why reception change

Cannot understand why at lets say 10 pm
I have great recepton at most of my channels and I turn the tv off.
Nothing is touched and a 5 pm turn on the set and many of the channel
that came in at 10 now show "weak" or "no signal".

(I live 13 miles east of manhattam)

alkem

wrote:
Cannot understand why at lets say 10 pm
I have great recepton at most of my channels and I turn the tv off.
Nothing is touched and a 5 pm turn on the set and many of the channel
that came in at 10 now show "weak" or "no signal".

(I live 13 miles east of manhattam)

The atmospheric conditions responsible for propagating signals do change as the layers heat and cool.

But at a distance of only 13 miles I doubt that's causing your problem.

I suspect you have a local interference source that's being turned on at a given time. Advertising sign, defective flourescent light, someone coming
home from work and turning on the computer, something like that.

--

Doug Smith W9WI
Pleasant View, TN EM66

On 07/29/09 02:29 AM, wrote:
Cannot understand why at lets say 10 pm
I have great recepton at most of my channels and I turn the tv off.
Nothing is touched and a 5 pm turn on the set and many of the channel
that came in at 10 now show "weak" or "no signal".

(I live 13 miles east of manhattam)

alkem


Your TV receiver may work better after it has "warmed up".
Try turning the set on before 5 PM or leave it on all day.

"jAk" wrote in message
...
On 07/29/09 02:29 AM, wrote:
Cannot understand why at lets say 10 pm
I have great recepton at most of my channels and I turn the tv off.
Nothing is touched and a 5 pm turn on the set and many of the channel
that came in at 10 now show "weak" or "no signal".

(I live 13 miles east of manhattam)

alkem


Your TV receiver may work better after it has "warmed up".
Try turning the set on before 5 PM or leave it on all day.



Hmmm.....yes, those vacuum tubes do take awhile.....

I don't know the story in NY, but here near San Francisco they turn the
power down by day to protect workers on the transmitting tower.

Hi,

So far they have not done this except to check out the antennas low down
which cannot handle all the power to the antennas that have been in use
for many years.

They need to use the lower down antennas as you said to protect the workers
while the old analog antennas at the top are replaced by new ones. One
station, KGO Ch 7, PSIP =7 is using it's new antenna at the top some of the
time.

They have done a lot of work already without resorting to the auxiliary
antennas.

See this and following posts.

http://www.avsforum.com/avs-vb/showt...1#post16890411

We here in the S.F. Bay area have a lot of problems due to mountains around
the edges and fog coming in though the Golden Gate.

SUTRO TOWER - Official Site of Sutro Tower, Inc.

http://sutrotower.com/

As sorry-spammers wrote:

"The atmospheric conditions responsible for propagating signals do change as
the layers heat and cool."

Is the largest problem as both the direct path and the multipath can be
affected.

SHF


"QN" wrote in message
...
I don't know the story in NY, but here near San Francisco they turn the
power down by day to protect workers on the transmitting tower.