First correct answer gets a coconut
 

In 1983 I installed a TV system in a big new house for an up and
coming feller. Because Emley Moor reception was poor I added an aerial
for Bilsdale. The two aerials were simply diplexed together after
their respective masthead amps. There were no other possible
transmitters in the area. The diplexer (21-34 and 37-53) output went
to a splitter, which combined the aerial signals with the outputs of
the channel filters for the VCR, and later the satellite receiver,
which I added a few years later when Sky started. The outputs of the
satellite receiver and the VCR were fed into the system so they could
be watched anywhere in the house. All very modern and high tech! The
VCR was on ch36 and the satellite was on ch39, the constraint being,
of course, the limited range of the modulators those days.
When Channel Five started up on ch37 from Emley Moor it miraculously
worked, despite being at the end of the diplexer’s Group B range. It
had no effect on the VCR reception because all the TV sets were happy
with adjacent channel working.
When Channel Five started up on ch35 from Bilsdale the lower sideband
of the VCR output would have wiped it out, but it didn’t matter
because the C5 reception from Emley was alright, so Bilsdale ch35
wasn’t even tuned in, nor did it get through the diplexer intact.
When a succession of Sky boxes was installed over the years by Sky the
engineers tuned the outputs to ch39, as per the label on the cable, so
no problems arose.
When a DVD player arrived it was scarted into the VCR and the customer
was able to watch DVDs anywhere in the house via the VCR, so no
problem there.
When the customer was ill and wanted to change channel on the
satellite from his bedroom his son bought a radio remote gadget, and
that solved the problem.
When DTT started from Emley Moor and Bilsdale there wasn’t a problem.
None of the muxes affected the satellite and VCR channels, or vice-
versa.
New TV sets were bought and installed, and autotune did everything it
should.
So 27 years elapsed without a visit to the house by me. Then, today, I
had to go. A problem had arisen a few weeks ago, and it had taken
until the other day for them to get round to ringing me. As is often
the case the customer had developed a variety of alternative
hypotheses to explain the fault, none of which were remotely accurate.
Nothing in the house had broken down or changed materially. The
solution to the problem took 30 minutes to implement, and was totally
successful. What was the problem?

First correct answer gets a coconut
 

In message
,
" writes
In 1983 I installed a TV system in a big new house for an up and
coming feller. Because Emley Moor reception was poor I added an aerial
for Bilsdale. The two aerials were simply diplexed together after
their respective masthead amps. There were no other possible
transmitters in the area. The diplexer (21-34 and 37-53) output went
to a splitter, which combined the aerial signals with the outputs of
the channel filters for the VCR, and later the satellite receiver,
which I added a few years later when Sky started. The outputs of the
satellite receiver and the VCR were fed into the system so they could
be watched anywhere in the house. All very modern and high tech! The
VCR was on ch36 and the satellite was on ch39, the constraint being,
of course, the limited range of the modulators those days.
When Channel Five started up on ch37 from Emley Moor it miraculously
worked, despite being at the end of the diplexer’s Group B range. It
had no effect on the VCR reception because all the TV sets were happy
with adjacent channel working.
When Channel Five started up on ch35 from Bilsdale the lower sideband
of the VCR output would have wiped it out, but it didn’t matter
because the C5 reception from Emley was alright, so Bilsdale ch35
wasn’t even tuned in, nor did it get through the diplexer intact.
When a succession of Sky boxes was installed over the years by Sky the
engineers tuned the outputs to ch39, as per the label on the cable, so
no problems arose.
When a DVD player arrived it was scarted into the VCR and the customer
was able to watch DVDs anywhere in the house via the VCR, so no
problem there.
When the customer was ill and wanted to change channel on the
satellite from his bedroom his son bought a radio remote gadget, and
that solved the problem.
When DTT started from Emley Moor and Bilsdale there wasn’t a problem.
None of the muxes affected the satellite and VCR channels, or vice-
versa.
New TV sets were bought and installed, and autotune did everything it
should.
So 27 years elapsed without a visit to the house by me. Then, today, I
had to go. A problem had arisen a few weeks ago, and it had taken
until the other day for them to get round to ringing me. As is often
the case the customer had developed a variety of alternative
hypotheses to explain the fault, none of which were remotely accurate.
Nothing in the house had broken down or changed materially. The
solution to the problem took 30 minutes to implement, and was totally
successful. What was the problem?

A tree that took 27 years to become an obstruction?
--
Ian

First correct answer gets a coconut
 

On Tuesday, April 20th, 2010 16:14:44 -0700, Wrights Aerials wrote:

When a succession of Sky boxes was installed over the years by Sky
the engineers tuned the outputs to ch39, as per the label on the cable,
so no problems arose.

Emley Moor has now started (March 31st, 2010) broadcasting the temporary
low power Freeview HD multiplex on UHF ch 39.

