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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
KA Band section
Ka-sat sarosat general dynamics prodelin / global skyware ka 1.2
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<blockquote data-quote="Channel Hopper" data-source="post: 1088802" data-attributes="member: 175144"><p>There is a minimum surface accuracy that should not be exceeded with Ka band material, I think this is in the region of 0.14mm at the upper frequency to be used. If the perforations within the reflector are no larger then I cannot see how it should not be used in a composite design such as a fibreglass/smc reflector. The advantage would be the bonding of the material during construction, which would 'lock ' the active material into an inert structure.</p><p></p><p>There are two disadvantages of using solid metal on larger dish designs, weight being the first ( the thicker the metal the less signal passes directly through ( foil type thickness is not good at Ka frequencies) , the second is thermal distortion , or 'creep" which on a composite antenna will eventually break the bond between metal and plastic.</p><p></p><p>You might have to write a letter to one of the other manufacturers - such as Raven/Global Skyware - ask if their Ka dish designs above 90 cm are solid metal inside, or buy one and take it apart for a difinitive answer.</p></blockquote><p></p>
[QUOTE="Channel Hopper, post: 1088802, member: 175144"] There is a minimum surface accuracy that should not be exceeded with Ka band material, I think this is in the region of 0.14mm at the upper frequency to be used. If the perforations within the reflector are no larger then I cannot see how it should not be used in a composite design such as a fibreglass/smc reflector. The advantage would be the bonding of the material during construction, which would 'lock ' the active material into an inert structure. There are two disadvantages of using solid metal on larger dish designs, weight being the first ( the thicker the metal the less signal passes directly through ( foil type thickness is not good at Ka frequencies) , the second is thermal distortion , or 'creep" which on a composite antenna will eventually break the bond between metal and plastic. You might have to write a letter to one of the other manufacturers - such as Raven/Global Skyware - ask if their Ka dish designs above 90 cm are solid metal inside, or buy one and take it apart for a difinitive answer. [/QUOTE]
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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
KA Band section
Ka-sat sarosat general dynamics prodelin / global skyware ka 1.2
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