How to make use of that expensive analyzer you just bought
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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 bead2643250402 (3 turns)
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Laird Ferrite Core28b0375000 (2 turns)
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Laird Ferrite Core28b0375000 (3 turns)
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Laird Ferrite Core28b0375000 (4 turns)
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Laird Ferrite Core28b0375-300 (4 turns)
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Laird Ferrite Core28b0562-100 (2 turns)
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Laird Ferrite Core28b0562-100 (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
RCV (normally closed)
Xmit (normally open)
Antenna (common)
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Transmit configuration
RCV (normally closed)
Xmit (normally open)
Antenna (common)
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Return loss (SWR)
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Compensation for VSWR(2 meters and below)
RCV (normally closed)
Xmit (normally open)
Antenna (common)
5pf mica1kv
5pf mica1kv
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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
RCV (normally closed)
Xmit (normally open)
Antenna (common)
5pf mica1kv
5pf mica1kv
650 nh
Resonant at 2m
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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)