| Subject | Date Asked | Expert |
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| Satellite internet in India | 11/6/2009 | Mark C J Posen |
Q: I am looking for 2 way mobile land based satellite internet service in india. do you have any info ...
A: Many thanks for this question. Regarding satellite internet in India, I don't personally get ...
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| satellite communication | 10/20/2009 | Mark C J Posen |
Q: How to calculate sun outage for a place
A: Many thanks for this question. Unfortunately it's much too complicated to describe the process ...
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| Roll Off Factor... | 10/5/2009 | Mark C J Posen |
Q: Please tell me that what would be the symbol rate which i can configure in my modulator for 6Mhz ...
A: There is not really a fixed relationship between the roll-off and the spacing factor in the way that ...
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| Roll Off Factor... | 10/1/2009 | Mark C J Posen |
Q: Please tell me that what would be the symbol rate which i can configure in my modulator for 6Mhz ...
A: Yes, what you have stated is exactly the case. BUT there is an important clarification here. It ...
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| Roll Off Factor... | 9/29/2009 | Mark C J Posen |
Q: Please tell me that what would be the symbol rate which i can configure in my modulator for 6Mhz ...
A: Really the issue depends on what ISRO mean when they allocate you 6 MHz. Do they allow a guard-band ...
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| FEC | 9/28/2009 | Mark C J Posen |
Q: In our Uplink, we are changing FEC 3/4 to 5/6,I know advantage of FEC,but can you explain me what ...
A: When you change from rate 3/4 to rate 5/6 FEC you are reducing the amount of coding (i.e. before you ...
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| Roll Off Factor... | 9/24/2009 | Mark C J Posen |
Q: during symbol rate calculation, we consider Bandwidth=1.28*Symbolrate where the roll off factor = ...
A: I am not familiar with that calculator, but I took a look at the page you indicated. For each of ...
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| Latitude & Longitude | 9/19/2009 | Mark C J Posen |
Q: I want know about Latitude and Longitude,Plz explain my question? sanat
A: You ask a very general question, so I don't know if you were really looking for something more ...
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| Roll Off Factor... | 9/17/2009 | Mark C J Posen |
Q: during symbol rate calculation, we consider Bandwidth=1.28*Symbolrate where the roll off factor = ...
A: Sorry it's taken me a while to answer but I've been very busy this week. The 3dB Satellite ...
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| Roll Off Factor... | 9/14/2009 | Mark C J Posen |
Q: during symbol rate calculation, we consider Bandwidth=1.28*Symbolrate where the roll off factor = ...
A: The roll-off factor of a digital filter defines how much more bandwidth the filter occupies than ...
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| Antenna | 9/14/2009 | Mark C J Posen |
Q: In earth station antenna, there are two categories: a) Cassegrain b) Gregorian I want to know that ...
A: Cassegrain antennas (where the subreflector is a hyperbola) are generally more popular for ...
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| FEC | 9/7/2009 | Mark C J Posen |
Q: I know why we are using FEC.Plz tell me why we are using 3/4 and 5/6 etc.what the means of 3 and 4 ...
A: Many thanks for your question and I apologise for the short delay in answering. In any digital ...
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| carrer options in satellite communications | 9/6/2009 | Mark C J Posen |
Q: good evening. i am parnita and im currently doing b.tech degree in electronics and communication,4th ...
A: Many thanks for your question. The field of satellite communications is a really interesting one ...
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| C/N | 9/2/2009 | Mark C J Posen |
Q: I was trying to calculate downlink C/N for our C band downlink freq.To find downlink C/N i used the ...
A: Many thanks for your question and I apologise for the short delay in answering. There is a small ...
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| satellite communication | 7/8/2009 | Luis Emiliani |
Q: how to calculate center frequency.How to convert RF range frequency into if range.What I know is for ...
A: well, you have you have your answer right there: in order to determine the center frequency of your ...
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| link budgeting-Sat Master | 7/7/2009 | Luis Emiliani |
Q: I'm calculating link budget using Sat Master. My satellite operator gave me the leased bandwidth and ...
A: In satmaster, depending on the version you use, you will find the bandwidth of the carrier, ...
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| satelite bandwidth | 7/3/2009 | Luis Emiliani |
Q: Cpuld you please answer me how to calculate a bandwidth for sat uplink I have tried BW=SR x roll-off ...
A: the allocated bandwidth at the 3dB point of a carrier should be matching the values in the ...
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| Purpose of Pure carrier (Transmit CW) | 7/1/2009 | Luis Emiliani |
Q: Can you tell me the purpose of this option.Many thanks.
A: the main purpose of that function is to aid in the fine pointing of the system using a spectrum ...
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| Output back off per carrier and downlink eirp | 6/30/2009 | Luis Emiliani |
Q: I am trying to do a link budget for SCPC VSAT network. In this how I can work out Output Back off ...
A: there are two elements to this. the downlink EIRP can be calculated when you know the transfer ...
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| How to calculate PEB | 6/28/2009 | Luis Emiliani |
Q: I'm interested to know how to calculate PEB. For example, imagine a 72MHz transponder with x3 ...
