R Cambridge DAB

[ianb]

My DAB keeps dropping out both with a roof aerial and on portable radio
rod.
Is it general or local interference?

Ian

[tony sayer]

In article <u0gk9h$3bi6l$***@dont-email.me>, ianb <***@ntlworld.com>
scribeth thus

Post by ianb
My DAB keeps dropping out both with a roof aerial and on portable radio
rod.
Is it general or local interference?
Ian

All well here in Trumpington!, what stations are you having problems
with?, all of them or just some, theres there more than the one
multiplex in the area!..

[ianb]

Post by tony sayer
scribeth thus

Post by ianb
My DAB keeps dropping out both with a roof aerial and on portable radio
rod.
Is it general or local interference?
Ian

All well here in Trumpington!, what stations are you having problems
with?, all of them or just some, theres there more than the one
multiplex in the area!..

Living in a CB3 area the local madingley transmitter is being used and
it seems restricted to Radio Cambs

Ian

[David Williams]

Post by ianb

Post by tony sayer
scribeth thus

Post by ianb
My DAB keeps dropping out both with a roof aerial and on portable radio
rod.
Is it general or local interference?
Ian

All well here in Trumpington!, what stations are you having problems
with?, all of them or just some, theres there more than the one
multiplex in the area!..

Living in a CB3 area the local madingley transmitter is being used and
it seems restricted to Radio Cambs
Ian

[David Williams]

Post by ianb

Post by tony sayer
scribeth thus

Post by ianb
My DAB keeps dropping out both with a roof aerial and on portable radio
rod.
Is it general or local interference?
Ian

All well here in Trumpington!, what stations are you having problems
with?, all of them or just some, theres there more than the one
multiplex in the area!..

Living in a CB3 area the local madingley transmitter is being used and
it seems restricted to Radio Cambs

Have you tried the BBC Reception Help? To give a reception prediction, that asks for full postcode and street number. FWIW, I have just tried it for CB24 in Milton and it gave Madingley a clean bill of health on BBC and Commercial multiplexes. I see CB3 extends from almost Bar Hill to Grantchester, subtending pretty much a 180 degree angle at the Madingley mast. I can easily imagine less favoured directions in that area.

What exact symptoms do you see? For example, when I listen in Milton I find Radio 3 and Radio Cambs. DAB are mostly OK in daytime but indicated signal strength starts to drop off somewhere around 16:30 and descends through gurgling audio to stations being untuneable by 18:30. (This was last month and before in GMT; I can't retest just now.) Playing with aerial length and direction helped a bit but I didn't try an interference survey.

It is a digression but listening to FM on a car radio showed me how much an RDS radio will hop frequencies as you move around. I've seen all four plausible transmitters within the city, with Milton Road being a good place to see the shadowing effect of big buildings and double deckers. My record is three frequencies in 15 metres between leaving a parking spot and the first junction.

David

[ianb]

Post by David Williams

Post by ianb

Post by tony sayer
scribeth thus

Post by ianb
My DAB keeps dropping out both with a roof aerial and on portable radio
rod.
Is it general or local interference?
Ian

All well here in Trumpington!, what stations are you having problems
with?, all of them or just some, theres there more than the one
multiplex in the area!..

Living in a CB3 area the local madingley transmitter is being used and
it seems restricted to Radio Cambs

Have you tried the BBC Reception Help? To give a reception prediction, that asks for full postcode and street number. FWIW, I have just tried it for CB24 in Milton and it gave Madingley a clean bill of health on BBC and Commercial multiplexes. I see CB3 extends from almost Bar Hill to Grantchester, subtending pretty much a 180 degree angle at the Madingley mast. I can easily imagine less favoured directions in that area.
What exact symptoms do you see? For example, when I listen in Milton I find Radio 3 and Radio Cambs. DAB are mostly OK in daytime but indicated signal strength starts to drop off somewhere around 16:30 and descends through gurgling audio to stations being untuneable by 18:30. (This was last month and before in GMT; I can't retest just now.) Playing with aerial length and direction helped a bit but I didn't try an interference survey.
It is a digression but listening to FM on a car radio showed me how much an RDS radio will hop frequencies as you move around. I've seen all four plausible transmitters within the city, with Milton Road being a good place to see the shadowing effect of big buildings and double deckers. My record is three frequencies in 15 metres between leaving a parking spot and the first junction.
David

I have just checked again and R 2,R5L,R4 are all ok but although R Cambs
is a strong signal but disappears for a few seconds but than comes back
to full strength. When the sound goes so does the the service 'advert'also

[tony sayer]

In article <u0h5f0$3du9i$***@dont-email.me>, ianb <***@ntlworld.com>
scribeth thus

Post by ianb

Post by tony sayer
scribeth thus

Post by ianb
My DAB keeps dropping out both with a roof aerial and on portable radio
rod.
Is it general or local interference?
Ian

All well here in Trumpington!, what stations are you having problems
with?, all of them or just some, theres there more than the one
multiplex in the area!..

