[vdr] Re: What about an passive mode of VDR?

[Christian Berger <einStein@donau.de>]

Tobias Meyer-Janson schrieb:
> 
> > > Well the problem which might arrise here is temperature. If the voltage
> > > is turned on, the LNB will be heated, but if you turn of the heat it
> > > cools down and heats up a lot so the temperature isn't as stable as it
> > > is when you leave it on constantly.
> >
> > Any circuit which heats up and down often will have shorten lifetime
> > as the board and wiring have heavy mechanical movements
> > when temperature is changing.
> 
> Did I understand it right?
> If I configure my LinuxVDR-System to power up and down automatically
> before/after recordings, it would also power up and down the LNB and so
> reduce its lifetime?
> I'm wondering if this is for sure or a controverse discussion is still
> going on.

Well this depends on if another device is powering your LNB or not. In
some cases there might be another reciever powering up for you. If you
have an analog reciever you can simply find out. Disconnect the
LNB-cable at your reciever, turn on the reciever and hold the cable
close to the input of the reciever (don't touch it) If you get a (weak)
image the LNB is powered from somewhere else, if not, the LNB is not
powered.

Anyhow, the effects on the lifetime of the LNB are more or less
theoretical.

> At the moment I plan to configure my system for energy-saving reasons to
> power off if it is going not to be used for some hours. So I expect it
> to power up and down once or twice daily. If I had a normal digital
> receiver, I think I would power it up and down much more often this,
> wouldn't that affect the LNB (adversely)?

Like I said, the effect on the LNB is theoretically, I've never heared
of any studies beeing done on this. Maybe you should ask at your local
TV station.
However powering on and off a computer reduces the lifetime of the
harddisks (theoretically)
 
> Does it make any difference if one has a LNB including the multiswitch
> or 2 separated units? In my case it's the latter and the multiswitch has
> its one power supply.

Well then it may, or may not power the LNB if the reciever is turned
off. However you can simply pull the plug since that power supply
usually isn't needed.
 
> TMJ

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