How to make use of that expensive analyzer you just bought.

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Presentation transcript:

How to make use of that expensive analyzer you just bought

Effective RF Suppressors

100nh moulded inductor

1 uh moulded inductor

43 Material Ferrite bead (3 turns)

Laird Ferrite Core 28b (2 turns)

Laird Ferrite Core 28b (3 turns)

Laird Ferrite Core 28b (4 turns)

Laird Ferrite Core 28b (4 turns)

Laird Ferrite Core 28b (2 turns)

Laird Ferrite Core 28b (4 turns)

Antenna Relays

These are great relays to use if you have the budget for them

OK but I like to save $. I want to use one of these relays

Receive configuration

Transmit configuration

Return loss (SWR)

Compensation for VSWR (2 meters and below)

Return loss (SWR) VSWR (return loss) is another problem that gets worse as the frequency increases Uncompensated 5pf added across NO and NC contacts

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

Compensation for poor isolation

Compensation Compensation allows us to use this relay at 2 meters Isolation (uncompensated) Isolation (compensated with 650 nh) Return loss (compensated with 5pf shunt)