Signal Strength 100%, Quality 0%: Logarithmic-Periodic Antenna Set-Up for DVB-T & Analog Channels

Hello,
I have a logarithmic-periodic antenna (about 7 years old, sample photo)



And I'm trying to set it to be able to receive 1,2,3regionalna channels, Polsat (analog) and DVB-T channels from mux2 (Tarnow or Krakow, I live near Brzesko) on a new TV. And here there is a problem, in the optimal setting the signal strength shown by the TV (LG LV570S) is 100%, while the quality is 0% for digital channels and of course the receiver does not find them. After manually setting the analog channels, they are unstable (i.e. picture seems perfect but flickering all the time and no sound)

I would like to ask for help, what is wrong ...


I corrected the entry and the photos should be pasted as in the recommendations: https://www.elektroda.pl/rtvforum/topic2053101.html.
[SP5ANJ]

And so far you have heard the analogue from Chorągwica on the same antenna?
Do you have it with an amplifier? And he puts his head on.

Once, I also had a problem with her, I ended up exchanging for another one.

Perhaps the signal for the digital decoder is too strong. If the entire antenna path is OK, the analog signals must be razor-blade unless there is a problem with the cable or antenna. Connect another analog TV to this antenna and check the signal quality. If it is very good, the fault is on the side of the new TV, and if not very good (compared to the previous TV), then there is a problem with the antenna system - a damaged connector, cable or a corroded connector in the antenna.

Thank you for the quick reply.


Previously, a Philips TV (cathode ray tube) was connected, and the antenna was still set more or less like now (in Krakow) and I decided to replace it because it received very poor programs (1, 2 on average, and INFO and Polsat were tragic, I thought it was a fault TV).

The antenna has a can with an amplifier, there is no information about the type, etc. (it only writes turbo), of course I bought two other amplifiers (some Philips and SWA-9) but the effect is exactly the same:

with the power supply connected to the amplifier, as I wrote, the channels flicker (but they are perfect) and after removing the power supply from the socket, it only catches TVP 1 and 2 very poorly).


If the antenna was to be replaced, what would you recommend, is it worth packing the antenna for over PLN 100 or is it better to buy something around PLN 50?

Replace the power supply with a voltage regulated one. If it was very weak without an amplifier and distorted with one, you have to "agree" and reduce the output voltage. This should help you receive DVB-T.

An antenna under a tin roof is more or less the same as an antenna buried in a garden 2 meters underground. The metal sheet on the roof suppresses television signals incredibly and only the meager remains reach the antenna placed under it! This is a fundamental and fundamental mistake made in the antenna installation!
An antenna (not only a TV antenna) fulfills its task when it is placed in a free space, away from any metal or other elements that interfere with its operation.
You write that after replacing a few antennas, the effect is still the same. Mounting the antenna under a metal roof is one basic mounting mistake. The second is the lack of an attempt to replace the power supply for the antennas with the amplifier. Very often, the problem is the power supply and not the amplifier itself.
The basis for further activities is to extend the antenna at least 2 meters above the metal roof. It should absolutely do.

Remember that this antenna requires a dedicated amplifier with unbalanced input. The use of the SWA9 amplifier is a mistake, it is an amplifier for symmetrical antennas.
Anyway, in Brzesko the amplifier is completely unnecessary.
A properly functioning antenna must correctly receive analog TVP1 / 2/3 and Polsat and MUX2 from Chorągwica. Additionally, after turning the antenna over to Tarnów, you will have TVP2 / 3 and Polsat as well as MUX2 on channel 23. The latter signal will be more stable and stronger than MUX2 Chorągwica.

You may be right about the power supply, I'll try to buy one with regulated voltage ..
It seems to me that the roof is not a major problem, everything has been fine in recent years.

All entries to be corrected in accordance with the Regulations.
Regulations, point 3.1.13 . [SP5ANJ]

If there is an unsuitable preamplifier there (as noted by Irekr), it is obligatory to remove what is there only harmful.
Either connect the antenna without a preamplifier or buy a suitable one (eg LG-1).

As I know these antennas, it does not go too much to connect another amplifier because the screw spacing does not match, this antenna has a much wider spacing and you would have to combine quite a lot to attach another.

What are you talking about? If it's the antenna in the photo, they are for it dedicated preamplifiers fit perfectly.

Thank you for all your help.

Replacing the amplifier with one with voltage regulation helped.
Now even the analog channels look perfect, I receive the signal from Choręgwica (distance about 60KM).

urban_gk wrote:

Replacing the amplifier with one with voltage regulation helped.
Now even the analog channels look perfect, I receive the signal from Choręgwica (distance about 60KM).

I guess it's a power supply with voltage regulation?

Yes. Power supply, I was wrong.