Could someone please tell be where I could find the recommended RF min
and max levels at the TV for analogue and digital TV? Also the
recommended IF levels for digital satellite.

TIa

-- 
Ashley
For Windsor Weather see www.snglinks.com/wx

"Ashley Booth"  wrote in message 
news:cLOdne4PjqnCD_PVnZ2dnUVZ8hmdnZ2d@bt.com...
>
> Could someone please tell be where I could find the recommended RF min
> and max levels at the TV for analogue and digital TV? Also the
> recommended IF levels for digital satellite.

I could start quoting numbers at you, but I envisage problems.

1. Signal levels per se are only one factor. The signal/noise ratio is 
vitally important, so simply setting out to achieve a certain signal level 
at each outlet is not good enough.

2. Any levels I mention will be hotly disputed by others, including those 
who will cite 'official' figures that differ from mine. It is also possible 
that someone will dig up figures I have quoted in the distant past, which 
will contradict those I mention now. Did you know that severe hayfever 
combined with skin so sore it makes your eyes water can bring on paranoia as 
well as grumpyness?

3. In these days of fairly bombproof tuners maximum figures are becoming a 
bit of an irrelevance, since most tuners will handle far more signal than 
you'd ever be likely to throw at them (unless you did something daft). The 
ratio between adjacent digi and analogue signals is of more interest.

4. Different tuners react differently when presented with low signal levels 
that have a good s/n ratio, by quite a large margin.

Bill

On Fri, 04 Jul 2008 16:13:03 -0500, Ashley Booth wrote:

> Could someone please tell be where I could find the recommended RF min
> and max levels at the TV for analogue and digital TV?

The guy who came round to sort out my UHF TV aerial the other month
thought a minimum of 43 dB and a maximum of 65 dB over a microvolt were
the figures to go for in digital terrestrial TV.

There is a lone Citroen 2CV that regularly haunts my neighbourhood and
which prompted the aerial replacement. A signal strength of around 60dB/uV
together with lap-screen coax has mercifully eliminated the nusiance it 
caused.

Gareth

-- 
gareth at lightfox dot plus dot com

On 05/07/2008 16:06, Gareth wrote:

> There is a lone Citroen 2CV that regularly haunts my neighbourhood and
> which prompted the aerial replacement.

If only 2CVs didn't have those dinner-plate wheels, you could have poked 
a stick into its spokes as it passed and done away with it :-P

Ashley Booth wrote:
> Could someone please tell be where I could find the recommended RF min
> and max levels at the TV for analogue and digital TV? Also the
> recommended IF levels for digital satellite.

Where?  IEC 60728-1:2007 is the recently updated international standard. 
  The EN version of this will replace EN 50083-7, if it hasn't already. 
  BSI don't seem to have published the BS EN version yet, but it's on 
its way (BS EN 60728-1:2008).  There are also recommendations for UK use 
in DTG R-book 5.

The IEC standard is very wide-ranging and I'll only quote figures 
relevant to systems used in the UK:

1. Data from IEC 60728-1:2007 - outlet plate levels in dBuV and C/N in dB

.                   Levels      Min.
Service            Min.  Max.   C/N
-----------------  ----  ----   ----
FM radio (stereo)   50    70     48
DAB (BIII)          28    94     not given
DTT 16-QAM 3/4      39    74     22 (2K mode) 23 (8K mode)
DTT 64-QAM 2/3      45    74     26 (2K)      27 (8K)
ATT System I        57    80     44
DST DVB-S           47    77     12.8 (rate 2/3) 14.9 (rate 5/6)


2. Data from DTG R-book 5 (also used by Sky Homes)

.                   Levels      Min.
Service            Min.  Max.   C/N
-----------------  ----  ----   ----
FM radio (stereo)   54    74     45
DAB (BIII)          30    70     18
DTT 16-QAM 3/4      45    65     23
DTT 64-QAM 2/3      45    65     26
ATT System I        60    80     43
DST DVB-S           52    77     12


Take your pick. . .

