LNB question

[gremlin411]

I have question about the BSC621 / BSC621-2 LNB. I what to add a 6' offset dish to my current setup. I was going to use a ecoda 22khz switch for the switching. My cs5k will do diseqc or 22khz tone and it does handle universal lnb's I think. so I was thinking that the BSC621-2 would be the lnb that I needed to use to change from the C/band to the KU-band side of this lnb.
I would run the six footer to the 0/22khz side of the switch and other dish to the on side of the switch that way I turn the diseqc on or off depending on which band C/KU I would like to watch. Does this sound right to you guys.
Thanks for the help.

[wejones]

Originally Posted by gremlin411

I have question about the BSC621 / BSC621-2 LNB. I what to add a 6' offset dish to my current setup. I was going to use a ecoda 22khz switch for the switching. My cs5k will do diseqc or 22khz tone and it does handle universal lnb's I think. so I was thinking that the BSC621-2 would be the lnb that I needed to use to change from the C/band to the KU-band side of this lnb.
I would run the six footer to the 0/22khz side of the switch and other dish to the on side of the switch that way I turn the diseqc on or off depending on which band C/KU I would like to watch. Does this sound right to you guys.
Thanks for the help.

Well, I may have this backward again, but I think the BSC621-2 has a universal lnb on Ku, which uses 22khz, and it has an internal diseqC switch that switches between the 2 bands, while the BSC621 has a standard ku lnb, and a 22khz internal switch.
Therefore, I see no problem with using a diseqC switch with the BSC621, however I think there would be a potential problem with using an external switch with the 621-2, because the 621-2 has both 22khz and diseqC switches internal already. You can isolate the Ku portion of the 621-2 from the internal switch, but I don't think you can isolate the C-band side. You might be able to get it to work, but I think there are potential problems.

[pmb1010]

I ran a BSC-621-2 on an offset 4 foot dish, along with 30" ku dish and Universal LNBF, and an old dish network dish for music.
There was HH120 motor on the 4 foot dish.

It all ran to 4 port Diseqc switch.

Port 1 = C band 4 foot
Port 2 = Ku band 4 foot
Port 3 = Ku band 30" dish fixed at G10R
Port 4 = Ku band 18" dish fixed at Echo8

I had to turn 22khz on for the Universal LNBF's.
It worked just fine. No need for 0/22khz switch.

[gremlin411]

Hey guys thanks I have a diseqc with my poorman's dish now I did not even think about that ( had a brain fart ). LOL!!!!!!! I was just so focus on the loop for the lnb from c/ku band could not see the forest for the trees.
Thanks I think that will work fine
The BSC621-2 it is..

[wejones]

Originally Posted by pmb1010

I ran a BSC-621-2 on an offset 4 foot dish, along with 30" ku dish and Universal LNBF, and an old dish network dish for music.
There was HH120 motor on the 4 foot dish.

It all ran to 4 port Diseqc switch.

Port 1 = C band 4 foot
......

I think this is the key to get it to work. Ie The 621-2 has an internal diseqC switch, that you can't isolate from C-band, so to get it to work you have to have the C-band on port 1 since any other port will probably turn it off via the internal switch. That's why I said that it "could" work, and I'm glad to see that it can, but I think there are still some "possible" timing issues. Ie say that you're on the C-band port, and you switch to port 2. The diseqC switch in the 621-2 will switch to port 2, basically turning off the C-band. If then later, you switch back to C-band, the receiver sends a diseqC port 1 command, which the external switch receives, but the internal switch will not... at least until the external switch actually switches, which will not be instantaneous. So I think how well it works may depend upon just how long the receiver continues to send out the diseqC commands, which seems to be a second or two from what I've seen, and also depends on how fast the diseqC switch reads the command and switches. Otherwise you might have to send the command twice.
Apparently though the timing must not be an issue... ie the switches must switch fast enough so that the receiver will still be sending when the switch has flipped. BTW, I realize these are electronic switches, not mechanical, but there are still latency issues, not the least of which is getting the internal switch's processor powered up.
Anyway, this is interesting. Out of curiosity, I'd really like to put together a diseqC decoder, and figure out how many times these receivers send out those commands, and when. Ie I've seen at least one of my receivers tends to send out diseqC commands again, if no signal is found, but it can't do that indefinately, because sending out diseqC too long might interfere with 22khz switch operation in the off state.
Interesting topic.