Testing Coaxial Cable and Antenna: Using Multimeter for Diode Test & Assessing DVB-T Reception

Hello.
What does the coaxial cable check look like?
Can I check it with a multimeter set to the diode (i.e. at one end I connect the multimeter: plus to the minus cable to the screen, at the other end I twist the screen with the cable).
It seems to me that in this configuration I should have a short circuit if the wire is good, if the wire is damaged there is no current flow (resistance infinitely great)
And the second question is how to check the antenna and the plate in the antenna, is it working?
I have a problem with the reception of dvb-t television.

Check the antenna power supply, it is possible that the charger has broken in it, and then you can forget about DVBT.

Konrad_M wrote:

Can I check it with a multimeter set to the diode (i.e. at one end I connect the multimeter: plus to the minus cable to the screen, at the other end I twist the screen with the cable). It seems to me that in this configuration I should have a short circuit if the wire is good, if the wire is damaged there is no current flow (resistance infinitely great)

But the cable transmits different frequencies under different weather conditions, measuring it this way will not tell you anything.

Konrad_M wrote:

And the second question is how to check the antenna and the plate in the antenna, is it working?

If the antenna is hanging, and it is complete, all you can do to determine if it is good, as for the plate, yourself, the easiest way is to replace it with a new one.

Konrad_M wrote:

I have a problem with the reception of dvb-t television

And I really like strawberries ....
What, how, what, what antenna, installation, what transmitter you use, where you live, apartment or your own house, what cable exactly, its name.
Because for now, it's your fault that the subject is trash !.

The wa-501 s-3 amplifier sits in the antenna, the voltage on the power supply is 11.58V. Plain mesh antenna.
I live in the village of Janików, Mazowieckie Voivodeship, Kozłowiec transmitter near Przysucha, I live in a single-family house, two antennas on the balcony on a metal post.

Konrad_M wrote:

The wa-501 s-3 amplifier sits in the antenna

Replace.

Konrad_M wrote:

The voltage on the power supply is constant 11.58V

Where measured ?.

Konrad_M wrote:

Plain mesh antenna

It is whole, it has all the elements, not rusty, the antenna box is intact and dry, the ends of the cable are not rusty ...?.

Konrad_M wrote:

two antennas on the balcony on a metal pillar

And nothing works under both of them, how, what are they combined with?

Jerzykowski wrote:

Check that there is voltage at the cable entering the antenna.

Yes there is tension

KOCUREK1970 wrote:

Konrad_M wrote:
The voltage on the power supply is constant 11.58V

Where measured ?.

Measured in the antenna plug entering the decoder in the place where the power supply wires are soldered. The voltage entering the antenna is the same

The antenna was a bit rusty, but I saw worse, the can inside is dry on top, not necessarily

KOCUREK1970 wrote:

And nothing works for both of them, how, what are they combined with?

One TV is connected to one antenna and the other one. Until now, everything worked, sometimes better, sometimes worse (frequent problems and interference), today in one TV there was the inscription no signal from the antenna (on all programs), I moved the antenna and the same appeared on the other TV and I could not do anything about it.
I thought that when I moved the antenna, these frozen wires broke (but the current is conducted so I don't think so)
What plate should I insert?
Maybe replace the antenna with a directional one?

since you have a meter
1. check with the setting for 20V DC, is 12V coming out of the power supply?
2. check with the setting for 2V AC that 0.02V is coming out of the power supply
* value greater than 0.02 will indicate a problem with voltage filtering.

Have you tried to search for channels again?
Does it find a multiplex at all?

Konrad_M wrote:

Jerzykowski wrote:


Check that there is voltage at the cable entering the antenna.
Yes there is tension

Konrad_M wrote:

Measured in the antenna plug entering the decoder in the place where the power supply wires are soldered.

So theoretically !, cable fault can be ruled out.

Konrad_M wrote:

One TV is connected to one antenna and the other one

Throw out one of the worst ones, put on a splitter at home and connect both TVs to this one antenna.

Konrad_M wrote:

So far, everything has worked, sometimes for better and for worse (frequent problems and disruptions

Probably the two antennas are 20 cm apart, the "firecracker" antenna amplifier, so no wonder it happened like that.

Konrad_M wrote:

I thought that when I moved the antenna, these frozen wires broke (but the current is conducted so I don't think so)

Is the cable intact, or is it broken somewhere?

Konrad_M wrote:

What plate should I insert?

What is the exact distance in a straight line to your transmitter?
The transmitter itself has a power of 100 kW, so even for 100 HP, an antenna balun is enough, no amplifier, no power supply needed!

