Filter out one mux (cheaply!)

My box is a Thomson DHD4000, and at the moment it is picking up
Moel-y-Parc transmitter in addition to my "proper" transmitted (Winter
Hill).

Most of this gives me no problems, apart from channel 58, which
carries Ch4 etc. I believe that the THomson box enters channels into
the lineup on the basis of which mux it identifies first
(numerically), regardless of signal strength.

Unfortunately, channel 58 offers mostly unwatchable transmissions, and
this means that when I re-scan for new channels I often get left with
no Ch4.

If the weather helps me out, I can scan at a time which is less
favourable for receiving Moel-y-Parc, and this usually works, however
I haven't been able to do this for a while now.

Is there a cheap inline filter than I can apply to prevent the box
from seeing channel 58? Or botch job that would do the job equally
as well? The channels that I "need" from Winter Hill overlap the
M-y-P range, so a new aerial wouldn't be the solution.

I think I might just try to use cheaper and cheaper co-ax until the
signal deteriorates sufficiently - would that be an option?

Also, and this is odd, in the technical menu of the box it shows the
name of the transmitter which is being received. Obviously, this is
usually Winter Hill, however for this channel 58 it shows as Wenvoe.
Having looked on the dtg website, Wenvoe doesn't transmit on channel
58, and Moel-y-Parc does. How does the name of the transmitter get
carried, and does this mean everyone receiving M-y-P thinks they are
getting signals from Wenvoe?

Cheers!

Matt

On 3 Nov 2004 04:39:09 -0800, (Matt
Larkin) wrote:


Is there a cheap inline filter than I can apply to prevent the box
from seeing channel 58? Or botch job that would do the job equally
as well? The channels that I "need" from Winter Hill overlap the
M-y-P range, so a new aerial wouldn't be the solution.


Does you box show you what channels it is scanning, could you pull the
aerial lead out when it got to 58 and then put it back in .....

Matt Larkin wrote:


Is there a cheap inline filter than I can apply to prevent the box
from seeing channel 58? Or botch job that would do the job equally
as well? The channels that I "need" from Winter Hill overlap the
M-y-P range, so a new aerial wouldn't be the solution.

You could consider using a VCR or another STB, and put that
between your aerial and Thomson box. Then set the RF output of that
box to UHF Ch58, and hopefully it should mangle up the unwanted mux
sufficiently to make the Thomson ignore it.

Also, and this is odd, in the technical menu of the box it shows the
name of the transmitter which is being received. Obviously, this is
usually Winter Hill, however for this channel 58 it shows as Wenvoe.
Having looked on the dtg website, Wenvoe doesn't transmit on channel
58, and Moel-y-Parc does. How does the name of the transmitter get
carried, and does this mean everyone receiving M-y-P thinks they are
getting signals from Wenvoe?

Wenvoe and all the Welsh transmitters carry the same region (no sub
regions in Wales AFAIK). Therefore there will only be central mux point
for Wales, and this will most likely be in or near Cardiff. Perhaps
at Wenvoe itself.

Matt Larkin wrote:

My box is a Thomson DHD4000, and at the moment it is picking up
Moel-y-Parc transmitter in addition to my "proper" transmitted (Winter
Hill).

Most of this gives me no problems, apart from channel 58, which
carries Ch4 etc. I believe that the THomson box enters channels into
the lineup on the basis of which mux it identifies first
(numerically), regardless of signal strength.

Unfortunately, channel 58 offers mostly unwatchable transmissions, and
this means that when I re-scan for new channels I often get left with
no Ch4.

If the weather helps me out, I can scan at a time which is less
favourable for receiving Moel-y-Parc, and this usually works, however
I haven't been able to do this for a while now.

Is there a cheap inline filter than I can apply to prevent the box
from seeing channel 58? Or botch job that would do the job equally
as well? The channels that I "need" from Winter Hill overlap the
M-y-P range, so a new aerial wouldn't be the solution.

I think I might just try to use cheaper and cheaper co-ax until the
signal deteriorates sufficiently - would that be an option?

Also, and this is odd, in the technical menu of the box it shows the
name of the transmitter which is being received. Obviously, this is
usually Winter Hill, however for this channel 58 it shows as Wenvoe.
Having looked on the dtg website, Wenvoe doesn't transmit on channel
58, and Moel-y-Parc does. How does the name of the transmitter get
carried, and does this mean everyone receiving M-y-P thinks they are
getting signals from Wenvoe?

Cheers!

Matt

I beleive Maplin sell some RF attenuators that could be used to reduce
the signal strength, although this will effect all muxes. I have a
similar problem with a Pioneer DBR-TF100 which gets signals from Winter
Hill and Moel-y-Parc, and screws up BBCi.