A: Well, if you understand that then you are halfway there. let's take a transponder of 51 dBw and 72 ...
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| Vsat link budget | 6/25/2009 | Luis Emiliani |
Q: Hope you had a nice vacation. I am trying to build a link budget for Ku Band Network of 50 ...
A: well, it all depends on the type of system you purchase. a typical vsat system has a shared outbound ...
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| like to know the application of satellite to television digital and analog transmission | 6/24/2009 | Luis Emiliani |
Q: good sir, please i will like to know as a beginner about the application and explanation of ...
A: geostationary satellites are perfectly suitable for broadcasting applications, due to the large ...
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| Vsat link budget | 6/22/2009 | Luis Emiliani |
Q: Hope you had a nice vacation. I am trying to build a link budget for Ku Band Network of 50 ...
A: in terms of capacity : if you need 256K per site, you can say that the outroute or outbound carrier ...
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| Vsat link budget | 6/20/2009 | Luis Emiliani |
Q: Hope you had a nice vacation. I am trying to build a link budget for Ku Band Network of 50 ...
A: in essence, the process does not change from 1 to 50 sites. it is still the same equation and the ...
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| Link budget | 5/13/2009 | Mark C J Posen |
Q: I doing a link budget where I have the SFD (dBW/m2) needed to saturate the satellite Transponder. As ...
A: Many thanks for your question. The formula you quote for SFD is correct; it correctly describes ...
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| antenna | 5/10/2009 | Mark C J Posen |
Q: what is the difference between than mesh and solid antenna, and we can use mesh in Ku band or solid ...
A: Many thanks for your question. Electrically there is not a great deal of difference between mesh ...
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| Sidelobe mask and off-axis EIRP | 5/7/2009 | Mark C J Posen |
Q: As a follow up to your response to above, usually the side lobe pattern is given as: 31 - 25 log10 ...
A: Many thanks for your question. Antenna sidelobe gain and off-axis EIRP masks are an attempt to ...
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| Waveguides | 4/27/2009 | Nagy George |
Q: I have a simple question regarding waveguides. Here it goes: Why would you use a circular waveguide ...
A: I did a bit of search for you www.eriinc.com/pubs/WP22026.pdf ...
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| Link budget | 4/14/2009 | Mark C J Posen |
Q: Definition & explanation required that used in link budget of Satellite communication (VSAT), i am ...
A: Many thanks for your question. There is a good introduction to Link Budgets on my "Satcom Online" ...
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| Buying and using Satellite Bandwidth. | 3/23/2009 | Mark C J Posen |
Q: I'd like to say in advance how I really appreciate you taking the time to answer my question. I am ...
A: Many thanks for your question. I'm sorry for the small delay in answering it. Your question is an ...
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| Affect of eclipse season on geostationary satellites. | 3/14/2009 | Mark C J Posen |
Q:
A: Many thanks for your question and I'm sorry for the delay in answering it. Geostationary satellites ...
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| satellite internet | 3/11/2009 | Mark C J Posen |
Q: I planning to connect to the Internet via VSAT. But I was told that it's not allowed in my ...
A: Many thanks for this question. Yes indeed, there are satellite phones which (at a price, often ...
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| Antenna | 3/11/2009 | Mark C J Posen |
Q: what is the difference between 31 - 25.log(theta) dBW and 29 - 25.log(theta)? Can you explain ...
A: Many thanks for your question and I'm sorry for the delay in answering it. The formulas that you ...
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| Choice of uplink & downlink frequency | 3/9/2009 | Mark C J Posen |
Q: Why is the uplink frequency always lesser than the downlink frequency ? although this question has ...
A: Many thanks for this question and I'm sorry for the delay in answering you. The answers which ...
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| satellite communication | 3/8/2009 | Mark C J Posen |
Q: in radio link design,I'd like to calculate the effeicency between certain satellite and associated ...
A: Many thanks for your question and I'm sorry for the small delay in answering it. In order to ...
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| Regarding sun outage | 3/8/2009 | Mark C J Posen |
Q: Sir , What do you mean by Sun Outage ? Where it affect highly either in C band or Ku band ? Do you ...
A: Many thanks for this question and I'm sorry for the delay in answering you. I've changed this to a ...
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| the disadvantages of satellites | 3/7/2009 | Mark C J Posen |
Q: what are the disadvantages of satellites?
A: Many thanks for this question and I'm sorry for the delay in answering you. Like all communications ...
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| satellite communications | 3/6/2009 | Mark C J Posen |
Q: I am a regular reader of your question and answers blog. I would like to ask you some important ...
A: Many thanks for your question and I'm sorry for the small delay in answering it. You say that you ...
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| TWTA in satellite | 3/3/2009 | Mark C J Posen |
Q: in space segment we mostly use TWTA rather than SSPA. WHY
A: Many thanks for your question and I'm sorry for the delay in answering it. Both TWTAs and SSPAs are ...
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| geostationary orbital satellites | 2/27/2009 | Mark C J Posen |
Q: what is the role of goestationary orbital satellites in international organizational communication
A: Many thanks for your question and I'm sorry for the small delay in answering it. I don't fully ...
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