Tv Broadcast signal`s

[rabbit73]

Via my mobiel i can acces this Site , if i want to do this with my pc i get the massage; forbidden !?

mvg

I had a similar problem. There were so many ads my Norton security software wouldn't even let me logon. Using a Private Window helped, but the best solution was to join as a Pub Member / Supporter.

 

[primestar31]

The site is having issues right now, and Scott hasn't yet been able to nail down exactly what's causing them.

 

[rabbit73]

The SDRPlay series of SDRs has a unique feature not usually found in other SDRs. In addition to the usual relative dBm scale, it also has a calibrated dBm scale that can be used for absolute signal measurement when properly setup.

View: https://www.youtube.com/watch?v=MRR-x_TjOp4


johan:
Closed captions can be auto-translated to Dutch as shown in previous posts.

Here are some measurements of a Channel 2 ATSC 1.0 signal from a Thor modulator. They display as 31 dB SNR on the SONY TV, 89% Signal Quality on the Mediasonic HW250STB, and 4.4 dBmV on my Sadelco DisplayMax 800 Signal Level Meter.

2025-2-6 RSP1B SNR 31dB Measurements:

This was a closed system; no antenna
RSP1B center channel calibrated measurement: -60.1 dBm
Modulator > Variable attenuator > amp 17 dB > 4-way splitter for:
1. RSP1B
2. SONY TV: 31 dB SNR
3. Mediasonic 250STB: 89 percent Signal Quality
4. Signal Level Meter: 4.4 dBmV

For comparison:
Using the RSP1B calibrated measurement:
-60.1 dBm + 15dB BWCF = -45.1 dBm
-45.1 dBm + 49 = 3.9 dBmV; very close!

BWCF is Bandwidth Correction Factor

Next will be CH2 signals with local EMI noise added.

 

[rabbit73]

SETUP TO CREATE CH2 ATSC 1.0 SIGNAL
UHF/VHF Antenna
              \
          Combiner> Amp 17dB> 4way split
              /
ThorMod> VariableAttenuator
   /
HW150 to add UHF sig to Thor HDMI input
Splitter feeds:
1. RSP1B
2. HW250STB
3. SONY TV for SNR
4. HW150 to later add UHF sig to Thor
Attenuator was adjusted to produce 15 dB signal.

The above setup was created to add local EMI noise to the simulated CH2 signal from the Thor Modulator. The noise was from a VHF-High folded dipole. If I had used a CH2 folded dipole, the noise level would have been higher.

 

[johan]

Rabbit73

Do you have a photo or drawing of what is between your antennas and the receiver, in terms of splitter or amplifier. because I am overwhelmed with information. Everything well intentioned.

Mvg