First correct answer gets a coconut
 

On Apr 21, 12:39*am, J G Miller wrote:
On Tuesday, April 20th, 2010 16:14:44 -0700, Wrights Aerials wrote:
When a succession of Sky *boxes was installed over the years by Sky
the engineers tuned the outputs to ch39, as per the label on the cable,
so no problems arose.

Emley Moor has now started (March 31st, 2010) broadcasting the temporary
low power Freeview HD multiplex on UHF ch 39.

Coconut

Bill

First correct answer gets a coconut
 

On Tuesday, April 20th, 2010 17:47:45h -0700, Wrights Aerials wrote:

Coconut

Will it be delivered by an African Swallow? ;)

http://www.youtube.COM/watch?v=JHFXG3r_0B8


You stated that Emley Moor reception at this location was poor.

Does poor mean low in signal strength or refer to other reception problems
(eg multipath ghosting)?

If it does, then is it a little surprising that the Freeview HD transmission
which is only 4 kW (same as Multiplex D) is causing problems with the analog
signal distributed internally on UHF ch 39?

Was your solution to simply to retune the UHF channel output of the BSkyB box?

First correct answer gets a coconut
 

On 21/04/2010 02:14, J G Miller wrote:
On Tuesday, April 20th, 2010 17:47:45h -0700, Wrights Aerials wrote:

Coconut

Will it be delivered by an African Swallow? ;)

http://www.youtube.COM/watch?v=JHFXG3r_0B8


You stated that Emley Moor reception at this location was poor.

Does poor mean low in signal strength or refer to other reception problems
(eg multipath ghosting)?

If it does, then is it a little surprising that the Freeview HD transmission
which is only 4 kW (same as Multiplex D) is causing problems with the analog
signal distributed internally on UHF ch 39?

Was your solution to simply to retune the UHF channel output of the BSkyB box?


No. Bill would have had to retune the Sky and then in turn retune the
channel filter (if that was possible) or replace the filter then retune
the TV's.

The Digital Mux, even low power, would have made the Sky Channel on the
RF appear noisy.

Glenn.

First correct answer gets a coconut
 

In message , Brian Gaff
writes
I blame the Government myself...

Brian

I was wondering how long it would be before Gordon Brown got the blame
for volcanic ash.

It started yesterday, and has become a chorus today.
--
Ian

First correct answer gets a coconut
 

On Apr 21, 2:14*am, J G Miller wrote:
On Tuesday, April 20th, 2010 17:47:45h -0700, Wrights Aerials wrote:
Coconut

Will it be delivered by an African Swallow? *;)

* * * * http://www.youtube.COM/watch?v=JHFXG3r_0B8

You stated that Emley Moor reception at this location was poor.

Does poor mean low in signal strength or refer to other reception problems
(eg multipath ghosting)?
Both

If it does, then is it a little surprising that the Freeview HD transmission
which is only 4 kW (same as Multiplex D) is causing problems with the analog
signal distributed internally on UHF ch 39?
The Emley analogue signals are carried on the system at similar levels
to the in-house signals. The field strength as received is irrelevant,
because amplification is used. The ch39 signal is about 23dB below the
analogue channels, so the signal/noise ratio of the ch39 in-house
signal is about 20dB worse than it needs to be.


Was your solution to simply to retune the UHF channel output of the BSkyB box?
Yes. Re-tuned the Skybox to ch32, retuned the channel filter to ch32,
put a bandpass filter on the Emley aerial to clear ch32, disconnected
the Bilsdale aerial.

Bill

First correct answer gets a coconut
 

On Apr 21, 8:31*am, Glenn Millar wrote:
On 21/04/2010 02:14, J G Miller wrote:





On Tuesday, April 20th, 2010 17:47:45h -0700, Wrights Aerials wrote:

Coconut

Will it be delivered by an African Swallow? *;)

* * * * *http://www.youtube.COM/watch?v=JHFXG3r_0B8

You stated that Emley Moor reception at this location was poor.

Does poor mean low in signal strength or refer to other reception problems
(eg multipath ghosting)?

If it does, then is it a little surprising that the Freeview HD transmission
which is only 4 kW (same as Multiplex D) is causing problems with the analog
signal distributed internally on UHF ch 39?

Was your solution to simply to retune the UHF channel output of the BSkyB box?

No. Bill would have had to retune the Sky and then in turn retune the
channel filter (if that was possible) or replace the filter then retune
the TV's.

The Digital Mux, even low power, would have made the Sky Channel on the
RF appear noisy.

Glenn.- Hide quoted text -

- Show quoted text -

Yes, that's it.

Bill

First correct answer gets a coconut
 

On Wednesday, April 21st, 2010 at 04:35:13 -0700,
Wrights Aerials explained:

The Emley analogue signals are carried on the system at similar levels
to the in-house signals. The field strength as received is irrelevant,
because amplification is used.

Thanks for the explanation!

disconnected the Bilsdale aerial.

How sad! No more Carol Malia except via the B$kyB system.