i needed a polarisation switch for my 70cm sat antenna. in the junk box was a small metal shielded 12 V SDS-relay.
the ferrite bread is mounted as close as possible to the input SMA connector. keep all connections very short.
| band | SWR |
| 2 m | ?? |
| 70 cm | 1 : 1.1 |
| 23 cm | 1 : 1.3 |
good SWR but the small SMA connectors and the SMD-C getting very hot after about 1 minute transmitting 25 W FM .
target failed but a suxessfull experiment.
when i realized the warming comes from the SMA connectors and not from the relay, i soldered RG-58 direct to the relay-boddy and terminals. result: no warming up (a good SMD-C will handle the TX power without warming)
