meter readings translation

iwol

Specialist Contributor
Messages
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My Satellite Setup
channel master 1.2m dish
technomate 6900,,and invacom 0.3 quad lnb
satlook micro
My Location
yorkshire
#1
hi to all just got a meter(satlook micro) and decided to take some readings on 19e,at the lnb, before my v box and after the vbox,not quite sure which are the important readings,ie the signal strength,the ber readings or the snr readings ive listed the readings below for anyone to explain or tell me what the readings mean thanks guys
AT LNB................SIGNAL 97 BER 1.54E04 SNR 9DB
BEFORE VBOX.......SIGNAL 65.3 BER 2.87E04 SNR 9DB
AFTER VBOX.........SIGNAL 57.4 BER 3.17E04 SNR 9DB

:-doh2:-doh2:-doh2:-doh2
 

Snuffer

Regular Member
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My Satellite Setup
Skystarcard,Fortec's life time ultra's, MaxPlus 2100's,Dreambox and a Tandberg
My Location
Amsterdam
#2
This meens that the coax from LNB to VBOX loss 30% of signal. )(-red
How long are you cable? what Quality are you use??????

And insert loss of VBOX are 12% of signal. to reduce that make a tuner insite coil and Capicitor proberly SWR are bad.

So you see to have it optimal its more than simple.
 

iwol

Specialist Contributor
Messages
692
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16
My Satellite Setup
channel master 1.2m dish
technomate 6900,,and invacom 0.3 quad lnb
satlook micro
My Location
yorkshire
#3
hi thanks for rply the cable run is about 18-20m and i was led to believe it was ct100 or equivalent which are the main figures someone told me it was the snr but thats 9db anywhere cheers
 

rolfw

Believe it when I see it Admin.
Staff member
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My Satellite Setup
Technomate 5402 HD M2 Ci, DM7000s, Transparent 80cm Dish, Moteck SG2100 DiseqC motor, lots of legacy gear. Meters: Satlook Digital NIT, Promax HD Ranger+ spectrum analyser.
My Location
Berkshire
#4
That does sound like a huge loss, what frequency were you testing?
 

iwol

Specialist Contributor
Messages
692
Likes
16
My Satellite Setup
channel master 1.2m dish
technomate 6900,,and invacom 0.3 quad lnb
satlook micro
My Location
yorkshire
#5
cheers rolf about 12263 i think
 

iwol

Specialist Contributor
Messages
692
Likes
16
My Satellite Setup
channel master 1.2m dish
technomate 6900,,and invacom 0.3 quad lnb
satlook micro
My Location
yorkshire
#6
can anyone explain what the main readings were and what loss you would expect plz
 

rolfw

Believe it when I see it Admin.
Staff member
Messages
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My Satellite Setup
Technomate 5402 HD M2 Ci, DM7000s, Transparent 80cm Dish, Moteck SG2100 DiseqC motor, lots of legacy gear. Meters: Satlook Digital NIT, Promax HD Ranger+ spectrum analyser.
My Location
Berkshire
#7
Well the loss at 1.663 Ghz the If frequency for 12,263 Ghz should be around 25db over 100 metres, so 20 metres should only see a loss of around 5db, are you sure that the first reading is correct?

As long as you maintain a good SNR (signal to noise ratio) and stay above the signal strength threshold of the receiver, you should be fine.
 

iwol

Specialist Contributor
Messages
692
Likes
16
My Satellite Setup
channel master 1.2m dish
technomate 6900,,and invacom 0.3 quad lnb
satlook micro
My Location
yorkshire
#8
cheers rolfw will double check, i tried it in the spare output on the lnb as its a quad invacom but this output should have less output than the one my receiver is plugged into anyway,is it worth getting some more cable and trying it, if so what would you recommend,also what does the 9db mean thanks,
ps im not having trouble receiving much its just that i bought a meter and decided to check the levels .last question what about the drop through the vbox,is this normal cheers
 

iwol

Specialist Contributor
Messages
692
Likes
16
My Satellite Setup
channel master 1.2m dish
technomate 6900,,and invacom 0.3 quad lnb
satlook micro
My Location
yorkshire
#9
anyone help plz thanks
 

rolfw

Believe it when I see it Admin.
Staff member
Messages
37,713
Likes
1,288
My Satellite Setup
Technomate 5402 HD M2 Ci, DM7000s, Transparent 80cm Dish, Moteck SG2100 DiseqC motor, lots of legacy gear. Meters: Satlook Digital NIT, Promax HD Ranger+ spectrum analyser.
My Location
Berkshire
#10
Yes, you will lose some signal through the V-Box, there is a thread somewhere of a mod you can make to reduce this. Th 9db is the amount of signal above the ambient noise, 9db should be more than adequate.

Try the measurement again before changing the cable.
 
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