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Asoftware product developed by Microsoft. Its purpose is to bring programming down to a drag-and-drop level to speed up development cycles. In many ways that goal has been achieved. VB's main competitor at one time was Borland's Delphi. Both programs offer similar functionality, with VB based on the BASIC programming language and Delphi based on Pascal. The actual code generated by VB is BASIC, and you can go in and ed
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Visual Basic - amr wrote in messagenews:telecom22.545.9@telecom-digest.org: I'm negotiating with my customer the fesibility and benifits of the 30 GHz spectrum analyzer to his microwave links. My customer has many problems, especially interference problems on his microwave links. They have some questions which needs someone in the field: The microwave tower is very high (50m) , so how they get the RF signal seen by the antenna which is located at the top of the tower?If, the antenna at the top is indeed an antenna, and not some sort ofoutdoor unit, you should be able to connect your spectrum analyzer to thetransmission line at the bottom.(make sure you have some pads on the inputat first to ensure you do not smoke the front end of the spec a) How to get it to the spectrum analyzer?See above. How do people solve this problems?If you see interference from the antenna, see if you can see theinterference on the bottom of the tower using a yagi connected to thespec a, and try to identify where the interference is coming from. Is there any cable supports such long distance carrying RF signal at 30 GHz?At 30GHZ that may be a bit tough to find a cable that will not causeexcessive loss of the signal. Is it possible that the 30GHZ is only onthe outdoor unit, and some kind of IF is between the indoor unit andthe outdoor unit. Harris has a 38ghz radio, and here is the spec pagefor it. Notice it does have an indoor and outdoor unit, and the twohave amax separation of 300m.http://www.microwave.harris.com/products/legacy/pdf/192f.pdf For you to know the situation: The RF is converted to the IF also at the top of the tower by means of their receivers?So you are saying the bottome unit transmits and recieves the IF, andthe top unit just transmits and receives the 30ghz??? That is howHarris does it. So there is another question how would they connect between the antenna and the receiver?Usually a cable Belden 9292, or Belden 9248 depending on the freq ofthe IF. Or they have to use another antenna with the spectrum analyzer? Do we have any application notes about testing and troubleshooting Microwave links?http://site-mag.com/ar/telecom_basic_microwave_linkcommissioning/http://www.softwright.com/faq/support/microwave_link_budget.htmlhttp://www.atdi.com/microwave_planning.htm Thank you very much.
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