Elektronik223 wrote:

1. check with the setting for 20V DC, is 12V coming out of the power supply?
2. check with the setting for 2V AC that 0.02V is coming out of the power supply
* value greater than 0.02 will indicate a problem with voltage filtering.

On DC it shows 11.58V as I wrote above
Whereas AC 0.00V So ideal filtering, is it?

budiet wrote:

Have you tried to search for channels again?
Does it find any multiplex at all?

No, because sometimes it catches something for a while and the signal from the antenna is 0-1%, so it won't find anything new anyway

KOCUREK1970 wrote:

And the cable is intact, or it's broken somewhere.

I see no damage, the cable is quite old and long
The distance from the transmitter is about 20 km and you can see it from the window
So one antenna for two TVs will be a good solution?
I think I will move her from the balcony to the wall so that nothing is blocking her.

Try to connect, for example, a room antenna and search for a signal.
I have 60 km to the nearest transmitter and one multiplex on such an antenna receives no problem.

Konrad_M wrote:

On AC it shows 11.58V as I wrote above
Whereas DC 0.00V So ideal filtering, is it?

And you didn't mistake AC for DC?

from the above comes a whacked power supply.

Elektronik223 wrote:

And you didn't mistake AC for DC?

Oh, in fact, in a hurry, I made a mistake, the opposite is DC 11.58V
AC 0.00
I am already correcting the error in that post

now check the current consumption by the "plate"

[power supply +] -> - [+ meter -] -> - [hot wire] -> - [board]

I assume you know how to turn on the meter?

I know the intensity is measured in series (there is no problem with that ;-P).
But which hot vein is it?

There will be no high consumption, because there is no large voltage drop from the nominal 12V under load, there is a drop to 11.58V with such a low power supply (100mA), so cool

she used to be in the middle.

I'll check it tomorrow because today I don't want to wake anyone up.
But maybe it is as he wrote KOCUREK1970 this amp is too powerful.
Or maybe direct the antenna to Warsaw (Raszyn) Transmitter power 130 KW and umnie range is sufficient according to this website http://sat-charts.eu/localator.php

Hello.

Konrad_M wrote:

Measured in the antenna plug entering the decoder in the place where the power supply wires are soldered. The voltage entering the antenna is the same

After reading the entire thread, I was concerned about this statement.

I think you have some voltage separator connected.

For example like this:




Greetings.

Exactly, I have a kit like you showed. This plug has a printed circuit board, a ceramic capacitor and probably a small winding. Should I change it to something else?
I will measure the power consumption in the evening because I am at work now.

mihal2002 wrote:

throw this amplifier out of the box and replace it with a balun. You supply with a plug replace with a regular plug.

Destroy one of those antennas that looks the worst, install a signal splitter at home, connect the cables and it will work perfectly on the PASSIVE antenna.
Just try to do it all carefully, as you would for yourself .

in principle, the amplifier is unnecessary when the antennas can see each other.
unless you power more receivers ;)

then it applies
the so-called signal splitter

The power supply itself can be equipped with a regulator (for a 12V stabilizer a bipolar transistor with a potentiometer). by selecting the supply voltage in such a way as to faithfully reproduce the signal on the inputs of both receivers.

PS / change /
you can use an air balun. e.g.
http://www.dipol.com.pl/symetryzator_antenowy_sa_iv-v_C0002.htm

tv is already working, as soon as it warms up, I will do it as you write, i.e. one symmetrizator antenna and I will throw out the power supply.
I have just one more question, what is this supply voltage separator for?

Konrad_M wrote:

I have just one more question, what is this supply voltage separator for?

And what do you think, even by "peasant reason", but yeah, what comes to your mind first, well ... well? .

It causes that the voltage from the power supply does not go to the plug and the TV socket only goes to the antenna?

Konrad_M wrote:

It causes that the voltage from the power supply does not go to the plug and the TV socket only goes to the antenna?

Not for the antenna and to the antenna amplifier, but I can accept such an answer,
my friend passed to the next grade - bravo.

As for this splitter, for the sake of our memory after our death, I implore you, son, refrain from using exactly the splitter as shown in the photo ....., you must promise me that .... .
Seriously, never, ever buy ANYTHING that is called ALDA, and in a splitter in particular, buy something like this:
http://www.dipol.com.pl/rozgaleznik_tv_dwudrozny_r-2_signal_R60102.htm
or:
http://www.dipol.com.pl/rozgaleznik_indukcyjny_ri-2-1_f_E2094.htm
though I recommend the first one more !.

Thanks to everyone for your help, this and that glowed