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[Marks DTM Calib]

Just attenuate the aerial signal just before the reception point.....as long as there is no MRD then you cant exactly over drive the cable!

And beware of being close to transmitters....the elements dont transmit down very well from the high masts (the actual UHF element will eb right at the top insdie the white fibreglass casing) and you get a shadow around the base a few miles in diameter....here you end up picking up reflections rather than a direct signal.

[Martin_1962]

Shielded cable as far as I am concerned is a must, any amplication must be loft based but you can also have too much boosting.

My install (paid for) was an early digital setup at the limits of Sutton Coldfield.

Large wideband on the peak of the roof, then CT100 to the amp, CT100 downlead to the PSU, then CT100 leads to all appliances.

The postcode checkers so no reception - no problem here with 8 different digital tuners over the years.

[Martin_1962]

Shielded cable as far as I am concerned is a must, any amplication must be loft based but you can also have too much boosting.

My install (paid for) was an early digital setup at the limits of Sutton Coldfield.

Large wideband on the peak of the roof, then CT100 to the amp, CT100 downlead to the PSU, then CT100 leads to all appliances.

The postcode checkers so no reception - no problem here with 8 different digital tuners over the years.

BTW my installers were the first in the area to do digital installations, and got a mention in the press (CAS)

[Marks DTM Calib]

Shielded cable as far as I am concerned is a must, any amplication must be loft based but you can also have too much boosting.

My install (paid for) was an early digital setup at the limits of Sutton Coldfield.

Large wideband on the peak of the roof, then CT100 to the amp, CT100 downlead to the PSU, then CT100 leads to all appliances.

The postcode checkers so no reception - no problem here with 8 different digital tuners over the years.

All coax is shielded......its just the quality that varies....

[Marks DTM Calib]

And as said, there is no such thing as a digital install.....only a good analogue one!

[dippydave]

Just attenuate the aerial signal just before the reception point.....as long as there is no MRD then you cant exactly over drive the cable!

And beware of being close to transmitters....the elements dont transmit down very well from the high masts (the actual UHF element will eb right at the top insdie the white fibreglass casing) and you get a shadow around the base a few miles in diameter....here you end up picking up reflections rather than a direct signal.

  you mean hopefully i didnt fit one of these? http://www.tlc-direct.co.uk/Products/MXMRD.html

woops!

although it reads like it won't do anything unless it's powered up from below.

oh i'm gonna have fun when i switch it on eventually!

[amigov6]

WOW!!!! I'm just happy that mine works regardless of why.

[Martin_1962]

Shielded cable as far as I am concerned is a must, any amplication must be loft based but you can also have too much boosting.

My install (paid for) was an early digital setup at the limits of Sutton Coldfield.

Large wideband on the peak of the roof, then CT100 to the amp, CT100 downlead to the PSU, then CT100 leads to all appliances.

The postcode checkers so no reception - no problem here with 8 different digital tuners over the years.

All coax is shielded......its just the quality that varies....

Hence mine using CT100 rather than the cheap brown stuff

[Marks DTM Calib]

Just attenuate the aerial signal just before the reception point.....as long as there is no MRD then you cant exactly over drive the cable!

And beware of being close to transmitters....the elements dont transmit down very well from the high masts (the actual UHF element will eb right at the top insdie the white fibreglass casing) and you get a shadow around the base a few miles in diameter....here you end up picking up reflections rather than a direct signal.

  you mean hopefully i didnt fit one of these? http://www.tlc-direct.co.uk/Products/MXMRD.html

woops!

although it reads like it won't do anything unless it's powered up from below.

oh i'm gonna have fun when i switch it on eventually!

If not powered, it wont be an issue.

[Marks DTM Calib]

Shielded cable as far as I am concerned is a must, any amplication must be loft based but you can also have too much boosting.

My install (paid for) was an early digital setup at the limits of Sutton Coldfield.

Large wideband on the peak of the roof, then CT100 to the amp, CT100 downlead to the PSU, then CT100 leads to all appliances.

The postcode checkers so no reception - no problem here with 8 different digital tuners over the years.

All coax is shielded......its just the quality that varies....

Hence mine using CT100 rather than the cheap brown stuff

Which will help avoid multipath and interference from external noise sources....but as said, not essential for 99% of installs

[Martin_1962]

And as said, there is no such thing as a digital install.....only a good analogue one!

Actually there is a difference, but the equipment is the same.

A good analogue install relies on having a grouped aerial to get the 4 channels, the 6 multiplexes usually require a wide band.

One thing around here I do not think there is a spare RF channel anywhere.

Off top of head
40 43 46 50 analogue
41 44 47 51 52 55 digital - Mux D is out of band

[Martin_1962]

Shielded cable as far as I am concerned is a must, any amplication must be loft based but you can also have too much boosting.

My install (paid for) was an early digital setup at the limits of Sutton Coldfield.

Large wideband on the peak of the roof, then CT100 to the amp, CT100 downlead to the PSU, then CT100 leads to all appliances.

The postcode checkers so no reception - no problem here with 8 different digital tuners over the years.

All coax is shielded......its just the quality that varies....

Hence mine using CT100 rather than the cheap brown stuff

Which will help avoid multipath and interference from external noise sources....but as said, not essential for 99% of installs

With the price of it - not worth not using decent cable, and around here you need decent cable - no really strong TXes

[Marks DTM Calib]

And as said, there is no such thing as a digital install.....only a good analogue one!

Actually there is a difference, but the equipment is the same.

A good analogue install relies on having a grouped aerial to get the 4 channels, the 6 multiplexes usually require a wide band.

One thing around here I do not think there is a spare RF channel anywhere.

Off top of head
40 43 46 50 analogue
41 44 47 51 52 55 digital - Mux D is out of band

Nope....thats no difference.....a good analogue aerial would also be wide band...the only benefit of a grouped aerial is fractionaly higher gain and thats not requried with a good wide band aerial. In fact a good installer is unlikely to have a grouped aerial on the van for most domestic installs particularly since the advent of channel 5



Hence yet again....this digital aerial thing is a markting con.

There cant be such a thing a a digital aerial....as RF does not propogate as a digital signal...its analogue.

[Marks DTM Calib]

Shielded cable as far as I am concerned is a must, any amplication must be loft based but you can also have too much boosting.

My install (paid for) was an early digital setup at the limits of Sutton Coldfield.

Large wideband on the peak of the roof, then CT100 to the amp, CT100 downlead to the PSU, then CT100 leads to all appliances.

The postcode checkers so no reception - no problem here with 8 different digital tuners over the years.

All coax is shielded......its just the quality that varies....

Hence mine using CT100 rather than the cheap brown stuff

Which will help avoid multipath and interference from external noise sources....but as said, not essential for 99% of installs

With the price of it - not worth not using decent cable, and around here you need decent cable - no really strong TXes

There is major issue with CT100 in domestic installs though....and that is its minimum bend radius of 70mm......its almost impossible to compelte a neat install without going against this....and doing so crushes the internals badly and negates any benefits. Further to this, there are some real cheap versions about with steel central core and aluminium foil rather than the all coper stuff.

[Andy B]

Do you fancy coming round our house & sorting out my aerial then please Mark?