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Satellite Launches and Retirements
Es’hail 2 25.5e
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<blockquote data-quote="Llew" data-source="post: 1065635" data-attributes="member: 175007"><p>Mine doesn't reach below 10545 MHz, so unlikely to be much good for receiving the AMSAT transmissions.</p><p></p><p>BTW, a converter such as the Zinwell SUP-2400, which I have used with a US DirecTV Ka LNB for shifting its low IF output to the 950-2150 range, is ideal for use here. No need to open up your LNB to change its local oscillator.</p><p> A small modification is required to the unit, a wire or two to solder in. Widely available for a few quid from the States, an online search will bring up loads of sellers.</p><p> </p><p>My Promax analyser has the usual 950-2150 IF range which cannot be extended, so I used this with the SUP-2400 for seeing if I can go down to, for instance 10000 MHz. An Octagon Optima OTLSO PLL LNBF was used for reception of signals generated by a VMA Spectrum Analyser.</p><p></p><p>Works fine. Obviously, without a relevant transmission yet from ES'Hail 2, I have to use the Promax to show the results with just the signal from the VMA source, rather than any STB etc. The SUP-2400 spectrum output is reversed, so it has to be taken account of when we convert the frequencies to a LOF figure in whichever receiver we use. </p><p></p><p>To find the LO frequency to set in a receiver for a specific received transmission, here's an example for 10000 MHz :-</p><p></p><p>10000 MHz minus 9750 MHz (LNB's LO) = 250 MHz.</p><p></p><p>Reversed spectrum of the SUP's 2400 MHz minus 250 MHz = 2150 MHZ. That's on the edge of your receiver;'s IF range!</p><p></p><p>For the LO figure to put in your receiver, 10000-2150 = 7850 MHz.</p></blockquote><p></p>
[QUOTE="Llew, post: 1065635, member: 175007"] Mine doesn't reach below 10545 MHz, so unlikely to be much good for receiving the AMSAT transmissions. BTW, a converter such as the Zinwell SUP-2400, which I have used with a US DirecTV Ka LNB for shifting its low IF output to the 950-2150 range, is ideal for use here. No need to open up your LNB to change its local oscillator. A small modification is required to the unit, a wire or two to solder in. Widely available for a few quid from the States, an online search will bring up loads of sellers. My Promax analyser has the usual 950-2150 IF range which cannot be extended, so I used this with the SUP-2400 for seeing if I can go down to, for instance 10000 MHz. An Octagon Optima OTLSO PLL LNBF was used for reception of signals generated by a VMA Spectrum Analyser. Works fine. Obviously, without a relevant transmission yet from ES'Hail 2, I have to use the Promax to show the results with just the signal from the VMA source, rather than any STB etc. The SUP-2400 spectrum output is reversed, so it has to be taken account of when we convert the frequencies to a LOF figure in whichever receiver we use. To find the LO frequency to set in a receiver for a specific received transmission, here's an example for 10000 MHz :- 10000 MHz minus 9750 MHz (LNB's LO) = 250 MHz. Reversed spectrum of the SUP's 2400 MHz minus 250 MHz = 2150 MHZ. That's on the edge of your receiver;'s IF range! For the LO figure to put in your receiver, 10000-2150 = 7850 MHz. [/QUOTE]
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Satellite Launches and Retirements
Es’hail 2 25.5e
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