I don't understand with the transformers, why is no video signal passing through? It seemed to work for others. Is it the Ultimatte Grand 2000 VGA to TV converter?




John
My HT Picts

[John Holmes]

You live in an apartment and own a projector... I'm jealous and impressed!8)




"I came here, to chew bubble gum and kickass. And I'm all out of bubble gum!!!" My DVD's

[Lexman]

John (wireless), just bring that old projector over to my house, and that should take care of the situation. You could come over to watch it whenever you want, lol.

Lex

[Andrew Pratt]

wouldn't a cheater plug help remove the ground form the loop?

[Wireless]

Actually it's just a Rear Projection unit. If you have ever been through a divorce you can understand how a high end home theater system and an apartment can come together.

Try a cheater plug on the pc end?




John
My HT Picts

[Wireless]

You know Lex, you may be on to something. Maybe I should try wireless! Bad joke or not!




John
My HT Picts

[ThomasW]

Cable induced hum won't be stopped by using "cheaters". So bite the bullet and get the Mondial block. I've used one for years and they work very well. Or use a fiber optical connection to run the audio from the PC to the Pre/pro




theAudioWorx
Klone-Audio

[John Holmes]

Well, when I got divorced, I only got the apt so, I truly understand.




"I came here, to chew bubble gum and kickass. And I'm all out of bubble gum!!!" My DVD's

[Wireless]

Thomas,

At this point, I'm not running audio to the Pre/Pro, only video. I have an isolation transformer connected to the cable outlet for the same reason, to eliminate hum. It works and the video passes through. I tried connecting it and I got no hum and NO video. Could it be that the VGA converter is not amplifying the signal enough?




John
My HT Picts

[Lexman]

Yeah, I been there "Johns". lol. Actually, I coudl tell you stories that would curl your ears back, including the great remote caper of 1998, geesh, how did I ever cope!

John, these types of problems can be very vexing. Take it one step at a time, avoid teh cheater plug if possible-

Lex

[ThomasW]

VGA to TV converter to connect my pc through my proceed AVP (via composite) to my Faroudja then to my pioneer hd532.

This is a recipe for multiple ground loops. There's just too much equipment in the signal path.

Why are you running a cable signal into the PC?. Unless your using the PC as a HTPC get it out of the signal path. PC's are very "noisy" and usually lacking in adequate shielding.




theAudioWorx
Klone-Audio

[Wireless]

Lex, at least you have those Sonus Fabers. Sounds like an excellent trade to me.

Maybe I should state the purpose of connectng the PC to the system. I'm not using an HTPC as I have an Elite DV-09 going into a Faroudja 2200.

As I stated in another thread, I recently purchased a Sony Mega changer and a slinke controller for PC. This allows me to download info from the internet, including albumn covers to the pc, for all cds in the megachanger. I was trying to display the jukebox information on the currently playing cd(jukebox software is controlled by a Pronto) on my pioneer RPTV when the cd input is selected. Hence the VGA to TV converter.

I'm not connecting cable to my PC, nor connecting any audio out from the PC to my Processor.




John
My HT Picts

[ThomasW]

Well given the rather bizarre nature of your application, the only possible solution I can think of is probably a Modial MAGIC block (to kill the cable induced hum). Combine that with the stereo audio isolator (CO-2RR) from Jensen transformers (this will kill any audio hum created by the rest of the system). Buy and add the units one at a time until you get rid of the hum. Try lifing all the grounds with "cheaters" before getting the CO-2RR. Jensen products if purchased from Jensen, come with a 100% money back guarantee. Also their tech people are most helpful diagnosing ground related hums, and there several very good "white papers" that can be downloaded from their website.

http://www.jensen-transformers.com/co2rr.html

http://www.jensen-transformers.com/apps_wp.html

Good luck
Thomas




theAudioWorx
Klone-Audio

[Wireless]

Is it bizarre to want to do a search for a particular albumn, artist, or to look at the cover art for a cd that 's playing without having to run into another room?

Thanks for the advice on the transformers. I have the cable isolation model VR-1FF. I will try the baseband model.




John
My HT Picts