Living in a CB3 area the local madingley transmitter is being used and
it seems restricted to Radio Cambs
Ian

Madingley carries the BBC national MUX thats such as BBC radio's
1,2,3,4,4 odd, 5 live 6 music and Asian and the world service.

Its on channel 12B at 4 Kilowatts radiated.

However BBC radio Cambridgeshire is carried on the Local commercial MUX!
Thats because of the way DAB encoding works the BBC main MUX is put
together in broadcasting house and is fed all over the UK. As Radio
Cambs is a local service its carried on the local commercial service
with other local stations like Star radio at a lower power of 2 K watts
on channel 11C.

There is another MUX the Commercial national D1 that carries such as
Classic, heart, Capital etc.

There is a very local one called "Cambridge small scale DAB" this is for
Cambridge and not much else it comes from two transmitters on the Gogs
and in Coldhams road it carries such as Cambridge 105 , Caroline and
Caroline flashback and the lovely Atlantis all early 1960 tunes!.


There is a a bit of an atmospheric lift on the go at the moment but its
a very marginal thing that may be causing some people problems but as
said its fine here in Trumpington and i checked reception today at a few
locations in Cambridge all fine. Cambridge is hardly full of concrete
canyons but if anyone has had any serious longer term troubles that may
be something very local causing and interference problem some of those
poxy power line plugs can an do cause that problem then BBC did an
engineering paper on it a while ago.

I'll drop Arqiva at Emily moor a line and ask them if they have been
having any issues as the BBC don't own the transmitters anymore its all
contracted out to Arqiva these days!..

https://www.dxinfocentre.com/tropo_eur.html


If you suspect power line adapters this may help if this link doesn't
work goggle the bit below on WHP 195!

https://www.google.com/search?client=firefox-b-d&q=BBC+white+paper+on+po
wer+line+adaptors&spell=1&sa=X&ved=2ahUKEwi05L_z5JD-AhWCWMAKHWWNCRgQkeEC
KAB6BAghEAE


BBC R&D research paper WHP 195

[ianb]

Post by tony sayer
scribeth thus

Post by ianb

Post by tony sayer
scribeth thus

Post by ianb
My DAB keeps dropping out both with a roof aerial and on portable radio
rod.
Is it general or local interference?
Ian

All well here in Trumpington!, what stations are you having problems
with?, all of them or just some, theres there more than the one
multiplex in the area!..

Living in a CB3 area the local madingley transmitter is being used and
it seems restricted to Radio Cambs
Ian

Madingley carries the BBC national MUX thats such as BBC radio's
1,2,3,4,4 odd, 5 live 6 music and Asian and the world service.
Its on channel 12B at 4 Kilowatts radiated.
However BBC radio Cambridgeshire is carried on the Local commercial MUX!
Thats because of the way DAB encoding works the BBC main MUX is put
together in broadcasting house and is fed all over the UK. As Radio
Cambs is a local service its carried on the local commercial service
with other local stations like Star radio at a lower power of 2 K watts
on channel 11C.
There is another MUX the Commercial national D1 that carries such as
Classic, heart, Capital etc.
There is a very local one called "Cambridge small scale DAB" this is for
Cambridge and not much else it comes from two transmitters on the Gogs
and in Coldhams road it carries such as Cambridge 105 , Caroline and
Caroline flashback and the lovely Atlantis all early 1960 tunes!.
There is a a bit of an atmospheric lift on the go at the moment but its
a very marginal thing that may be causing some people problems but as
said its fine here in Trumpington and i checked reception today at a few
locations in Cambridge all fine. Cambridge is hardly full of concrete
canyons but if anyone has had any serious longer term troubles that may
be something very local causing and interference problem some of those
poxy power line plugs can an do cause that problem then BBC did an
engineering paper on it a while ago.
I'll drop Arqiva at Emily moor a line and ask them if they have been
having any issues as the BBC don't own the transmitters anymore its all
contracted out to Arqiva these days!..
https://www.dxinfocentre.com/tropo_eur.html
If you suspect power line adapters this may help if this link doesn't
work goggle the bit below on WHP 195!
https://www.google.com/search?client=firefox-b-d&q=BBC+white+paper+on+po
wer+line+adaptors&spell=1&sa=X&ved=2ahUKEwi05L_z5JD-AhWCWMAKHWWNCRgQkeEC
KAB6BAghEAE
BBC R&D research paper WHP 195

Well it seems to be working normally since yesterday evening and seems
ok today.

Ian

[ianb]

Post by ianb

Post by tony sayer
scribeth thus

Post by ianb

Post by tony sayer
scribeth thus

Post by ianb
My DAB keeps dropping out both with a roof aerial and on portable radio
rod.
Is it general or local interference?
Ian

All well here in Trumpington!, what stations are you having problems
with?,  all of them or just some, theres there more than the one
multiplex in the area!..

