How to make use of that expensive analyzer you just

bought

Effective RF Suppressors

100nh moulded inductor

1 uh moulded inductor

43 Material Ferrite bead2643250402 (3 turns)

Laird Ferrite Core28b0375000 (2 turns)

Laird Ferrite Core28b0375000 (3 turns)

Laird Ferrite Core28b0375000 (4 turns)

Laird Ferrite Core28b0375-300 (4 turns)

Laird Ferrite Core28b0562-100 (2 turns)

Laird Ferrite Core28b0562-100 (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

RCV (normally closed)

Xmit (normally open)

Antenna (common)

Transmit configuration

RCV (normally closed)

Xmit (normally open)

Antenna (common)

Return loss (SWR)

Compensation for VSWR(2 meters and below)

RCV (normally closed)

Xmit (normally open)

Antenna (common)

5pf mica1kv

5pf mica1kv

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

RCV (normally closed)

Xmit (normally open)

Antenna (common)

5pf mica1kv

5pf mica1kv

650 nh

Resonant at 2m

Compensation

Compensation allows us to use this relay at 2 meters

•Isolation (uncompensated)

•Isolation (compensated with 650 nh)

•Return loss (compensated with 5pf shunt)