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DISH SETUP: Single sat, Multi-Sat & Motorised
X band Milsat and Deep Space Set-up
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<blockquote data-quote="Channel Hopper" data-source="post: 1061553" data-attributes="member: 175144"><p>Since I am a bit stuck awaiting components to arrive (I have already dismantled everything I might need, in readiness for the modifications) I've had a rummage through the shed and found exactly what I require mechanically.</p><p></p><p>Based on Luis recommended diameter for the 8.4GHz feed system and converting these to the 7.5GHz Milsat band by fraction, gives an internal diamter of 29.15mm.</p><p>The usual aerial mast used around here is the good old imperial size of 1 1/4", I have a offcuts of old and new aluminium in spades, and the first piece out of the shed has the internal diameter of 29.15mm, spot on !</p><p></p><p>Next I need to drill and tap the top section to enable fitting of the probe components inside.</p><p></p><p>The universal LNB I have for the project is fitted around a cast alloy chassis, this has an internal throat diameter of 16mm with the probes set at 90 degrees from each other via simple soldering direct to the PCB. I'm hesitant to modify any of the components already on the circuit board apart from those necessary to change the reception band so I will probably retain just one of the two probes since only one polarity is required for Milsat detection (LHCP).</p><p></p><p>If I do require RHCP then I'll turn the dielectric plate around.[ATTACH=full]120617[/ATTACH]</p></blockquote><p></p>
[QUOTE="Channel Hopper, post: 1061553, member: 175144"] Since I am a bit stuck awaiting components to arrive (I have already dismantled everything I might need, in readiness for the modifications) I've had a rummage through the shed and found exactly what I require mechanically. Based on Luis recommended diameter for the 8.4GHz feed system and converting these to the 7.5GHz Milsat band by fraction, gives an internal diamter of 29.15mm. The usual aerial mast used around here is the good old imperial size of 1 1/4", I have a offcuts of old and new aluminium in spades, and the first piece out of the shed has the internal diameter of 29.15mm, spot on ! Next I need to drill and tap the top section to enable fitting of the probe components inside. The universal LNB I have for the project is fitted around a cast alloy chassis, this has an internal throat diameter of 16mm with the probes set at 90 degrees from each other via simple soldering direct to the PCB. I'm hesitant to modify any of the components already on the circuit board apart from those necessary to change the reception band so I will probably retain just one of the two probes since only one polarity is required for Milsat detection (LHCP). If I do require RHCP then I'll turn the dielectric plate around.[ATTACH=full]120617[/ATTACH] [/QUOTE]
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DISH SETUP: Single sat, Multi-Sat & Motorised
X band Milsat and Deep Space Set-up
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