Possible bad legacy LNB?

[THEGAME15]

I didn't want to open a new thread for a possible similar issue, I'm not sure if I have a faulty LNB or Diseqc switch. Here's the situation: It's a Dish 500 setup with I'm sure 1 Legacy LNB and one DP LNB (took me a while to figure that out) I had the exact setup months ago with a Nfusion hooked up, I would get a lot of channels after scanning once configured correctly in settings. Since I bought a new Nanosat Premium (Factory 9.14/Sky 1.07) using the same settings from the Nfusion, I haven't been able to get all my channels scanned in, I have swapped the LNB's back and forth and the issue follows the particular faulty LNB. I get a good signal from most transponders 75 - 90% besides the spotbeam ones which I get about in the 50% range as i'm central Canada, but when I scan on the supposed faulty LNB I am missing channels from specific transponders, it has a good signal (80%), just wont get the channels from it. I have yet to try swapping the cable on the Diseqc port, but will try when I get home and see if that fixes the issue. Could this a sign that I should replace the particular LNB?

[Terryl]

It's always a bad idea to mix the LNB technology on the D500 setups, try to use 2 of the same type LNB's (all legacy, all DP, all DP+ or two of the same type from the same manufacture) or get a DP twin LNB it will save a big troubleshooting headache.

Some of the old LNB's don't play nice with the new ones.

And if you have more questions I will move this to your own thread, it will be easier on all that respond.

[THEGAME15]

The LNB's look exactly the same but when one was on satellite 110 (nfusion days), it would only scan half the channels until I changed the settings to DP then it would scan over 300 but before that setting was somewhere way lower, after work I will try swapping cable from the port of the LNB and also trying changing Diseqc port, see if the problem changes, if not i'll just pickup a new LNB. Thanks for the information. :)

[Terryl]

I moved this to a new one as it may get longer, this way we can work on your problem.


And be sure to power the receiver down with the switch in back before messing with the coax connections to any switch.

[Terryl]

The difference between legacy and the DP LNB's is that the legacy LNB's need ether +13 volts or +18 volts to switch between the transponders, with one receiver it switches +13 volts for the Vertical transponders and +18 volts to switch to the Horizontal transponders, if you need more then one receiver then you have to use a legacy switch, this type of switch takes 2 connections from all LNB's and it does the switching for the receivers as needed.

The DP LNB's use what is called Band Stacking, this puts all one polarity on a lower band and the other polarity on a higher band, this is why it's not a good idea to use the two different technology's together.

So take a good look at the LNB's make sure they are of the same type.

[fn59]

As described in the post above DP lnb's use only vertical tp's, the horizontal tp's are converted to a higher freq. and become vertical tp's. I don't know about the nanosat receivers, but if there is something like a blind scan or smart scan, then you can try scanning vertical tp's only on the DP lnb.

[THEGAME15]

As a follow up to the issue, it turns out both LNB's were Legacy LNBF's, I told the dealer who I usually buy my equipment from and he thought it was strange when i described what was going on, so I got a new Legacy LNBF and all is well with over 700 Channels scanning in both Video and Audio Channels, so the issue was the LNB. Thanks you guys for your assistance. :P