problem with system setup

[ZetaMale]

The attached file, sat0004.jpeg, is similar to Anole's FAQ for a motorized setup but I can't get anything through LNB1 of the switch. Port 1 on my switch is labeled RX (connects to the FTA receiver). If you look at my drawing labeled sat0004.jpeg, I was trying to arrange the setup where the FTA receiver connects to the SG9120 motor which in turn connects to the switch port that is labeled RX. Then the BUD C-band LNB conects to the port labeled LNB1 and the 90cm Ku band LNBF connects to LNB2. The FTA receiver is setup to select the LNB1 port for C-band LNB while the receiver selects the LNB2 port for Ku band. The SG9120 motor moves the 90cm dish while the 4DTV moves the BUD. Even though the SG9120 motor moves the 90cm dish, I assumed that the receiver could still select either LNB1 or LNB2 depending on how the ports are selected by the FTA receiver (in other words, I expect the SG9120 to pass thru the diseqc commands at all times). But, only the LNB2 port is selected while the LNB1 port never is. Does anyone know why?

I know the switch is good because the arrangement shown in drawing sat0003.jpeg works. I hope that I clearly explained the situation this time.

Another interesting thing is that Anole's FAQ indicated that my arrangement in drawing sat0003.jpeg would burn up the diseqc switch but it hasn't happened to me.

 

[Lak7]

Remove the Motor from the setup
Does the switch work now?

 

[ZetaMale]

Remove the Motor from the setup
Does the switch work now?

Yes.

 

[Phoxx]

Hook the H-H motor to your AZbox, then hook the motor to standard 2-port DiSEq switch, then hook the Ku band LNBF to port#1. For testing purposes, hook the C Band LNB directly to port #2. Does it work? If so, you may have a defective HFS-21 switch. To check, hook the DiSEqc port #2 input to the "Pass Through" side of the HFS-21 switch. Do not hook up the 4DTV receiver yet. Does this work? If so, the problem may be in the "power pass" side of the HFS-21 switch, not filtering out the power completely. try another HFS-21 switch.

Best of luck. Hope this helps. When you mix switches you have problem with transient power.

 

[ZetaMale]

Hook the H-H motor to your AZbox, then hook the motor to standard 2-port DiSEq switch, then hook the Ku band LNBF to port#1. For testing purposes, hook the C Band LNB directly to port #2. Does it work? If so, you may have a defective HFS-21 switch. To check, hook the DiSEqc port #2 input to the "Pass Through" side of the HFS-21 switch. Do not hook up the 4DTV receiver yet. Does this work? If so, the problem may be in the "power pass" side of the HFS-21 switch, not filtering out the power completely. try another HFS-21 switch.

Best of luck. Hope this helps. When you mix switches you have problem with transient power.

Well, if it is the HFS then why does it work ok in the arrangement shown in drawing sat0003.jpeg?

 

[Phoxx]

I think it is because you have the motor behind the DiSEqc switch, where as in the next schematic you have it in front.

 

[ZetaMale]

Can an HFS switch be placed between a FTA receiver and a diseqc switch?

 

[Lak7]

Can an HFS switch be placed between a FTA receiver and a diseqc switch?

What would be the purpose?

 

[ZetaMale]

What would be the purpose?

Kind of experimenting/brainstorming. I was thinking that this would be one way to hook up 2 receivers to one antenna.

 

[ZetaMale]

After looking thru Anole's FAQ, I believe I've had a gross misunderstanding of diseqc switches. I've had a 1x2 diseqc switch for several years and it was my understanding that a C band LNB can be attached to one input and a C-band LNBF can be connected to the other input. OK, let's see if I got it right - my new "understanding" is that this isn't how the switch is suppose to function. The 1x2 diseqc switch is suppose to accept inputs from a dual output LNBF and selects which section of the LNBF is used based on voltage (i.e. 12/18V - in other words, there are 2 antenna probes but they don't change their polarization). If only one output of the dual output LNBF is to be used then the diseqc switch isn't needed and the 12/18V is sent to the LNBF to switch polarity in one section (i.e the antenna is moved from vertical to horizontal polarization based on the voltage). Have I got that right?

 

[Lak7]

The 1x2 diseqc switch is suppose to accept inputs from a dual output LNBF and selects which section of the LNBF is used based on voltage

A DiSEqC Switch is not 13 / 18 voltage controlled.
A "Multiswitch" is used to connect 2 or more receivers to a Dual Output LNBF.

 

[Phoxx]

Maybe try a SW21. Its a videopath switcher used to combine two dishes to one receiver, and may provide better isolation.