[linux-dvb] Tuning Issue - Southern UK

Andrew Cowper lin-dvb at bloat.plus.com
Tue Jan 24 13:05:21 CET 2006

Jon Burgess <jburgess at uklinux.net> writes:

> Andrew Cowper wrote:
>> Hi -
>> Can anyone explain why I can tune my Freecom DVB USB stick using the
>> Crystal Palace settings, which is about 25 miles from my house, but
>> not the Hemel Hempstead settings, which is about 5 miles?
>> I wouldn't mind but the reception is terrible. My Freeview box from
>> Tesco has great reception, so I'm not sure what the problem is...
>> Crystal Palace:
>> T 505833333 8MHz 3/4 NONE QAM16 2k 1/32 NONE
>> Hemel Hempstead:
>> T 816000000 8MHz 3/4 NONE QAM16 2K 1/32 NONE
>> Any hints on diagnosis would be great...
> I live in Hemel as well and can only pick up the Crystal Palace
> transmitter. The Hemel transmitter is much lower power than the one at
> Crystal Palace and I believe is only intended for people which live in
> a low lying area which can not get a decent signal from Crystal Palace
> transmitter.

I looked on the roof and the aerial points towards Crystal Palace
rather than Hemel, and all the houses down the street are the same, so
I guess there must be a hill in the way or something...

<snip helpful frequency formulas>
> Have you checked to see which mux channels your freeview box is using?

It doesnt have the UI for that - unless I can tell from a UHF channel

> Are you using the same aerial for the freeview and Freecom?

I think the aerial is the problem. I split the aerial where it comes
through the wall and when send one lead to the freeview box and one to
the computer I get bad reception on the computer. But when I just have
one wire from the wall to the computer, or even if I just unplug the
aerial from the freeview box I get good reception. Is it possible that
the freeview box is corrupting the signal somehow?

Anyway for now the solution is to unplug the old freeview box and
train the wife to use MythTV.

Thanks for your help

Andrew Cowper

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