UHF and VHF

[Rhbeen]

I have an old small arial box in my living room (the size of a power socket). It has 2 arial connections labelled as UHF and VHF.

I have a third arial connection which I use as normal and I have it connected to my freeview box. What are the first 2 connections for???

 

[Diyisfun]

Radio

 

[tim west]

Certainly for radio VHF but not UHF that is for TV pictures (old analogue system)

 

[Softus]

(old analogue system)

Um, Shirley it's the current analogue system.

 

[tim west]

(old analogue system)

Um, Shirley it's the current analogue system.

Yes Shirley it is but not for long, just differentiating it from the digital system that the OP has That UHF is the old analogue system as opposed to the new digital systems around, yes i know freeview uses a terrestial aerial but it receives digital signals as opposed to PAL signals. At work we call PAL the "old" system as we are virtually phasing it out as more studios are refurbed or new ones built.

 

[TicklyT]

(old analogue system)

Um, Shirley it's the current analogue system.

Yes Shirley it is but not for long, just differentiating it from the digital system that the OP has That UHF is the old analogue system as opposed to the new digital systems around, yes i know freeview uses a terrestial aerial but it receives digital signals as opposed to PAL signals. At work we call PAL the "old" system as we are virtually phasing it out as more studios are refurbed or new ones built.

But both PAL and digital signals are still broadcast on UHF carrier frequencies, aren't they?

I didn't think it was that long ago that they stopped broadcasting TV on VHF (405 line B&W wasn't it?)

When we moved in, I think we had six different coax cables coming through the wall into the lounge including 2 redundant VHF and UHF aerials, 2 from a Sky dish, one from a redundant NTL system and the present terrestrial TV aerial. One brick under the window looks like a bit of swiss cheese.

 

[tim west]

Apologies as i can see my post was confusing I shouldnt have used the term UHF as being the old analogue system but rather the system used to carry the old analogue system.

What i do mean to say is that UHF is not associated with ordinary or old analogue radio broadcasts but that freeview can be utilised through digital broadcast for the reception of radio. Old analogue radio is associated with the VHF band rather than the UHF TV band, sorry for the confusion caused.

 

[LeeJC]

Tv broadcasts on VHF and UHF still in some countries. The box you have is misleading in it's design and now i believe you can find them labelled FM and TV as they were intended to bring in 2 seperate feeds from a radio antenna and a tv antenna.

UHF will be TV wether analogue or digital, as correctly stated the carrier is the same, and VHF if connected would be pulled in from a dipole type antenna which very few people seem interested in fitting these days, much rather use that magically quarter wave tuned piece of wire that comes in the box with the radio.

Yagi arrays can pull in VHF to UHF frequencies depending on length of the dipole sitting between the reflectors and directors, but this is never going to give as clear reception as a dipole specifically designed for operation across the frequency spectrum you are looking at.

Pull the unit off and check for 2 cable connections if there is only the one and it's connected to both points then ignore it completely, it doesn't matter which you connect it too, cos as far as i was aware there was no passive or active frequency filtering built into the rear of these devices so reception won't differ greatly between them.

 

[tim west]

Pull the unit off and check for 2 cable connections if there is only the one and it's connected to both points then ignore it completely, it doesn't matter which you connect it too, cos as far as i was aware there was no passive or active frequency filtering built into the rear of these devices so reception won't differ greatly between them.

There could be a capacitor behind the plate, a lot of them were around.