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1  VSAT technology and installation / Hub and VSAT satellite equipment for sale and wanted / Prodelin or similar 2.4m dish required
 on: Yesterday at 6:25pm 
Started by Shahbukhari | Post by Shahbukhari  
Is there anyone who could provide me a Prodelin 240m dish or anything similar in Pakistan ? I don't know where to get it from ?

2  Anything else / General and other topics / Re: Random Interference on satellite Geostationary satellite downlink
 on: Oct 12th, 2021 at 6:46pm 
Started by Aiman | Post by Nimrod Kapon  
The spikes are across quite a wide range and there are several of them. Indeed it is very curious.

I am sorry I only have more questions, but they might lead to something:

How many will be in the air at the same time? Only one or few?

It is hard to see at this span, how narrow are they? Like a CW or they carry some modulated data?

Do you know if they can be seen over other satellites? can they been seen free in the air? For example, connecting the spectrum to an LNB and a feedhorn but without a reflector - just as you would check for terrestrial signals for example?

3  Anything else / General and other topics / Re: Random Interference on satellite Geostationary satellite downlink
 on: Oct 12th, 2021 at 3:37pm 
Started by Aiman | Post by Admin1  
...
Regarding the two different polarisation spectrum plots above, in the left plot the burst of blue spikes between the pair of wanted yellow carriers suggests testing in preparation to set up a third yellow carrier in the middle. Maybe the cross-pol spikes (right plot) are because the linear polarisation feed has not yet been adjusted in rotation.
The blue, near central, triangle marker and central spike show good polarisation alignment and may be something quite different. Is anyone testing a new antenna for sidelobe patterns?  What uplink/downlink frequencies does the NOC allocate for such testing.

...
Regarding the spectrum analyser plot above, I can see an extra spike affecting the carrier in transponder to the left of the one with 6 smaller carriers.  The display spectrum appears to be inverted.

It is possibly helpful that the interference stays for 20/30 minutes as this will allow you time to home in on it and investigate further. Pulse like displays at different frequncies may build up in max hold to reveal a wider bandwidth transmission. If the interference is CW or a slow sweep then testing is a probable source. A CW signal varying might be a sidelobe test. If you can isolate a modulated TDMA carrier slot you can use ZERO span and observe burst envelope magnitude and shape.

If you have a limited number of antennas transmitting in 6.725-7.025 it might be worth asking if any were having work done around the time of the interferences.

Do you have more than one satellite operating 6.725-7.025 uplink ?

I hope Nimrod can add more.

4  Anything else / General and other topics / Re: Random Interference on satellite Geostationary satellite downlink
 on: Oct 11th, 2021 at 9:49pm 
Started by Aiman | Post by Aiman  
Yes, I am sharing the downlink from an spectrum analyzer, you can see the normal , max hold & limit wave form. You can see some large spike at certain frequencies. To share the nature of these spikes are - a) they are short lived (duration of each spike < 500 ms) b) they  don't appear at the same frequency all the time c) when they start to occur the interference continues at same spot for 20/30 minutes. d) We received the unwanted signal on both polarization at same frequency (Horizontal & vertical) e) It is on insat C band (4.5 - 4.8 GHz) f) it is found in entire beam. Checked at several locations & found everywhere.   

5  Service Providers / Satellite Internet - Americas / Re: VSAT installers in the Americas and Caribbean ?
 on: Sep 20th, 2021 at 9:35am 
Started by Admin1 | Post by Admin1  
VSAT installers in the Caribbean

I have just updated the list of email addresses for VSAT installers worldwide and added details for Jamaica, Bahamas, Barbados, Trinidad & Tobago, Haiti, Cuba, St. Vincent and the Grenadines, St. Lucia, Martinique, Anguilla, Antigua, Montserrat, Antigua, Puerto Rico, Dominican Republic. See: https://www.satsig.net/vsat-installers/vsat-installers.htm

I have also updated specific company details on page https://www.satsig.net/ivsat/vsat-installers-caribbean-latin-america.htm

If you are a VSAT installer and would like your details added please email me. There is no charge.

6  Anything else / General and other topics / Space based power generation
 on: Sep 18th, 2021 at 2:15pm 
Started by Admin1 | Post by Admin1  
Many times in history the idea has been put about of a satellite in space receiving power from the sun and directing it downwards to create a supply of energy on earth 24/7, except for eclipse periods around the equinoxes.
The power beam might be optical, either power spot or night time illumination, or radio RF power for conversion to electricity. 

As an example, KA-SAT has a solar array power generation of around 16kW and might be able to transmit about 8kW down. Unfortunately the power down is rather dispersed over more than the whole of Europe so not usefully collectable for resale to the power grid. Maybe if all the power were directed into a spot beam 0.3 deg diameter, but such a beam would be about 190km diameter on the earth and the idea of an array of satellite TV dishes covering that area sounds incredible.

What prompted me to write this was that a report is expeced soon from a consultancy that has been paid to make a new review the possibilities, called "Space-based Solar Power as a Contributor to Net Zero".

If you have comments or ideas please add below.

7  VSAT technology and installation / Hub and VSAT satellite equipment for sale and wanted / RF over Fibre - transmitter and receiver
 on: Sep 13th, 2021 at 5:52pm 
Started by Admin1 | Post by Admin1  
RF over fibre involves laser light at the transmit end being amplitude modulated by an RF signal spectrum (maybe 10 MHz to 20 GHz) and then sent many km to a laser receiver which converts the modulater laser light back to RF signals.

In satellite communications, including the distribution of satellite TV to households, RF over fibre is now widely used to connect from the LNB at the antenna to the indoor equipment, possibly many km away.   

