[Date Prev][Date Next][Thread Prev][Thread Next] - [Date Index][Thread Index][Author Index]

Re: Seeking info on stacked helices

I have an array of 3 16-turn helixes for 2400 MHz. The design is similar to
the Kraus 4 helix array but does not need tapered lines because 3 helixes in
parallel are approximately 50 ohms. It does work and would be fine for

When comparing my helix array to a dish with a short cupped helix feed it
has one disadvantage for satellite reception. The sidelobes of the array
pick up thermal noise which reduces SNR. The dish does present a larger wind
load but the rotator can handle it.

In his book, Kraus does provide a helical antenna design with low sidelobe
levels. However, it is impractical for S band because it requires a conical
reflector which is as long as the helix.



> but I would very much like to know if anyone have
> actually built the 4 helix construction from the
> ARRL Antenna Book on 2.4 GHz with a good documented
> result.

Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org