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1  Service Providers / Satellite Internet - India, Asia and Australia / Re: Antenna Manufacturer in China
 on: Apr 21st, 2018 at 2:04pm 
Started by Alignsat antenna - Ex Member | Post by Emma  
Hello!

Do you also have Mesh antennas C band 3.1m?

Thanks,

Emma

2  VSAT technology and installation / Hub and VSAT satellite equipment for sale and wanted / For sale: Hughes HX-200 Ku Band outdoor hardware with heated dish
 on: Apr 17th, 2018 at 10:07am 
Started by Admin1 | Post by Admin1  
Dish: Telesat # 180502.
Transmit module: Hughes CE 0682
LNB: No identifiers
P/N 1500192-0221 2W=2M
S/N 10078907534

As illustrated below.

There is a control box, for the dish heater, but this  hidden in the photos. There is an on-off switch, power goes into this and out to the dish.

None of this system has been tested, only known to work before it was removed from a hotel. To be sold as seen.

...

...

Contact:  mnyanke@shaw.ca

Dish: Telesat # 180502 with heater.
Transmit module: Hughes CE 0682
LNB: No identifiers
P/N 1500192-0221 2W=2M
S/N 10078907534

The information above has been put here by forum admin, at email request from the seller.

3  Service Providers / Satellite Internet - Europe / Using Viasat modem and Tria for Astra2Connect
 on: Apr 13th, 2018 at 1:05pm 
Started by Topm | Post by Topm  
Is it possible to use a Viasat modem and the Tria for receiving the Astra2connect beam?
Dish is now pointing to KA-sat Eutel 9e . For Astra2connect is has to point to 23.5E.

4  VSAT technology and installation / iDirect Forum: hubs and terminals / I-Direct X5 CRC Errors
 on: Mar 30th, 2018 at 11:59pm 
Started by Globaloscillator | Post by Globaloscillator  
Gentlemen hello,

Is it possible to tell from the rmtstat of the modem as below if the CRC errors are on the receive or transmit side?

"
Remote Status: t:000180811666 SNR=14.30 TxPower=-16.50 dBm RxSignalPower=-35.53 dBm Temp=36.25 COF= 16739 TDM(NCR)_Lost=589 PL_Lost=1433 LocalFOCorrection = 6473 FastFadeCorrection = 10614 FllDac=33095
CRC8Errors = 14 CRC32Errors = 3 Digital AGC Gain=503
Clock Delta Count=78
Network ID =1
"

Thanks,

Globaloscillator


5  VSAT technology and installation / iDirect Forum: hubs and terminals / Re: Paired carrier multiple acess (VPCMA -L)
 on: Mar 8th, 2018 at 5:39pm 
Started by gabriel | Post by Admin1  
I suggest you contact iDirect and ask if they can introduce you to someone who has PCMA working with iDirect. Someone else may answer you here but it is worth checking with iDirect in case someone can be helpful.

Also, ask iDirect to help you with your proposed system design. Talk to your satellite owner also, as you will need to reduce your lease bandwidth and arrange overlap.  What cost savings will apply ?

Regarding network. The idea will not work if your hub beam and remote beam are cross-strapped, for example your hub is in a North America beam and your remotes are in South Africa spot beam.  So the starting point needs to be that you can see all your own signals.

I don't understand why you should have to buy new RF equipment. Surely all you need do is move the return link frequencies into the same range as your hub outlink.

Regarding a possible problem...  The idea is that once the outlink carrier canceller is turned ON, your hub analyser screen will see your own outlink carrier disappear (down by 25 dB or more) and allow the return links from your remotes to be visible and received at the hub. That sounds good.  I am not too sure what happens at the remotes. They will see the big outlink carrier from the hub unchanged but superimposed they will see a load of small bursts from the remotes themselves.  Hopefully the interference from the composite addition of all the return link bursts will be at least 10 dB below the outlink carrier level so that the outlink transmission to the remotes will still work.  Check that your burst spectral density is well down.  If you are using a smallish dish as the hub and largish VSAT remotes then the difference may be less... The uplink G/T and gain setting of the satellite transponder are also factors.

