Tv Broadcast signal`s

[rabbit73]

first want to see if I can pick up / receive a radio signal.

Here is a chart of our US VHF-Low Channels:

This scan, using an RTL-SDR V3 dongle and GitHub RTLSDR Scanner software, shows the channel 3 Pilot Carrier:

 

[rabbit73]

As N5XZS mentioned in post #24, the rabbitears.info site can be very helpful in finding US VHF-Low channels. Start with this page first:

Allocation Map for Channel​

https://www.rabbitears.info/allocationmap.php

For all channel 2 allocations, fill it out like this, and click on Go:

The result should look like this:

If you click on WLBZ and then Technical Data, you should see this:

 

[rabbit73]

The RTL-SDR V3 dongle SDR is available here (the V4 doesn't work with the Scanner):
Buy RTL-SDR Dongles (RTL2832U)

The RTLSDR Scanner software is available here:
Releases · EarToEarOak/RTLSDR-Scanner

I use version 1.3.0

There is a short tutorial by Pete Higgins:
OTA Signal Analyzers, Meters, Aimers, Bench Gear...

It took me 3 training sessions to learn how to use the Scanner software. If you also find it difficult to learn the Scanner software, you can use SDR# (SDRSharp) software instead with the V3 SDR. It will only show a little more than 2 MHz of the 6 MHz TV channel, but that is enough to show the low end of the channel to see the Pilot Carrier and estimate the SNR.

 

[John2021]

There is one slight possibility is by E-skip or F2 Ionosphere skips conditions instead of troposphere ducting conditions.

We use VHF-low for various Full power and low power stations using ATSC 1.0 "8VSB modulation" and 3.0 "COFDM or OFDM modulation"

Via, E-skip and F2 skip over Atlantic Ocean to Europe is possible but not tropo ducting.

You may have to use VHF-low band TV antenna " 54 to 88 MHz range "

It will take time and patience to TV DXing but reward will be great.

Be aware we use 60 Hz with higher video framerates in 30i, 30p, 60p, and future 120p for ATSC 3.0.

Video resolution are, 480i, 480p, 720p, 1080i, for ATSC 1.0 and 480p, 730p 1080p and 2160p for ATSC 3.0.

Note: 2160p and 120 FPs are not quite put to use yet but will come soon in the future for our new ATSC 3.0 system.

I hope I don't get too technical for you, but we do have rich video flavors.

I hope they don't charge for ota 3.0

 

[johan]

Top information members . I found someone here in the Netherlands who specializes in building Yagi antennas. Suppose he has questions, I ask them here. Mvg

 

[johan]

A question; you use channels 2 to 6 on 1 and the same antennne. ?! or do you have an antenna for ( 2 and 3) and (5 and 6) , and then in yagi form ?!

 

[navychop]

Usually, upper and lower VHF are on the same antenna. Many antennas are available to cover both VHF and UHF.

 

[johan]

This is the answer given by the designer/builder; Hello Harry,

If I only look at the lower VHF part, I see frequencies from 55 to 88Mhz.
This is about 30MHZ.
For a peaked antenna you are actually stuck with a bandwidth of 2..Mhz.. 3 maybe 4 Mhz.

It is possible to design a normal yagi with a bandwidth of about 8mhz...
But of course this is already at the expense of the gain... and gain was just what you wanted I understand.

So.... it is possible.... but 'only' for a few channels.
So for example channels 2 and 3 or channels 5 and 6.

How do you see that?!

Mvg

 

[Jim5506]

For optimum results in a difficult situation you use an antenna tuned to the ONE channel you want to observe, anything else is a compromise.
A wide band antenna, of course does work but not in extreme circumstances.

 

[Foxbat]

Well it's depends on your location, assuming you are in Europe and aim for USA is point your direct focus antenna towards west to southwest from Europe.

Like airline traffic, I believe the transmission from the United States will be coming into Europe over the Arctic region (shortest distance and all). Get a globe, a push-pin, and some string to measure the direction to the larger cities like Boston, New York, or Philadelphia (where the AntennaMan is located, I believe.) This will not be west-southwest, but more west-northwest.

 

[navychop]

And PRAY!

 

[johan]

And PRAY!

Yep , and go fore itt

Mvg

 

[telstar_1]

Like airline traffic, I believe the transmission from the United States will be coming into Europe over the Arctic region (shortest distance and all). Get a globe, a push-pin, and some string to measure the direction to the larger cities like Boston, New York, or Philadelphia (where the AntennaMan is located, I believe.) This will not be west-southwest, but more west-northwest.

View attachment 178153​

Well, wait- the shortest course being a straight line, why any heading adjustment en route? The shortest actual distance is only represented by an arc on a flat map.

 

[Foxbat]

Well, you could translate the whole map grid to polar coordinates and arbitrarily put the North Pole on top of your location. Then, all direct routes to you are straight lines…

 

[telstar_1]

Well, you could translate the whole map grid to polar coordinates and arbitrarily put the North Pole on top of your location. Then, all direct routes to you are straight lines…

right, on flat map as well as globe

 

[Foxbat]

right, on flat map as well as globe

As long as your flat map's projection is adjusted for your location. But the Earth's not flat, you know? Which is why I suggested a globe as the easiest way to visualize the antenna's bearing to attempt to DX USA ATSC broadcasts.