RF Isolation

subway

my parents have a lot of hum when watching tv.
i was asked to investigate and found that my dad had removed the ntl wall points and fitted neater, flush ones.

in doing so he removed the fm/vhf diplexer, which also prevents the above hum.

in looking for a simple solution i came across this
http://www.cybermarket.co.uk/shopscr4767.html

anyone know where i can get one in dublin, or suggest an alternative?

watty

Maplin, Jervais St or Blanch.

paulm17781

watty wrote: »

Maplin, Jervais St or Blanch.

Would this be of any benefit to the average user who has no problems?

subway

watty wrote: »

Maplin, Jervais St or Blanch.

thanks will pick one up tomorrow.

@paulm17781
if it aint broken, dont fix it!

zilog_jones

Do they actually sell them Maplin? I tried to look for them (in the shop and the catalogue) before but found nothing. Are there other names they can go by?

subway

i got the one in maplin on saturday - http://www.maplin.co.uk/module.aspx?ModuleNo=29605&doy=10m3
guys in the shop had no clue what i was asking for,
just give them the product code if you need one

zilog_jones

Does it work? I would have assumed that was only designed for other RF interference, not ground loop noise, though I suppose it could deal with both.

subway

worked perfectly for me, but my wall sockets were unscreened and i wasnt in the humor of re-wiring them to screened ones.

zilog_jones

I got it earlier today and just tried it now. It's a high-pass filter and braid breaker. Unfortunately the filter part goes past 300MHz and also filters out all my cable TV channels. I guess it's designed for UHF only - I should have known being made by some UK company :rolleyes:

Antenna

subway wrote: »

in doing so he removed the fm/vhf diplexer, which also prevents the above hum.

best get that reinstalled again, i'd expect it was against 'terms and conditions' to remove it. The cable company's diplexer also impedes flow of 50Hz AC current on the cable, so has a safety function as well as being a TV/radio diplexer.

zilog_jones

The diplexer we got from chorus last year (big metal box - much larger than the old ones) doesn't seem to solve the problem at all...

subway

Antenna wrote: »

best get that reinstalled again, i'd expect it was against 'terms and conditions' to remove it. The cable company's diplexer also impedes flow of 50Hz AC current on the cable, so has a safety function as well as being a TV/radio diplexer.

can you show me where it says that in the terms and conditions.