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Published byToby Alexander Modified over 9 years ago
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How to make use of that expensive analyzer you just bought
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Effective RF Suppressors
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100nh moulded inductor
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1 uh moulded inductor
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43 Material Ferrite bead 2643250402 (3 turns)
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Laird Ferrite Core 28b0375000 (2 turns)
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Laird Ferrite Core 28b0375000 (3 turns)
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Laird Ferrite Core 28b0375000 (4 turns)
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Laird Ferrite Core 28b0375-300 (4 turns)
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Laird Ferrite Core 28b0562-100 (2 turns)
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Laird Ferrite Core 28b0562-100 (4 turns)
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Antenna Relays
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These are great relays to use if you have the budget for them
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OK but I like to save $. I want to use one of these relays
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Receive configuration
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Transmit configuration
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Return loss (SWR)
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Compensation for VSWR (2 meters and below)
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Return loss (SWR) VSWR (return loss) is another problem that gets worse as the frequency increases Uncompensated 5pf added across NO and NC contacts
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Common port terminated in 50z Common port open One of the biggest issues with these relays at VHF is isolation The highest useful band appears to be 6 meters Isolation
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Compensation for poor isolation
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Compensation Compensation allows us to use this relay at 2 meters Isolation (uncompensated) Isolation (compensated with 650 nh) Return loss (compensated with 5pf shunt)
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