Diplexer

M

Matt

Guest
I just bought a diplexer so I could use a UHF and VHF antenna together and
noticed that the UHF connection for the signal is not connected
to anything on the PCB only the earth is.
Is it normal?

Thanks!
 
So how would the signal get to the desired outlet ?.

Matt wrote:
I just bought a diplexer so I could use a UHF and VHF antenna together and
noticed that the UHF connection for the signal is not connected
to anything on the PCB only the earth is.
Is it normal?

Thanks!
--
X-No-Archive: Yes
 
On Sat, 05 Jun 2004 11:06:34 +1000, atec wrote:

So how would the signal get to the desired outlet ?.

Matt wrote:

I just bought a diplexer so I could use a UHF and VHF antenna together and
noticed that the UHF connection for the signal is not connected
to anything on the PCB only the earth is.
Is it normal?

Thanks!
That's why I am asking if it's normal. I will have a VHF and UHF input and
one output to a wall plate but the UHF hot wire isn't connected to
anything onboard.
 
Test it and see , although I would be expecting a connection , perhaps
the electrons jump the gap ?.

Matt wrote:
On Sat, 05 Jun 2004 11:06:34 +1000, atec wrote:

So how would the signal get to the desired outlet ?.

Matt wrote:

I just bought a diplexer so I could use a UHF and VHF antenna together and
noticed that the UHF connection for the signal is not connected
to anything on the PCB only the earth is.
Is it normal?

Thanks!

That's why I am asking if it's normal. I will have a VHF and UHF input and
one output to a wall plate but the UHF hot wire isn't connected to
anything onboard.
--
X-No-Archive: Yes
 
On Sat, 05 Jun 2004 13:14:56 +1000, atec wrote:

Test it and see , although I would be expecting a connection , perhaps
the electrons jump the gap ?.
That's what I am trying to figure out!

Maybe others have an idea.

Thanks.
 
"atec" <"atec77(notspam)"@hotmail.com> wrote in message
news:40C13AB0.7A310EF5@hotmail.com...
Test it and see , although I would be expecting a connection , perhaps
the electrons jump the gap ?.
capacitively coupled?
 
"Matt" <matt@noemail.net> wrote in message
news:pan.2004.06.05.03.24.52.610000@noemail.net...
On Sat, 05 Jun 2004 13:14:56 +1000, atec wrote:

Test it and see , although I would be expecting a connection , perhaps
the electrons jump the gap ?.

That's what I am trying to figure out!

Maybe others have an idea.

Thanks.
Does the 'hot' loop by the input connection? It may be coupled across. RF
does funny things once you get to UHF and above - an open circuit need not
be an open circuit.

Ken
 
testing will see, the units Im used to have a center conductor
connection but who knows ?.

Peter Parker wrote:
"atec" <"atec77(notspam)"@hotmail.com> wrote in message
news:40C13AB0.7A310EF5@hotmail.com...
Test it and see , although I would be expecting a connection , perhaps
the electrons jump the gap ?.

capacitively coupled?
--
X-No-Archive: Yes
 
On Sat, 05 Jun 2004 16:46:56 +1200, Ken Taylor wrote:

"Matt" <matt@noemail.net> wrote in message
news:pan.2004.06.05.03.24.52.610000@noemail.net...
On Sat, 05 Jun 2004 13:14:56 +1000, atec wrote:

Test it and see , although I would be expecting a connection , perhaps
the electrons jump the gap ?.

That's what I am trying to figure out!

Maybe others have an idea.

Thanks.

Does the 'hot' loop by the input connection? It may be coupled across. RF
does funny things once you get to UHF and above - an open circuit need not
be an open circuit.

Ken
Both earths meet with the Output earth but only the VHF signal connection
meets with the Output signal connection. The UHF signal connection doesn't
connect to anything at all on the board.
 
"Matt" <matt@noemail.net> wrote in message
news:pan.2004.06.05.22.14.20.656000@noemail.net...
On Sat, 05 Jun 2004 16:46:56 +1200, Ken Taylor wrote:

"Matt" <matt@noemail.net> wrote in message
news:pan.2004.06.05.03.24.52.610000@noemail.net...
On Sat, 05 Jun 2004 13:14:56 +1000, atec wrote:

Test it and see , although I would be expecting a connection ,
perhaps
the electrons jump the gap ?.

That's what I am trying to figure out!

Maybe others have an idea.

Thanks.

Does the 'hot' loop by the input connection? It may be coupled across.
RF
does funny things once you get to UHF and above - an open circuit need
not
be an open circuit.

Ken

Both earths meet with the Output earth but only the VHF signal connection
meets with the Output signal connection. The UHF signal connection doesn't
connect to anything at all on the board.

But does the track run past the input track, or the VHF connection? As has
been mentioned, coupling is enough at UHF to get a connection - a direct,
physical connection is not necessary.

