Problem catching AMC6 @72w (1 Viewer)

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jogon64

Thread Starter
SatelliteGuys Pro
Sep 18, 2009
199
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Northern Mexico
Hi. I´m having a pretty tough time trying to catch amc6 @72. I have already been able to aim at aproxm 20 sat slots so I think I can pretty much catch any ku sat (or at least I thought so).

I started analyzing what could be wrong (weird skew, weak signal, etc) I´m using a 30" offset which Lyngsat says is enough for my location.

What I hadn´t realized is that up til now I have been using strong TPs with a high SR to aim. My pansat 2700 which I use for aiming has quite a bit of a delay scanning low SRs.

Since amc6 has no high SRs according to The List and Lyngsat I´m suspecting this could be the reason I can´t get any signal. I just can´t find this sat.

Is there anything else I might be doing wrong? Are there any pointers for catching this bird?

I´ve kinda taken it as a challenge to catch this sat before the year ends, but I´m running out of time. Help!

Thanks and Happy New Year to all!
 

AcWxRadar

SatelliteGuys Pro
Apr 26, 2006
4,575
4
40 miles NW of Omaha. Omaha?
Jogon64,

72W shouldn't be too hard of a sat to pull in. Even in your location. Most of Northern Mexico would do well if you have a 80cm dish. You should be guaranteed a signal then.

What TP are you trying to dial in with? Try 12053 Vertical, SR 6890. This is the NBC MUX TP and you should be able to locate this. It shows it as feeds on Lyngsat, but it is always active. Go for this one TP first.

RADAR
 

Mr Tony

SatelliteGuys Pro
Supporting Founder
Nov 17, 2003
288
35
Mankato, MN
There are a couple lower symbol rate transponders but the one that radar posted should work just fine
 

TRG

SatelliteGuys Pro
Pub Member / Supporter
Jul 19, 2007
2,568
1,275
Albuquerque, NM
I'm in New Mexico and 72W is usually weak for me. 74W right next door comes in strong. It wasn't always like this. And before someone asks, yes my dish is peaked.
 

Jim S.

When someone asks you if you're a god, you say yes
Lifetime Supporter
Jan 2, 2006
5,277
716
FN11od
72W has been varying in strength lately. The one time I tried to find 74W though, it was a lot weaker, although there was only one channel active on it at the time.
 

Tron

SatelliteGuys Master
May 6, 2005
6,599
33
Metro New Orleans, LA
Wasn't NASA moving from AMC-6 due to solar panel issues with the bird? Perhaps that's the reason for the weak signals in some locations. On the C-Band side, NASA was steadily over 82 percent quality on the Visionsat IV-200 using PortaBUD (Sadoun SD180G 6-footer)...
 

B.J.

SatelliteGuys Pro
Oct 15, 2008
2,029
1
Western Maine
.....

What I hadn´t realized is that up til now I have been using strong TPs with a high SR to aim. My pansat 2700 which I use for aiming has quite a bit of a delay scanning low SRs.

......

If you see delays locking low SR signals, it could be due to poor signal level, but it could also suggest that the LO freq in your LNBF is off. This will make the frequencies that the receiver sees off a bit, and the receiver will have to search around a bit to find the signals. I've seen one lnbf that would drift to about 5 MHz off freq when the temperature got cold, and when that happened, I would then have problems locking transponders that had SRs lower than around 4000. With some receivers I couldn't lock them at all, with other receivers I could lock them but there would be a delay. Some receivers would take as long as several minutes to find the transponders.
Most lnbfs however shouldn't be off by that much. Most should be within 2 MHz, and you really shouldn't have problems or lengthy delays on the NBC mux unless your LNBF is way off.
You might just experiment on a low SR transponder on another sat that you CAN pick up, and try varying the transponder or LO freq by a couple units and see if it will lock quicker. With some PC card receivers, you can get an accurate reading of how far off freq your lnbf actually is, but with an STB, you may just have to experiment a bit to figure out what offset works best. Once you find out how far off your lnbf is, you can change the transponder freq that you're using to search for the sat by that amount, and it should lock quicker making it easier to locate the sat. If the lnbf is always off by that amount, you can change the LO freq to compensate, but if it's a temperature related drift, then you're better off just living with the delays once you locate the sat.

Higher quality LNBs won't drift much at all, like a few tenths of a MHz, but the cheap consumer lnbfs will typically drift over 1 MHz even at normal temperatures, and will drift a bit over 2 MHz during very cold or very hot weather. Since the NBC mux is approximately 7 MHz wide, there really shouldn't be an issue with this mux with most receivers, unless you have a defective lnbf. I had an lnb once that suddenly became off freq by 20 MHz. I had a receiver that allowed me to adjust the LO freq by this amount, and I lived with it for quite a while before finally replacing it.

Different receivers seem greatly different with respect to how they are affected by being off frequency. I have a few receivers, like the TT3200 PCI receiver, and my Fortec Ultra and Fortec Mercury, that can be off by 20 MHz, and will often search around and eventually find a transponder, provided that I have the proper SR keyed in, and provided that there isn't another similar SR signal nearby that it finds first. For example, I could tune in a 4080 H transponder, switch the polarity to V, and after a short delay, a 4060V transponder would pop in, while still tuned to 4080. However other receivers, like my Fortec Lifetime, Coolsat 8100, Diamond 9000, Genpix, and Azbox need to be much closer in freq, or they won't find the transponders. Like within a few MHz. My Twinhan 1020a, however, needs to be right on. Usually within 1 MHz, maybe 2 at the most, or it will not lock. With some receivers, like my my Broadlogic 1030, or with my 4200 DCII receiver, I can go to a diagnostic screen which shows the freq offset it's using. On the 4200, you can watch it search for low SR transponders by moving the LO offset around. The 4200 takes a LONG time, on the order of several minutes, to establish the proper offset, but the Broadlogic generally establishes the offset rather quickly, on the order of 10s of seconds, depending upon how far off the frequency drift is.
 
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