Living in a CB3 area the local madingley transmitter is being used and
it seems restricted to Radio Cambs
Ian

Madingley carries the BBC national MUX thats such as BBC radio's
1,2,3,4,4 odd, 5 live 6 music and Asian and the world service.
Its on channel 12B at 4 Kilowatts radiated.
However BBC radio Cambridgeshire is carried on the Local commercial MUX!
Thats because of the way DAB encoding works the BBC main MUX is put
together in broadcasting house and is fed all over the UK. As Radio
Cambs is a local service its carried on the local commercial service
with other local stations like Star radio at a lower power of 2 K watts
on channel 11C.
There is another MUX the Commercial national D1 that carries such as
Classic, heart, Capital etc.
There is a very local one called "Cambridge small scale DAB" this is for
Cambridge and not much else it comes from two transmitters on the Gogs
and in Coldhams road it carries such as Cambridge 105 , Caroline and
Caroline flashback and the lovely Atlantis all early 1960 tunes!.
There is a a bit of an atmospheric lift on the go at the moment but its
a very marginal thing that may be causing some people problems but as
said its fine here in Trumpington and i checked reception today at a few
locations in Cambridge all fine. Cambridge is hardly full of concrete
canyons but if anyone has had any serious longer term troubles that may
be something very local causing and interference problem some of those
poxy power line plugs can an do cause that problem then BBC did an
engineering paper on it a while ago.
I'll drop Arqiva at Emily moor a line and ask them if they have been
having any issues as the BBC don't own the transmitters anymore its all
contracted out to Arqiva these days!..
https://www.dxinfocentre.com/tropo_eur.html
If you suspect power line adapters this may help if this link doesn't
work goggle the bit below on WHP 195!
https://www.google.com/search?client=firefox-b-d&q=BBC+white+paper+on+po
wer+line+adaptors&spell=1&sa=X&ved=2ahUKEwi05L_z5JD-AhWCWMAKHWWNCRgQkeEC
KAB6BAghEAE
BBC R&D research paper WHP 195

Well it seems to be working normally since yesterday evening and seems
ok today.
Ian

MY neighbour has recently obtained a hybrid Mini which he charges at
home, could this have been the cause?

Ian

[tony sayer]

In article <u10e1a$23ivb$***@dont-email.me>, ianb <***@ntlworld.com>
scribeth thus

Post by ianb

Post by ianb

Post by tony sayer
scribeth thus

Post by ianb

Post by tony sayer
scribeth thus

Post by ianb
My DAB keeps dropping out both with a roof aerial and on portable radio
rod.
Is it general or local interference?
Ian

All well here in Trumpington!, what stations are you having problems
with?,  all of them or just some, theres there more than the one
multiplex in the area!..

Living in a CB3 area the local madingley transmitter is being used and
it seems restricted to Radio Cambs
Ian

Madingley carries the BBC national MUX thats such as BBC radio's
1,2,3,4,4 odd, 5 live 6 music and Asian and the world service.
Its on channel 12B at 4 Kilowatts radiated.
However BBC radio Cambridgeshire is carried on the Local commercial MUX!
Thats because of the way DAB encoding works the BBC main MUX is put
together in broadcasting house and is fed all over the UK. As Radio
Cambs is a local service its carried on the local commercial service
with other local stations like Star radio at a lower power of 2 K watts
on channel 11C.
There is another MUX the Commercial national D1 that carries such as
Classic, heart, Capital etc.
There is a very local one called "Cambridge small scale DAB" this is for
Cambridge and not much else it comes from two transmitters on the Gogs
and in Coldhams road it carries such as Cambridge 105 , Caroline and
Caroline flashback and the lovely Atlantis all early 1960 tunes!.
There is a a bit of an atmospheric lift on the go at the moment but its
a very marginal thing that may be causing some people problems but as
said its fine here in Trumpington and i checked reception today at a few
locations in Cambridge all fine. Cambridge is hardly full of concrete
canyons but if anyone has had any serious longer term troubles that may
be something very local causing and interference problem some of those
poxy power line plugs can an do cause that problem then BBC did an
engineering paper on it a while ago.
I'll drop Arqiva at Emily moor a line and ask them if they have been
having any issues as the BBC don't own the transmitters anymore its all
contracted out to Arqiva these days!..
https://www.dxinfocentre.com/tropo_eur.html
If you suspect power line adapters this may help if this link doesn't
work goggle the bit below on WHP 195!
https://www.google.com/search?client=firefox-b-d&q=BBC+white+paper+on+po
wer+line+adaptors&spell=1&sa=X&ved=2ahUKEwi05L_z5JD-AhWCWMAKHWWNCRgQkeEC
KAB6BAghEAE
BBC R&D research paper WHP 195

Well it seems to be working normally since yesterday evening and seems
ok today.
Ian

MY neighbour has recently obtained a hybrid Mini which he charges at
home, could this have been the cause?
Ian

Might be, the only way to find out is to do a small experiment with the
charger on and off and see what results.

It maybe that the charger is radiating something thats not meeting the
regulatory standards and it could be radiating something on one
frequency and not another this affecting one multiplex and not the
other/s!..