2.5 dual tuner problem

I've heard of this problem occurring occasionally when using
non-powered multiswitches. These multiswitches draw their operating
power (for the switch itself, and for all of the LNBs) from one or
more of the receivers. In some cases, the receiver or receivers
providing the power can't provide enough, either due to receiver
limitations or to excessive voltage drop in the coaxial able. In
these cases, when the primary receiver changes its LNB drive voltage
(to switch to a different polarization sense) the multiswitch and/or
other LNBs lose power for a moment, and suffer a glitch.

The surest way to eliminate this problem is to use a multiswitch with
its own (wall-wart) power supply.

For non-powered multiswitches, it can help to try switching the
receivers to different ports. I believe that some multiswitches draw
most of their operating power from the receiver on jack #1, and it can
help to make sure that the receiver on this jack is a newer model (the
multi-satellite-capable models tend to have more robust LNB power
supplies).

--
Dave Platt
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I am having a similar problem with my D6520. In my case, it appears that
the switching relays are contaminated or going bad. Sometimes when I change
channels that cause the multiswitch to change LNB ports, the (non-TiVo)
receiver will show "Searching for satellite signal". If I jump to the
previous channel then back to the new channel, the signal comes in. It's
like the relay needs to be exercised.

If I plug directly into the LNB, I never see this problem.

-Joe

...

Check your cables. I had a cat bite into one of mine, and that caused
enough damage to get me that message.

Is your multi-switch powered? If not, how long is your cable run? Generally
the multi-switch should be powered if you have more than 100 feet of
cabling.

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