On Mon, 22 Sep 2008 06:59:28 -0700 (PDT), wrote:

I now want to use a quatro LNB.

If a true quad-LNB,

A quattro LNB is not the same as quad LNB. The former just outputs the
four "bands" (hi-band vert/horiz, lo-band vert/horiz) the latter offers
four independant outputs with the relevant band/polarisation selected by
the receiver as normal.

I'd just pick one of the quattro outputs and see if the meter worked. If
it did I'd then check the alignment with the opposite band and
polaristation.

--
Cheers
Dave.

Dave Liquorice wrote:
On Mon, 22 Sep 2008 06:59:28 -0700 (PDT), wrote:

I now want to use a quatro LNB.

If a true quad-LNB,

A quattro LNB is not the same as quad LNB. The former just outputs the
four "bands" (hi-band vert/horiz, lo-band vert/horiz) the latter offers
four independant outputs with the relevant band/polarisation selected by
the receiver as normal.

I'd just pick one of the quattro outputs and see if the meter worked. If
it did I'd then check the alignment with the opposite band and
polaristation.


Yes, thanks. I intend to feed the trunk cables into a multiswitch. I
wasn't sure if I was likely to harm the LNB by powering the wrong
socket. I thought the multiswitch maker would be able to tell me which
input powered the LNB, but no luck. I guess it doesn't matter so I'll do
as suggested and see what happens.

Thanks

Peter Scott

Peter Scott wrote:

Yes, thanks. I intend to feed the trunk cables into a multiswitch. I
wasn't sure if I was likely to harm the LNB by powering the wrong
socket. I thought the multiswitch maker would be able to tell me which
input powered the LNB, but no luck. I guess it doesn't matter so I'll do
as suggested and see what happens.

With most, if not all, quattros you can power any output (at 12 to 18 V,
typically) and all four outputs will be active.

Most, if not all, multiswitches power all four LNB inputs (necessary if
in-line IF amplifiers are to be used) at ~18 V. Some switches provide
13 V on the vertical inputs; this is a historical hang-over from
single-band dual switched LNBs in the early analogue satellite days.

There's at least one make of switch which can provide 13 V on the
vertical inputs and 22 kHz on the high-band inputs, enabling a standard
quad LNB to be used. This is useful if you want to use a $ky minidish
on a small domestic IRS.

--
Andy

Andy Wade wrote:
Peter Scott wrote:

Yes, thanks. I intend to feed the trunk cables into a multiswitch. I
wasn't sure if I was likely to harm the LNB by powering the wrong
socket. I thought the multiswitch maker would be able to tell me which
input powered the LNB, but no luck. I guess it doesn't matter so I'll
do as suggested and see what happens.

With most, if not all, quattros you can power any output (at 12 to 18 V,
typically) and all four outputs will be active.

Most, if not all, multiswitches power all four LNB inputs (necessary if
in-line IF amplifiers are to be used) at ~18 V. Some switches provide
13 V on the vertical inputs; this is a historical hang-over from
single-band dual switched LNBs in the early analogue satellite days.

There's at least one make of switch which can provide 13 V on the
vertical inputs and 22 kHz on the high-band inputs, enabling a standard
quad LNB to be used. This is useful if you want to use a $ky minidish
on a small domestic IRS.


Thanks very much. That reassures me that I won't blow up my LNB. I
thought that there would probably be protection in the LNB against
unwanted voltages and control signals but it's good to have it
confirmed. I was teaching at an HE college when it started to run
satellite courses way back when. Am I right that the early LNBs made a
buzzing noise when they changed polarity due to it being done by
stepper? I wondered if my memory was faulty.

Best wishes

Peter Scott

On 23/09/2008 16:20 Andy Wade wrote:

There's at least one make of switch which can provide 13 V on the
vertical inputs and 22 kHz on the high-band inputs, enabling a standard
quad LNB to be used.

That would be a Vision multiswitch. I've got a V75 508A in the loft
connected to a quad LNB.

--
F