BSC621C-2

[tonydix]

I bought one of these LNB's. I find it is different from the ones described in some posts since the Ku and C Band cannot be connected together with a jumper. There is only one connector on the C band LNB
So presumably there is no internal disq switch. And I shall therfore have to run two signal cables from each of the LNB's back to the receiver in order to receive both C and Ku signals.
As always thanks for any advice.
Tony

 

[Lak7]

Sounds like the "BSC621-2D"
You are correct, no internal switch
You can put an External Switch at the Dish, so there is only 1 cable running to the receiver.

 

[truckracer]

Mine sucked on ku. I put my corotor back on and ku went to the moon!

 

[justmyluck]

trouble

i'm having problems with the bsa621-2 also, have been at it for two weeks now and still the same, had to use a switch with four ports to run to the rec. and still have got a signal of 80 but no quality at all.... i'm using a 90cm dish, same with the ku band have signal of 78 and no quality have been moving the thing up and back with cone in different pos. and still no good..... there may be something wrong with this 621-2....

 

[Lak7]

i'm using a 90cm dish

A 90cm Dish for a Mini Bud project is probably a little small, most use a 120cm.
Another thing, the Ku part of a BSC621 is designed for a BUD, not a "Ku Offset" Dish. Usually for a Mini Bud project, you use a C Band only LNBF, the Combo LNBFs do not work that well for that.

 

[tonydix]

How does the BSC621 cope with horizontal and vertical polarisation. There is no little motor on it to drive for skew ?

 

[Lak7]

How does the BSC621 cope with horizontal and vertical polarisation. There is no little motor on it to drive for skew ?

It uses Voltage from the Receiver.
13volts for Vertical
18volts for Horizontal
It is not adjustable like a servo motor feedhorn.

 

[i4tas]

I tried the "BSC621-2D". Ku does indeed suck. C-band is okay.

 

[tonydix]

Thanks Lak7 for your excellent advice. Can someone explain precisely where to measure to in order to set the correct focal distance. Is it to one of the 2 wires in the throat of this LNB. I will be measuring from the centre of the dish.
How will I acheive the correct orientation ? Is this by trial and error ?
Thanks
Tony

 

[Mr Tony]

I've always done trial and error and for me that seemed to work the best. Of course, I make sure I'm working with a 6 footer so most of the time pushing the LNB in closer to the dish works the best

 

[Lak7]

Can someone explain precisely where to measure to in order to set the correct focal distance.

Rule of Thumb: Focal Distance is measured to 1/4" inside the Feedhorn Mouth.
Are you replacing an existing CoRotor Feed?

How will I acheive the correct orientation ?

Park the Dish at your True South Sat, pop the Feedhorn Cap off, look from behind the Dish - up into the Feedhorn, you should see a 1/4" metal Rod (not the "wires") that Rod should be perfectly Horizontal.

 

[truckracer]

Those dual band lnbf's suck on ku, even on a large bud. Corotor works so much better

 

[tonydix]

Yes I am replacing a chaparell corotror lnb . Inside the throat of the Chaparell LNB you can see a piec of wire bent into a U shape which moves with the skew function on the stb. Inside the the throat are stamped the letters
No 5
6-91

Tony