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Pages: 1

Intelsat 901 18W (Can Not find)

(Read 3308 times)
Ex Member
Ex Member


Jan 25th, 2009 at 4:20pm  
Pleas help!

I have a channel master 1.8M dish, Idirect 7000 with opt file below.

I have swept from -15 elv to +5 elv and can not seem to find the downlink anywhere.

I am located in the IZ shooting 254 az with -7.64 elv to Intelsat 901.

I have checked voltage on both the TX 24v and RX 19v cables.

I have also been able to see carriers with a spec. I have not been able to get more than 3v on a muliti meter.

[MODEM_PARAMETERS]
     data_port = 0
     loopback = 0
     interface_type = 0
     rx_freq = 1021215000
     rx_acqrange = 3000000
     rx_bitrate = 2048000
     rx_mode = 2
     rx_modtype = 1
     rx_fecrate = 15
     rx_scram = 1
     rx_diff = 0
     rx_specinv = 0
     tx_freq = 1000000000
     tx_bitrate = 2048000
     tx_mode = 0
     tx_modtype = 1
     tx_clksource = 0
     tx_fecrate = 15
     tx_scram = 1
     tx_diff = 0
     tx_specinv = 0
     tx_power_in_dbm = -25.000000
     rx_fsd = 13596
     is_demod2_active = 0

[ACQUISITION_PARAMETERS]
     fsd = 121311

[UCP]
     power_uplink_control_processing = 1
     max_power_level_in_db = 0.000000

[ODU]
     music_present = 0
     odu_rx_dc_power = 1
     odu_rx_10_MHz = 0
     odu_tx_dc_power = 1
     odu_tx_10_MHz = 1
     odu_disable_tx_pwm = 0

[TDMA]
     tx_watchdog_timeout_in_frames = 2

[TIMEPLAN]
     fec_blocks_per_outroute_frame = 78
     symbols_per_inroute_frame = 159775
     outroute_fec_block_len = 512
     outroute_fec_type = 793
     inroute_fec_block_len = 512
     inroute_fec_type = 793
     unique_word_len = 32
     symbols_per_outroute_frame = 159775
     num_acq_slots = 1
     aperture_traffic = 8
     aperture_acq = 2214
     num_traffic_slots = 74
     payload = 2048
     skip_slots = 2

[LL]
     ll_open_active = 1
     ll_tx_window = 1841
     ll_rx_window_backoff = 184
     ll_rx_window = 1024
     ll_t1_timeout = 4000
     ll_t2_timeout = 1000
     ll_t3_timeout = 5000
     ll_t4_timeout = 1500
     ll_t1_retry_limit = 5

[SPOOF]
     spoof_debug_level = 0
     spoof_passthru = 0
     spoof_timeout = 100
     spoof_oos_buffer_size = 64240
     spoof_keepalive_timeout_ms = 6000
     spoof_fwd_ack_ms_timeout = 200
     spoof_fade_timeout = 120000
     spoof_reap_timeout = 480000
     spoof_syn_timeout = 120000
     spoof_max_sessions = -1
     spoof_accel_connect = 1
     spoof_accel_port = 80
     spoof_retx_buffer_size = 211010
     spoof_peer_retx_buffer_size = 193189
     spoof_merge_on = 0
     spoof_compression_on = 0

[MODEM_INSTALLATION]
     hub_lat = 39.599000
     hub_long = 282.245000
     

[FREQ_TRANS]
     down_translation = 10000.000000
     up_translation = 13050.000000
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Eric Johnston
Senior Member
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Personal text from Profile,
Options, Top line

Posts: 2108
Reply #1 - Jan 26th, 2009 at 12:35pm  
Use this page dish pointing Iraq to find your correct azimuth, elevation and polarisation angles.

I think your elevation should be something like 12.2 deg and polarisation +57.1 deg.

Elevation: Set the elevation angle either by using the scale on the bracket behind the dish or as follows:
Read the manual to find the elevation offset angle of the dish (say X deg).
Set the front face of the dish vertical. The beam elevation is now X deg.
The wanted beam elevation is lower, so tip the top of the dish forwards by (X - 12.2) deg.  Use an inclinometer placed upright against the front side edge of the dish or dangle a weight on a string down in front and measure the gap distance at the bottom. gap=sin(X-12.2) x vertical diameter of dish.

Polarisation: Find out from the hub what your downlink polarisation is called.  If vertical, first set your polarisation to true vertical by putting the LNB side arm so it sticks out sideways.  The broad faces of the LNB rectangular waveguide will be on top and underneath.  This is true vertical polarisation. Second: Now apply the polarisation adjustment +57 deg.  Put an inclinometer sideways across the LNB or BUC body.  While facing towards the satellite turn the feed/BUC/LNB assembly 57 deg clockwise.

Options file: Check with your hub that you have the correct file.  Ask about what your receive frequency and bit rate should be (plus ask what name is your downlink polarisation).

For information, here is a view of your Hagerstown teleport hub dish and its pointing azimuth direction:
...

Best regards, Eric.


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Ex Member
Ex Member


Reply #2 - Jan 28th, 2009 at 1:19pm  
Eric thanks for the input but it seem that the focal piont of the Feed Horn was on the wrong notch.

Took a bit of brain storming but it is up and running.

Thanks again...
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