Ken
 
On Sun, 06 Jun 2004 10:34:01 +1200, Ken Taylor wrote:

Both earths meet with the Output earth but only the VHF signal connection
meets with the Output signal connection. The UHF signal connection doesn't
connect to anything at all on the board.

But does the track run past the input track, or the VHF connection? As has
been mentioned, coupling is enough at UHF to get a connection - a direct,
physical connection is not necessary.

Ken
Oh so a actual 'hot' connection doesn't need to be made? I installed it
and the UHF signal is still very poor. I got a 43 element UHF from Jaycar
and it doesn't make any signal difference. Both UHF and VHF antennas are
pointing to Mt Dandenong I guess where they should be. Is the UHF band to
be pointed elsewhere? Is there any info on the Web about where to point
the antenna?

The main reason I wanted UHF is so I could watch SBS in a good picture.
The antennas are in the roof.

I am not quite sure what you mean by coupling.

Thanks!
Matt...........
 
On the roof you go and have a watcher at the Telly , now swing the uhf ,
they tend to be a bit pointy in pattern.

Matt wrote:
On Sun, 06 Jun 2004 10:34:01 +1200, Ken Taylor wrote:

Both earths meet with the Output earth but only the VHF signal connection
meets with the Output signal connection. The UHF signal connection doesn't
connect to anything at all on the board.

But does the track run past the input track, or the VHF connection? As has
been mentioned, coupling is enough at UHF to get a connection - a direct,
physical connection is not necessary.

Ken

Oh so a actual 'hot' connection doesn't need to be made? I installed it
and the UHF signal is still very poor. I got a 43 element UHF from Jaycar
and it doesn't make any signal difference. Both UHF and VHF antennas are
pointing to Mt Dandenong I guess where they should be. Is the UHF band to
be pointed elsewhere? Is there any info on the Web about where to point
the antenna?

The main reason I wanted UHF is so I could watch SBS in a good picture.
The antennas are in the roof.

I am not quite sure what you mean by coupling.

Thanks!
Matt...........
--
X-No-Archive: Yes
 
"A bit pointy" :) gets the point across. Does someone know exactly where
SBS transmits from for Melbourne? And where is Matt that you need a 43
element?? Bigger is better, I suppose, but you'll need to be pretty accurate
with the direction of the UHF antenna, as 'atec' says.

Ken

"atec" <"atec77(notspam)"@hotmail.com> wrote in message
news:40C2C426.6FE9C380@hotmail.com...
On the roof you go and have a watcher at the Telly , now swing the uhf ,
they tend to be a bit pointy in pattern.

Matt wrote:

On Sun, 06 Jun 2004 10:34:01 +1200, Ken Taylor wrote:

Both earths meet with the Output earth but only the VHF signal
connection
meets with the Output signal connection. The UHF signal connection
doesn't
connect to anything at all on the board.

But does the track run past the input track, or the VHF connection? As
has
been mentioned, coupling is enough at UHF to get a connection - a
direct,
physical connection is not necessary.

Ken

Oh so a actual 'hot' connection doesn't need to be made? I installed it
and the UHF signal is still very poor. I got a 43 element UHF from
Jaycar
and it doesn't make any signal difference. Both UHF and VHF antennas are
pointing to Mt Dandenong I guess where they should be. Is the UHF band
to
be pointed elsewhere? Is there any info on the Web about where to point
the antenna?

The main reason I wanted UHF is so I could watch SBS in a good picture.
The antennas are in the roof.

I am not quite sure what you mean by coupling.

Thanks!
Matt...........

--
X-No-Archive: Yes
 
On Sun, 06 Jun 2004 20:17:18 +1200, Ken Taylor wrote:

"A bit pointy" :) gets the point across. Does someone know exactly where
SBS transmits from for Melbourne? And where is Matt that you need a 43
element?? Bigger is better, I suppose, but you'll need to be pretty accurate
with the direction of the UHF antenna, as 'atec' says.
I figured that my VHF/UHF combo antenna wasn't pulling in UHF very well,
that a seperate UHF antenna would make a difference. Now I don't know if I
have done it right. Doesn't seem to do any different.


Matt...
 
Matt <matt@noemail.net> wrote in message news:<pan.2004.06.05.00.48.41.922000@noemail.net>...
I just bought a diplexer so I could use a UHF and VHF antenna together and
noticed that the UHF connection for the signal is not connected
to anything on the PCB only the earth is.
Is it normal?

Thanks!
The really cheap diplexers rely on the capacitance and inductance of
the PCB, so it is not unusual to see no components at all on the board
and the tracks apparently going to nowhere.

The more expensive diplexers actually have real capacitors and
inductors on the board.