EMP-Centauri are a company selling such RF over fibre equipment.

For example, a satellite TV dish with a Quattro LNB outputs 4 coax cabels (each 950 - 2150 MHz).

A good example application is a Satellite TV headend serving several blocks of multiple dwelling houses.

At the Headend, each satellite TV receive dish, has a Quattro LNB with 4 coax output cables (each 950 - 2150 MHz).
With perhaps 3 satellite dishes, plus a terrestrial antenna (40 - 862 MHz), the problem is to distribute all the signals to all households over significant distances.

An optic fibre is used.

The multiple coax signals are modulated onto laser light and sent down a single monomode optic fibre. Once in the fibre the optic signal may be split and sent down single fibres physically cabled to each block of dwelling houses.

At each block of dwelling houses the optic signal connects into an RF over fibre receiver which then outputs 13 coax cables to the customers using conventional multiswitches etc.

Example equipment:

...
OT14/1FED-4 is coaxial-to-fiber converter
(optical transmitter) for 12 satellite inputs
and one terrestrial input. In addition it allows passage of gigabit GPON/EPON data.
It is powered from 12V power supply (included in package) and passes power also
to connected Quattro LNBs. For optical connection a single mode fiber is
required.

...
OR1/14FUD-4 is fiber-to-coaxial converter (optical receiver) providing 12 satellite outputs and one terrestrial output.
In addition it allows passage of gigabit GPON/EPON data.
It is powered from connected multiswitch or from external power supply.

Spec: 12 x SAT 950 -2150 MHz plus 1x TERR 40 - 862 MHz

The above pair of devices are just examples. There are many options with different nymbers of inputs/outputs.

For more info contact EMP-Centauri at Klatovy - Czech Republic.

Phone: +420 376 323 813

Email: export@emp-centauri.cz

8  VSAT technology and installation / Hub and VSAT satellite equipment for sale and wanted / Satcom equipment sale: C and Ku band BUCs etc
 on: Sep 11th, 2021 at 4:17pm 
Started by Admin1 | Post by Admin1  
Satcom equipment for sale: C and Ku band BUCs etc

2019 Comtech 250W C-Band LPOD BUC

Paradise 200W C-Band Compact Outdoor Solid State Power Amplifier (BUC)

X2 Used Wavestream Powerstream 757C 600W C-Band Indoor Compact Solid State Power Amplifier (SSPAs), 5.850-6.425 GHz

New Comtech 60W C-Band LPOD BUC

Brand New Infiniti 3100 Satellite Modem, in the original box with power adapters and power cords

New GDSatcom 2.4M C-Band Tx/Rx Antenna with FEED, KING POST and Non-Pen Mount

New Open BOX CPI TL05KO 500W Ka-Band Outdoor TWTA BUC, 27.0-31.0 GHz

Cheetah II 85cm Ka-Band 5W Flyaway VSAT Antenna

X3 New Comtech 32W EKU BUC

X6 New Comtech 20W Ku BUC

Philtech 10W EKU BUC

X14 New NJT5218NM 8W EKu BUC

1.8M Emergency Response Satellite Trailer 1.8M Auto Acquisition Antenna, Two 400 Watt KU-Band TWTAs, Generator, Dual A/C Units, HD Encoder Modulator, IRD, cables, Spec Amp

Used CPI 400 Watt Extended Ku-Band TWTA, 13.75 - 14.5 GHz

Used CPI 200W C-Band TWTA

If you want to buy any of the above please go to https://satcomresellers.com/

Best regards, Eric

9  VSAT technology and installation / Hub and VSAT satellite equipment for sale and wanted / Wanted: CPI Codan 6740 W/E-AC/EX-CE 40W C-Band AC Powered MBUC
 on: Sep 8th, 2021 at 3:23pm 
Started by Admin1 | Post by Admin1  
Wanted:  40 watt C band BUC.

If you have a CPI Codan 6740 W/E-AC/EX-CE 40W C-Band AC Powered MBUC for sale please email me reference "15:09 8 Sept 2021" and I will forward your details to the client.

Best regards, Eric

10  VSAT technology and installation / iDirect Forum: hubs and terminals / Re: X7 Load package
 on: Sep 3rd, 2021 at 5:06pm 
Started by Phill1 | Post by Osman  
I think that you have to manually install the package.
I have installed a package in a different partition on the cx700 remote.
Cx700 remote is similar to X7.
I adapted the package installations for the CX700 for the x7 remote.
Maybe you can try that.

You can connect X7 with ssh.
Then you upload the package to X7 on /common/temp/ directory.
You have to extract the package with the below command.

#package -mx -a evo_x7_rmt-x.x.x.x.pkg

After the package has been extracted, you can see install.sh script like the below command.
For example, the second command of the mmcblk0p5 part installs the package on partition 5. Also, you can install different partitions when you change the last number on mmcblk0p5.

#chmod +x package_install.sh
#./package_install.sh /dev/mmcblk0p5 "$(sha512sum /common/temp/vo_x7_rmt-x.x.x.x.pkg | awk '{print $1}')"



Then, you have to same steps to install another partition.

#package -mx -a evo_x7_rmt-x.x.x.x.pkg
#chmod +x package_install.sh
#./package_install.sh /dev/mmcblk0p6 "$(sha512sum /common/temp/vo_x7_rmt-x.x.x.x.pkg | awk '{print $1}')"

When all of the steps have been done, you have to run these commands below.

#flashdbmgr --set 5 6 0 0 main //This command is required to flash the 5. partition. If the X7 cannot flash partition 5, X7 tries flash partition 6.

#reboot