Forum TV-SAT

It`s been 2 years when my friend Peon tried reception in the extended C band 4.5-4.8 GHz. Unfortunately he wasn`t lucky that time. After so many months he decided to give it a try today again and here come the results:

Arabsat 5A @ 30.5°E (locked on the following frequencies):
4556 RHCP, SR 1000,FEC 1/4, QPSK
4672 RHCP, SR 12000, FEC 3/4, 8PSK
4714 RHCP, SR 4860, FEC 5/6, QPSK
4720 RHCP, SR 4860, FEC 5/6, QPSK

There is data transmission on all transponders.

Insat 3C @ 74.0°E
4743 H - 1-2 dB is needed to get lock

Unfortunately, Peon's 2.5m PF dish doesn't seem to be big enough at the moment to get Insat beam, as ca. a 2.7m dish is needed to get at least 1 transponder locked. The good news is that there is a 3.7m dish ready to be installed later this year in Peon's garden, so hopefully this will help to get more transponders from Insat 3C.

Czy jest jakiś LNB który "obskoczy" obie części pasma C?
Nie za bardzo bym chciał w przyszłości żonglować dwoma konwerterami w jednym paśmie.

SES 6 @ 40.5W

4553 RHCP Blomberg Latin America, SR 6667, FEC 3/4,DVB-S, QPSK, MPEG-2, V 1260, A 1120 en/1121 AC3 eng, clear

4641 LHCP - ca. 2dB under the lock threshold (possible reception with 3m+ dish)

Peon used his Norsat 8115IF LNB to get the results above even his 2.5m dish is not big enough for the second frequency. Well, the time to set up his 3.7m PF dish is coming...

Anyway, the Norsat 8115 IF is not the only one lnb that we currently have for this band. There are also 3 pieces of RSC 2245-IND lnbs that will be later use for some tests.

What`s more, I`d like to point out to one very interesting lnb. Superior Satellite from Montana, USA sells their 8000RI DRO LNB that covers 3.625-4.8 GHz band. LO stability at 5.75 Ghz is ±500 kHz and noise temperature 20K (identical to Norsat 8520). The price is unknown to me yet as Peon has his 8115 IF lnb that is probably the best lnb on the market for a reasonable price. Of course, there would be some interest, but even if the LNB is very impressive, it can not receive full C band. It would be impossible to get frequencies as low as 3.4 GHz because every receiver has tuner that works to 2150 MHz only.

5750-3400=2350 MHz

http://www.superiorsatelliteusa.com/pdf/8000RI-LNB.pdf

At this stage it could be worthy to try to re-tune the LO frequency on an ordinary C band LNB. Maybe it would be possible to get current LO at 5.15 GHz to ca 5.503 GHz (5.503-4.553=950 Mhz). Well, here is the point where a real DXing starts. This is the challenge some DXers may take and hopefully succeed!

Artur pisze:Czy jest jakiś LNB który "obskoczy" obie części pasma C?

Częściowo... 3,600-4,800 SMW coś takiego wypuściło
http://www.smw.se/c-band-pll-high-stab. ... hz-ref.-13