A joke puzzle for connoisseurs :-)

Today is a holiday in Ukraine, and to cheer up, I offer a joke question to connoisseurs of satellite reception:

For which transponder is it easiest for me to get the transport stream?

This is the C-band spectrum, which was received on a small antenna with an aperture of 85cm:

Table of the strongest transponders:

And a hint for the sake of the holiday - the spectra of average (black curve) and maximum (gray line) noise against the background of the RF spectrum, received by the IQmonitor Pro program in the RF spectrum mode of maximum graphic resolution:

Write your answers with the rationale for the choice and do not forget that the task for specialists is a joke

I wish you all success and health!

Zitat von hvdh

The answer (that is probably wrong) is 3747,96 MHz that has the highest Link Margin of 17,9 dB.

But why is it only shown in the table but not in the spectrum, bandwidth too small to fit?

The 3748 MHz transponder with the highest Link Margin of 17.9 dB is on both spectra with a level of 78 and 77%

The bandwidth is drawn correctly on the spectra, but in different BlindScan modules the transponders are different: in the first case, we see only the bottom of the transponder legs, and in the second (HR mode), the transponder legs are tied to the Noise Level and the transponder outline is drawn.

The answer is attractive, "obvious", but, alas, incorrect

This transponder did not cause the green Lock indicator to "light up", and no traffic stream was received...

Danke für deine Variante.

Auch dieser Transponder gefällt mir. Aufgrund des Fehlens einer grünen Sperranzeige war es jedoch nicht möglich, einen Stream davon zu erhalten

Thanks for your version.

I also like this transponder. But it was not possible to get a stream from it due to the lock of a green lock indicator

femi

The answer to your question about polarization:

The webcam was installed on the top of the parabolic antenna and simultaneously recorded the dynamic spectrum of both polarizations.

The depolarizer was removed, rotated 90° relative to the receiving pins, and inserted into the waveguide.

As you can see, the R and L circular polarizations are reversed on the V and H receiving probes. C/No are about the same and, it would seem, are sufficient for a transponder lock...

Die Antwort auf Ihre Frage zur Polarisierung:

Die Webcam wurde auf der Oberseite der Parabolantenne installiert und zeichnete gleichzeitig das dynamische Spektrum beider Polarisationen auf.

Der Depolarisator wurde entfernt, um 90° relativ zu den Aufnahmestiften gedreht und in den Wellenleiter eingesetzt.

Wie Sie sehen können, sind die R- und L-Zirkularpolarisationen an den V- und H-Empfangssonden umgekehrt. C/No sind ungefähr gleich und reichen anscheinend für ein Transponderschloss aus ...

A comic task aroused serious interest ...

Apparently, you need to give a second hint.

I will tell you an old parable about the Teacher and the Student:

"One day the Teacher asked the Student:

- What is the brightest star in the sky?

The Student was embarrassed and replied:

- Teacher, but now it's daytime and you can't see the stars in the sky...

- Did I tell you that the stars cannot be seen during the day?

- No, but how to see the stars during the day?

- Look into the deep well...

The Student ran away, but soon returned and joyfully announced:

- Teacher, I saw the reflections of the stars in the water at the bottom of the well! But why can't I see them when I look straight into the sky?!

- Think, it will be the Knowledge that you obtained yourself, and therefore the most valuable...”

PS Have you seen RF peaks with an amplitude of ~40dBm on your spectra ?