UHF/VHF
 

Kind of off topic, but I know someone in here can help me. I have a
VHF/UHF TV antenna that is about a year old. I always got great
reception with it, but now my VHF reception is horrible while my UHF
reception is still good. Anyone have any ideas? I have tried
replacing the cable and re-grounded the antenna but the problem
remains. It seems to have been getting worse and worse over the last
few months.

Thanks,
Dan
KE5BCC

Have you visually inspected the antenna itself for either broken
elements or the phasing line that connects the coax to the antemma
elements. I would start there...

Scott
N0EDV


Dan wrote:
Kind of off topic, but I know someone in here can help me. I have a
VHF/UHF TV antenna that is about a year old. I always got great
reception with it, but now my VHF reception is horrible while my UHF
reception is still good. Anyone have any ideas? I have tried
replacing the cable and re-grounded the antenna but the problem
remains. It seems to have been getting worse and worse over the last
few months.

Thanks,
Dan
KE5BCC

I did inspect the antenna. Nothing appears to be broken. I even
changed out and reattached the matching transformer.

Dan


Scott wrote in message .. .
Have you visually inspected the antenna itself for either broken
elements or the phasing line that connects the coax to the antemma
elements. I would start there...

Scott
N0EDV


Dan wrote:
Kind of off topic, but I know someone in here can help me. I have a
VHF/UHF TV antenna that is about a year old. I always got great
reception with it, but now my VHF reception is horrible while my UHF
reception is still good. Anyone have any ideas? I have tried
replacing the cable and re-grounded the antenna but the problem
remains. It seems to have been getting worse and worse over the last
few months.

Thanks,
Dan
KE5BCC

On 1 May 2004 09:13:57 -0700, (Dan) wrote:

I did inspect the antenna. Nothing appears to be broken. I even
changed out and reattached the matching transformer.

Dan

Hi Dan,

Then it is time to look at the other end. There are usually separate
paths to the VHF and UHF tuners - although this may have been
obsoleted in the years since I've bought a TV. As such, the VHF tuner
may have been zapped. There may also be a splitter involved or other
pathing issue. Try substituting another TV to confirm it is in fact
the antenna system at fault.

73's
Richard Clark, KB7QHC

"Dan" wrote in message
m...
I did inspect the antenna. Nothing appears to be broken. I even
changed out and reattached the matching transformer.

Look for a pulled out center conductor in the cable.
You're describing something that's acting like a capacitor in series with
the line, passing higher frequencies better than lower ones.

Also, most antennas like this have a UHF and a VHF section, there may be
some mechanical problem with the VHF section, even if you can't see it from
the ground.

Ah, good point! I was fixated on the antenna end when I offered up
advice to Dan. Being that it has been getting worse GRADUALLY, you have
a very good point...may be in the TV tuner itself. Hate when THAT happens!

Scott
N0EDV


Richard Clark wrote:
On 1 May 2004 09:13:57 -0700, (Dan) wrote:


I did inspect the antenna. Nothing appears to be broken. I even
changed out and reattached the matching transformer.

Dan


Hi Dan,

Then it is time to look at the other end. There are usually separate
paths to the VHF and UHF tuners - although this may have been
obsoleted in the years since I've bought a TV. As such, the VHF tuner
may have been zapped. There may also be a splitter involved or other
pathing issue. Try substituting another TV to confirm it is in fact
the antenna system at fault.

73's
Richard Clark, KB7QHC