@tubetime This means the thin cable is not 50 Ohms? | Dick Telder

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@tubetime
This means the thin cable is not 50 Ohms?

Like 23 August at 21:56 | Wall-to-wall | Open on mastodon.nu

3 comments

Tube❄️Time replied to Dick

@dtelder it's 50 ohms but it is longer, so the calibration plane needs to move.

24 August at 7:09 | Open on mastodon.social

Dick Telder replied to Tube❄️Time

@tubetime
There is magic involved. I understand that not including the thin cable will affect levels and propagation delays.
But I don't understand why it changes the frequency with lowest swr.
Perhaps the cable is to be considered a part of the antenna?

24 August at 17:26 | Open on mastodon.nu

Tube❄️Time replied to Dick

@dtelder i'm not 100% sure myself about why it caused a frequency shift, but you may be right about it being part of the antenna. the ferrite beads along the thin coax are supposed to prevent RF currents from flowing along it, but it's not perfect.

25 August at 0:39 | Open on mastodon.social