HTH
-- 
Andy

Andy Wade wrote:

> Ashley Booth wrote:
> > Could someone please tell be where I could find the recommended RF
> > min and max levels at the TV for analogue and digital TV? Also the
> > recommended IF levels for digital satellite.
> 
> Where?  IEC 60728-1:2007 is the recently updated international
> standard.   The EN version of this will replace EN 50083-7, if it
> hasn't already.   BSI don't seem to have published the BS EN version
> yet, but it's on its way (BS EN 60728-1:2008).  There are also
> recommendations for UK use in DTG R-book 5.
> 
> The IEC standard is very wide-ranging and I'll only quote figures
> relevant to systems used in the UK:
> 
> 1. Data from IEC 60728-1:2007 - outlet plate levels in dBuV and C/N
> in dB
> 
> .                   Levels      Min.
> Service            Min.  Max.   C/N
> -----------------  ----  ----   ----
> FM radio (stereo)   50    70     48
> DAB (BIII)          28    94     not given
> DTT 16-QAM 3/4      39    74     22 (2K mode) 23 (8K mode)
> DTT 64-QAM 2/3      45    74     26 (2K)      27 (8K)
> ATT System I        57    80     44
> DST DVB-S           47    77     12.8 (rate 2/3) 14.9 (rate 5/6)
> 
> 
> 2. Data from DTG R-book 5 (also used by Sky Homes)
> 
> .                   Levels      Min.
> Service            Min.  Max.   C/N
> -----------------  ----  ----   ----
> FM radio (stereo)   54    74     45
> DAB (BIII)          30    70     18
> DTT 16-QAM 3/4      45    65     23
> DTT 64-QAM 2/3      45    65     26
> ATT System I        60    80     43
> DST DVB-S           52    77     12
> 
> 
> Take your pick. . .
> 
> HTH

Thats for this information. I'll print it out and stick it in my Promax
case.

-- 
Ashley
For Windsor Weather see www.snglinks.com/wx

On Wed, 09 Jul 2008 05:34:50 -0500, "Ashley Booth"
 wrote:

>Andy Wade wrote:
>
>> Ashley Booth wrote:
>> > Could someone please tell be where I could find the recommended RF
>> > min and max levels at the TV for analogue and digital TV? Also the
>> > recommended IF levels for digital satellite.
>> 
>> Where?  IEC 60728-1:2007 is the recently updated international
>> standard.   The EN version of this will replace EN 50083-7, if it
>> hasn't already.   BSI don't seem to have published the BS EN version
>> yet, but it's on its way (BS EN 60728-1:2008).  There are also
>> recommendations for UK use in DTG R-book 5.
>> 
>> The IEC standard is very wide-ranging and I'll only quote figures
>> relevant to systems used in the UK:
>> 
>> 1. Data from IEC 60728-1:2007 - outlet plate levels in dBuV and C/N
>> in dB
>> 
>> .                   Levels      Min.
>> Service            Min.  Max.   C/N
>> -----------------  ----  ----   ----
>> FM radio (stereo)   50    70     48
>> DAB (BIII)          28    94     not given
>> DTT 16-QAM 3/4      39    74     22 (2K mode) 23 (8K mode)
>> DTT 64-QAM 2/3      45    74     26 (2K)      27 (8K)
>> ATT System I        57    80     44
>> DST DVB-S           47    77     12.8 (rate 2/3) 14.9 (rate 5/6)
>> 
>> 
>> 2. Data from DTG R-book 5 (also used by Sky Homes)
>> 
>> .                   Levels      Min.
>> Service            Min.  Max.   C/N
>> -----------------  ----  ----   ----
>> FM radio (stereo)   54    74     45
>> DAB (BIII)          30    70     18
>> DTT 16-QAM 3/4      45    65     23
>> DTT 64-QAM 2/3      45    65     26
>> ATT System I        60    80     43
>> DST DVB-S           52    77     12
>> 
>> 
>> Take your pick. . .
>> 
>> HTH
>
>Thats for this information. I'll print it out and stick it in my Promax
>case.

I have Bill's figures in my meter's case :-)

Marky P.

"Marky P"  wrote in message 
news:am8a7492th0atjibnkvcv3cftnnb4m84ai@4ax.com...
> On Wed, 09 Jul 2008 05:34:50 -0500, "Ashley Booth"
> I have Bill's figures in my meter's case :-)
>
> Marky P.

Oh can I have a copy? I've lost mine.

Only joking.

Bill