This explanation document:  http://www.idirect.net/~/media/Files/Tech%20Briefs/iDirect_PCMA_Hub_Canceller_Ho... from  iDirect shows a remote site receive spectrum like so:
...

Note how important it is that the total interfering power of all the return link transmissions do not interfere unacceptably with the remotes reception of the outlink. 




6  VSAT technology and installation / iDirect Forum: hubs and terminals / Paired carrier multiple acess (VPCMA -L)
 on: Mar 8th, 2018 at 12:40pm 
Started by gabriel | Post by gabriel  
Hello,
Is enyone using a PCMA solution in an iDirect HUB? What are the disadvantages of this kind of equipment installed at the HUB side?
To use PCMA, I need to change my existing RF equipment: BUC + LNB for every terminal and for the HUB side so that they will be able to work on the same frequency range? (TX and RX will overlap)

Thank you

7  Anything else / General and other topics / How do I to measure noise with spectrum analyser
 on: Feb 28th, 2018 at 10:19am 
Started by Admin1 | Post by Admin1  
Q: How do I to measure noise with spectrum analyser ?

My answer was:

On the spectrum analyser select MARKER NOISE FUNCTION ON. Move the marker to somewhere on the noise floor and read off the noise power spectral density in dBW/Hz.

This is very important as spectrum analysers are calibrated to give measurements assuming an unmodulated CW input signal only, not noise !.

The  MARKER NOISE FUNCTION ON automatically adjusts for the bandwidth and shape of the resolution bandwidth filter and the characteristics of the internal voltmeter and the way noise does not look like a sine wave.

Approx adjustments are x1.2 for bandwidth, x1.05 for detector and 2.5dB for log. Much better to let the MARKER NOISE FUNCTION do if for you !!

Read more: http://uspas.fnal.gov/materials/11ODU/AN150-4.pdf

Read more: http://www.ab4oj.com/test/docs/5966-4008E.pdf

if you are measuring low level signals pull out the input cable and observe that the 'noise floor' drops at least 20 dB.  If not, you are measuring the noise of the analyser itself and you need an external pre-amplifier.  The input attenuation will normally need to be set to zero but be careful - don't burn out the analyser with high level input or DC

8  Anything else / General and other topics / Re: created new member
 on: Feb 12th, 2018 at 5:13pm 
Started by erictestdisplay | Post by Eric Johnston  
Just modified the code in Display.template and now the row of links, including
Reply
now shows top and bottom of the postings. Area called "Threads Button Bar". Trouble is the links make a wide  line and it does not work well on tiny mobile phones....

9  Anything else / General and other topics / Re: created new member
 on: Feb 12th, 2018 at 4:08pm 
Started by erictestdisplay | Post by Admin1  
The Reply link seems to have disappeared.

Using the quote button works.

Does anyone, who is logged in as a member, see the Reply button?.

The underline text formatting seems to have stopped. Bold is ok.


10  VSAT technology and installation / iDirect Forum: hubs and terminals / How to test iDirect universal LNB ?
 on: Feb 8th, 2018 at 1:58pm 
Started by erictestdisplay | Post by erictestdisplay  
Does anyone have any suggestions on how to measure the DC current taken or detect if it outputs thermal noise when pointed at the ground, wet rag etc:

The specification is here: http://www.idirect.net/~/media/Files/Spec%20Sheets/SPEC-SHEET-Uni-Ku-PLL-LNB-011...

If your LNB has an external manual switch you need to make sure it is set to the correct band (high or low).

If you have renewed the cables, then the centre pin should stick out about 1.5mm above the rim of the F connector. The outer braid must make good contact with the outer of the plug and no small braid fragments nuts short circuit the inner to the outer.  The DC power from the indoor unit must get to the outdoor unit. The current should be 145 to 170 mA.  I don't know if this figure is displayed on the modem screen.

There are some more ideas here: https://www.linksystems-uk.com/connection-troubleshooting/

best regards, Eric