Re: mnet problems

At 12:10 20.10.1997 +0000, you wrote:
>Dear Dr Dish,
>We are a satellite company based in Cyprus, Paphos and have installed
>numerous systems around the area approx 1500 2.4m plus hundreds of 90 cm
>dishes.  I would say our experience in the field is very good, however,
>I have encountered a problem which I just can not fathom out I am sure
>you can help me.
>About a year ago I installed a number of MNET systems,- PAS 4, C Band,
>without any problems. 2.4m dish, 17k Cal amp LNB, receivers PACE (irdeto
>conditional access card).  Over the summer I started to get calls from
>these customers about loss of sound and picture every 2 to 3 minutes. On
>one specific customers I did the following.  Changed the LNB twice, 
>Changed the coaxial cable and connectors, re located the dish and
>finally changed thje receiver.  The problem still exists.  On studying
>the sittuation further the customers only lose the pictures and sound on
>clear days and nights, if the weather is cloudy picture and sound are
>stable without any interuptions.  The dishes are also facing a hill
>where there are terrestrial antanaes for the local channels and maybe
>mobile telephone repeaters. 
>If I am getting TI problems do I need some sort of band pass filters. 
>The systems as mentioned is C band package mnet
>Kind regards
>Andreas Paschali.
I am afraid it could TI from the mobile telephone repeaters. First try band
pass filters. JOHANSSON and GLOBAL Communications offer this filters for a
low price. This filters are cutting down all signals below 900 MHz.
From the same companies you can get the "satslopes", which "equalize" the
IF-band. We got the same day/night experience here and this little device
cured the problem, because the agc of our tuner could not cope with strong
signals in the lower band.

Christian Mass (Dr.Dish)
Editor of TELE-satellite International (http://www.TELE-satellite.com)
Producer of drdish@tv, Europe´s first satellite info-channel

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