Regards
Dave :)
 
Ken Taylor wrote:
"A bit pointy" :) gets the point across. Does someone know exactly where
SBS transmits from for Melbourne? And where is Matt that you need a 43
element?? Bigger is better, I suppose, but you'll need to be pretty accurate
with the direction of the UHF antenna, as 'atec' says.

Ken
Well Im thinking very much a layman , so very layman terms ..
and as you know the damn thing will require VERY specific aiming or it
wont hear much at all.
"atec" <"atec77(notspam)"@hotmail.com> wrote in message
news:40C2C426.6FE9C380@hotmail.com...
On the roof you go and have a watcher at the Telly , now swing the uhf ,
they tend to be a bit pointy in pattern.

Matt wrote:

On Sun, 06 Jun 2004 10:34:01 +1200, Ken Taylor wrote:

Both earths meet with the Output earth but only the VHF signal
connection
meets with the Output signal connection. The UHF signal connection
doesn't
connect to anything at all on the board.

But does the track run past the input track, or the VHF connection? As
has
been mentioned, coupling is enough at UHF to get a connection - a
direct,
physical connection is not necessary.

Ken

Oh so a actual 'hot' connection doesn't need to be made? I installed it
and the UHF signal is still very poor. I got a 43 element UHF from
Jaycar
and it doesn't make any signal difference. Both UHF and VHF antennas are
pointing to Mt Dandenong I guess where they should be. Is the UHF band
to
be pointed elsewhere? Is there any info on the Web about where to point
the antenna?

The main reason I wanted UHF is so I could watch SBS in a good picture.
The antennas are in the roof.

I am not quite sure what you mean by coupling.

Thanks!
Matt...........

--
X-No-Archive: Yes
--
X-No-Archive: Yes
 
"atec" <"atec77(notspam)"@hotmail.com> wrote in message
news:40C2F242.86C69214@hotmail.com...
Ken Taylor wrote:

"A bit pointy" :) gets the point across. Does someone know exactly
where
SBS transmits from for Melbourne? And where is Matt that you need a 43
element?? Bigger is better, I suppose, but you'll need to be pretty
accurate
with the direction of the UHF antenna, as 'atec' says.

Ken
Well Im thinking very much a layman , so very layman terms ..
and as you know the damn thing will require VERY specific aiming or it
wont hear much at all.

I wasn't having a shot, I liked the imagery. :)

Ken
 
On Sat, 05 Jun 2004 14:01:43 +1000, Peter Parker wrote:

"atec" <"atec77(notspam)"@hotmail.com> wrote in message
news:40C13AB0.7A310EF5@hotmail.com...
Test it and see , although I would be expecting a connection , perhaps
the electrons jump the gap ?.

capacitively coupled?
Yes I think it is that way; capacitively coupled. I spoke to a friend and
after telling him I put it in the roof he said that is probably why it has
poor reception. Is the UHF signal not very strong compared to VHF?

Matt.....
 
"Matt" <matt@noemail.net> wrote in message
news:pan.2004.06.08.22.54.51.562000@noemail.net...
On Sat, 05 Jun 2004 14:01:43 +1000, Peter Parker wrote:


"atec" <"atec77(notspam)"@hotmail.com> wrote in message
news:40C13AB0.7A310EF5@hotmail.com...
Test it and see , although I would be expecting a connection , perhaps
the electrons jump the gap ?.

capacitively coupled?

Yes I think it is that way; capacitively coupled. I spoke to a friend and
after telling him I put it in the roof he said that is probably why it has
poor reception. Is the UHF signal not very strong compared to VHF?

Matt.....
Not necessarily, but it *is* more likely to be reduced by path losses. Is
your roof a tin roof or tiles? Is there foil insulation up there? Does the
antenna look through trees?

Another clue - which way do other people in your area point their UHF
antennas, and how big are they? (the antennas, not the neighbors).

Ken
 
On Wed, 09 Jun 2004 11:22:09 +1200, Ken Taylor wrote:

Yes I think it is that way; capacitively coupled. I spoke to a friend and
after telling him I put it in the roof he said that is probably why it has
poor reception. Is the UHF signal not very strong compared to VHF?

Matt.....

Not necessarily, but it *is* more likely to be reduced by path losses. Is
your roof a tin roof or tiles? Is there foil insulation up there? Does the
antenna look through trees?

Another clue - which way do other people in your area point their UHF
antennas, and how big are they? (the antennas, not the neighbors).

Ken
The roof is tiled and brick on the outside. So it has to go through brick
and tiles. It has to go through a few trees. People around here only have
combination antennas. VHF/UHF. They are all pointing the same way. I
remember using the most crappy VHF antenna (on my roof) years ago and I
could pick up everything clearly. Now I think I made a mistake about
buying a seperate UHF antenna. Do you think there would be anything else
to improve the reception? Bricks and tiles must really knock the signal
down at least 50%.

Regards,
Matt
 

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