Power on freeview

[ericmark]

The signal is 1000% stronger.

Well, 900% actually.

The strength of a signal is logarithmic compared with power

Define 'strength of a signal'.

I would say that we use a logarithmic scale for signal strength because the enormous range of signal powers which can be resolved by a communications receiver could not be adequately registered on a linear meter.

G4M**

Thank you "Old Man" that was my point. If you can receive 10dbw at 10 mile then 20dbw at 20 mile and 40dbw at 40 mile. So with 50dbw instead of 40dbw you should be able to go 25% further away from transmitter or use a 25% less gain on ones aerial.

And there have been enough links on this site from time to time to find my web site and does not require call sign to find it my name is good enough in full of course.

 

[KingboyD]

So based on this increase of Winter Hill, should I get my aerial sorted now as I cant get Mux 1 (BBC) with any quality or should I just wait

 

[Spark123]

Don't know, but I can get BBC OK from Winter Hill up here in Cumbria. I am about on the limit for Winter Hill (50miles as the crow flies), those a few miles further north are in the Border Region and have already switched over to digital.
I got a new aerial and a mast head amplifier late last year in order to get a decent signal, also as our local transmitter apart from breaking down half the time doesn't have freeview.

 

[Spark123]

Thank you "Old Man" that was my point. If you can receive 10dbw at 10 mile then 20dbw at 20 mile and 40dbw at 40 mile. So with 50dbw instead of 40dbw you should be able to go 25% further away from transmitter or use a 25% less gain on ones aerial.

If I am currently getting a 10dBw and after they turn up the amplifier gain by 10dB I get 20dBw, I have 10x greater signal than I had before.

 

[electronicsuk]

Thank you "Old Man" that was my point. If you can receive 10dbw at 10 mile then 20dbw at 20 mile and 40dbw at 40 mile. So with 50dbw instead of 40dbw you should be able to go 25% further away from transmitter or use a 25% less gain on ones aerial.

Again, you're assuming a linear link between transmit power and transmission distance. A 6dB increase in Tx power (which, in multiple terms, would be a 4x increase in EIRP) will double the effective transmission distance. So, if 10dBw will get you 10 miles, 20dBw would get you around 35 miles as a very rough back-of-the-imaginary-fag-packet calculation.

 

[ericmark]

So based on this increase of Winter Hill, should I get my aerial sorted now as I cant get Mux 1 (BBC) with any quality or should I just wait

Wait the power is going up. My point was academic and more to do with wording than real facts. They are using 10 times the power but because of loses when it reaches you it is not 10 times stronger but it is stronger and that is all that really matters.

If I lift my power from 2.5W to 25W my signal does not go 10 times further but it does go further and radio signals are not that predictable anyway and on 25W I have talked into Scandinavia from Suffolk on 144Mhz SSB with a 5 and 9 report yet normally I would have a job doing 25 miles.

I was using something called Sporadic E and it is the varying conditions which is downfall of the digital TV as with analogue weather conditions may produce poor picture either because signal is reduced or because a signal from another station is enhanced but you can still make out what is going on but with digital TV it works or fails with no in between.

 

[KingboyD]

With the assistance of Google Earth im 25.1 miles from Winter Hill Usless fact of the night there.

 

[ericmark]

Seems I am 60 miles away. Old aerial still works though.