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  Satellite Internet forum › iDirect Forum: hubs and terminals › About option file value of MODEM_PARAMETERS
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Question: Someone how to view parameters!!

Idirec 3000    
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OPTIONS_PARAMETERS    
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Total votes: 1
« Created by: Robert on: Jul 7th, 2014 at 4:19pm »

Pages: 1

About option file value of MODEM_PARAMETERS

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Ex Member
Ex Member
Jul 7th, 2014 at 4:19pm  
Good Morning to all.
Refer to value MODEM_PARAMETER of Modem 3000 Series.
I would like to know how I have to do to check the values ​​that correspond to each type of modulation? For example rx_modtype 1 = QPSK, 8PSK etc. rx_modtype 2 =.
What would be the command or arguments to see that each value has meaning?
From already thank you very much
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« Last Edit: Jul 22nd, 2014 at 10:41am by Admin1 »  
 
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fluffymassive
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Posts: 67
SA. Australia
Reply #1 - Jul 17th, 2014 at 5:59am  
0      QPSK Rate 1/4
1      QPSK Rate 1/3
2      QPSK Rate 2/5
3      QPSK Rate 1/2
4      QPSK Rate 3/5
5      QPSK Rate 2/3
6      QPSK Rate 3/4
7      QPSK Rate 4/5
8      QPSK Rate 5/6
9      QPSK Rate 8/9
10      QPSK Rate 9/10
11      8PSK Rate 3/5
12      8PSK Rate 2/3
13      8PSK Rate 3/4
14      8PSK Rate 5/6
15      8PSK Rate 8/9
16      8PSK Rate 9/10
17      16APSK Rate 2/3
18      16APSK Rate 3/4
19      16APSK Rate 4/5
20      16APSK Rate 5/6
21      16APSK Rate 8/9
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Eric Johnston
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Reply #2 - Jul 21st, 2014 at 9:43am  
I am trying to help someone.
I have similar questions for new iSCPC system:

1.
Extract from options file:
tx_mode = 2
tx_modtype = 1
tx_clksource = 0
tx_fecrate = 15
tx_scram = 1
tx_diff = 0
tx_specinv = 0
tx_power_in_dbm = -35.000000
tx_spreading_factor = 1
tx_spread_enable = 0

What is the above modulation type and FEC ratio ?


============
2   Another question
Extract from options file:
tx_mode = 2
tx_modtype = 0
tx_clksource = 0
tx_fecrate = 18
tx_scram = 1
tx_diff = 0
tx_specinv = 0
tx_power_in_dbm = -2.000000
tx_spreading_factor = 4
tx_spread_enable = 1

What is the above modulation type and FEC ratio ?



=================
Best regards, Eric
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Eric Johnston
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Posts: 2109
Reply #3 - Jul 21st, 2014 at 11:19am  
I think I have solved it. I got them to look at the iSite screen.

tx_modtype = 0    BPSK
tx_modtype = 1    QPSK

tx_fecrate = 15    FEC=0.793
tx_fecrate = 18    FEC=0.495

Is that right ?
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fluffymassive
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Posts: 67
SA. Australia
Reply #4 - Jul 22nd, 2014 at 5:30am  
Hi Eric,

Looking at iSite like you have I presume when you select the drop down box for the MODCOD it will be either 0,1,2 and then the FEC drop down is then dependant on the MODCOD selected. if you used a process of elimination by selecting each type you could create a MODCOD/FEC grid

I.e.
MODCOD    0      1      2
FEC            12    17    22
                  13    18   23
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Email me: eric@satsig.net

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