Richard.

Matt Larkin wrote:
My box is a Thomson DHD4000, and at the moment it is picking up
Moel-y-Parc transmitter in addition to my "proper" transmitted (Winter
Hill).

Most of this gives me no problems, apart from channel 58, which
carries Ch4 etc. I believe that the THomson box enters channels into
the lineup on the basis of which mux it identifies first
(numerically), regardless of signal strength.


Does this box place received channel duplicates at 800 upwards? Maybe
you could rearrange by renumbering.

If not, bad luck. Making interference on that channel from a video
recorder while tuning looks like your solution. You could buy inline
'notch filters' for specific channels but I've read they are expensive.
Besides, you'd only need it for the period that you are retuning.

I'd contact Thomson and get them to understand this deficiency in their
software. Other manufacturers have implemented workarounds for this.

--

Adrian C

(Matt Larkin) wrote:

My box is a Thomson DHD4000, and at the moment it is picking up
Moel-y-Parc transmitter in addition to my "proper" transmitted (Winter
Hill).

Most of this gives me no problems, apart from channel 58, which
carries Ch4 etc. I believe that the THomson box enters channels into
the lineup on the basis of which mux it identifies first
(numerically), regardless of signal strength.

Jeez. That is one very good reason to avoid the Thompson PVR.

Does anyone know if the Humax and Fusion PVRs have workarounds for this
or manual tuning?

--
Dave Farrance

On Wed, 03 Nov 2004 16:21:05 GMT, Dave Farrance wrote:
(Matt Larkin) wrote:

My box is a Thomson DHD4000, and at the moment it is picking up
Moel-y-Parc transmitter in addition to my "proper" transmitted (Winter
Hill).

Most of this gives me no problems, apart from channel 58, which
carries Ch4 etc. I believe that the THomson box enters channels into
the lineup on the basis of which mux it identifies first
(numerically), regardless of signal strength.

Jeez. That is one very good reason to avoid the Thompson PVR.

Does anyone know if the Humax and Fusion PVRs have workarounds for this
or manual tuning?


The Humax has manual tuning.

In article , Zarnywoop zarnywoo
writes
Matt Larkin wrote:

My box is a Thomson DHD4000, and at the moment it is picking up
Moel-y-Parc transmitter in addition to my "proper" transmitted (Winter
Hill).

Most of this gives me no problems, apart from channel 58, which
carries Ch4 etc. I believe that the THomson box enters channels into
the lineup on the basis of which mux it identifies first
(numerically), regardless of signal strength.

Unfortunately, channel 58 offers mostly unwatchable transmissions, and
this means that when I re-scan for new channels I often get left with
no Ch4.

If the weather helps me out, I can scan at a time which is less
favourable for receiving Moel-y-Parc, and this usually works, however
I haven't been able to do this for a while now.

Is there a cheap inline filter than I can apply to prevent the box
from seeing channel 58? Or botch job that would do the job equally
as well? The channels that I "need" from Winter Hill overlap the
M-y-P range, so a new aerial wouldn't be the solution.

I think I might just try to use cheaper and cheaper co-ax until the
signal deteriorates sufficiently - would that be an option?

Also, and this is odd, in the technical menu of the box it shows the
name of the transmitter which is being received. Obviously, this is
usually Winter Hill, however for this channel 58 it shows as Wenvoe.
Having looked on the dtg website, Wenvoe doesn't transmit on channel
58, and Moel-y-Parc does. How does the name of the transmitter get
carried, and does this mean everyone receiving M-y-P thinks they are
getting signals from Wenvoe?

Cheers!

Matt

I beleive Maplin sell some RF attenuators that could be used to reduce
the signal strength, although this will effect all muxes. I have a
similar problem with a Pioneer DBR-TF100 which gets signals from Winter
Hill and Moel-y-Parc, and screws up BBCi.

That was going to be my suggestion too, but it sounds like the attenuator
would only need to be in for channel learning and then could be removed
for full signal in normal use, or have I misunderstood the OP.
--
fred

That was going to be my suggestion too, but it sounds like the attenuator
would only need to be in for channel learning and then could be removed
for full signal in normal use, or have I misunderstood the OP.

No you've got it right. It can be awkward to find the correct attenuation
value, so use a variable.

Bill

o (Bill) wrote in message ...
That was going to be my suggestion too, but it sounds like the attenuator
would only need to be in for channel learning and then could be removed
for full signal in normal use, or have I misunderstood the OP.

No you've got it right. It can be awkward to find the correct attenuation
value, so use a variable.

Bill

Just as an update, after several days of trying to remove the co-ax at
just the right point, the weather changed and I successfully scanned
just getting the channels that I wanted.

matt