Intelsat 901 18W (Can Not find)

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ramzety

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Posts: 3

Jan 25^th, 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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Posts: 2109

Reply #1 - Jan 26^th, 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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ramzety Member ★★ Offline Posts: 3	Reply #2 - Jan 28^th, 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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