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DISH SETUP: Single sat, Multi-Sat & Motorised
KA Band section
Dishes for Ka-band: what works - what doesn't?
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<blockquote data-quote="John" data-source="post: 1003668" data-attributes="member: 175005"><p>Need to remind y'all, I'm no RF engineer or electonics guru, nothing i say should be taken as gospel as we say. Study the pic's and make your own judgements.</p><p></p><p>My good friend scopus Chris mentioned the other day about angling the RF source in a downward angle to the dish face to replicate the incoming signal from the satellite as it hits the dish inner mesh.</p><p>Good point i thought , but got same results as before.</p><p></p><p>Knowing what signal levels should read like from looking at satellites in the normal way on the Promax , i set the distances between the the RF source at the front of the dish and the receiving lnb/Promax on the back side of the dish.</p><p>To try to ensure that the pickup lnb was not being influenced by any stray radiated RF i extended the waveguide on the SSA RF device and also fitted an extension to the pickup waveguide lnb to hopefully try to ensure the applied RF was concentrated as best i could to a 50mm circle on the dish mesh.</p><p></p><p>The Ka results were the same as the other day, ie: appears to show leakage through the mesh at 21GHz which is not a total surprise.</p><p>However, on Ku, where you might have expected a lot less leak-through, was a different story. Again-adjusting the devices separation so as not to over saturate the lnb/Promax pickup and to replicate the same sort of received signal level from a normal sat transmission, the leakage seemed to be fairly evident.</p><p>The head scratching then started, it was cold and wet, decided i'd had enough, so i packed up and went back inside.</p><p>Any Pro RF engineers thoughts / suggestions most welcome.</p><p></p><p>Ps: Don't ask me why the forum software keeps flipping certain images ??, i don't know.</p></blockquote><p></p>
[QUOTE="John, post: 1003668, member: 175005"] Need to remind y'all, I'm no RF engineer or electonics guru, nothing i say should be taken as gospel as we say. Study the pic's and make your own judgements. My good friend scopus Chris mentioned the other day about angling the RF source in a downward angle to the dish face to replicate the incoming signal from the satellite as it hits the dish inner mesh. Good point i thought , but got same results as before. Knowing what signal levels should read like from looking at satellites in the normal way on the Promax , i set the distances between the the RF source at the front of the dish and the receiving lnb/Promax on the back side of the dish. To try to ensure that the pickup lnb was not being influenced by any stray radiated RF i extended the waveguide on the SSA RF device and also fitted an extension to the pickup waveguide lnb to hopefully try to ensure the applied RF was concentrated as best i could to a 50mm circle on the dish mesh. The Ka results were the same as the other day, ie: appears to show leakage through the mesh at 21GHz which is not a total surprise. However, on Ku, where you might have expected a lot less leak-through, was a different story. Again-adjusting the devices separation so as not to over saturate the lnb/Promax pickup and to replicate the same sort of received signal level from a normal sat transmission, the leakage seemed to be fairly evident. The head scratching then started, it was cold and wet, decided i'd had enough, so i packed up and went back inside. Any Pro RF engineers thoughts / suggestions most welcome. Ps: Don't ask me why the forum software keeps flipping certain images ??, i don't know. [/QUOTE]
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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
KA Band section
Dishes for Ka-band: what works - what doesn't?
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