The triangular shape, feed point and terminating resistor combine to create a mainly cardioid receiving pattern.
Antennas · F1SYH
Pennant antenna
The Pennant is a small resistively terminated triangular loop designed for directional reception.
HF
Réception
Boucle terminée
Operating principle
Main characteristics
Typical gain
Faible
Impedance
Élevée, transformateur nécessaire
Polarization
Mixte
Difficulty
Intermédiaire
Dimensions and design
Dimensions are small compared with wavelength. Height-to-length ratio affects pattern and impedance.
Construction and tuning
Step 1
Build a triangular frame.
Step 2
Install a non-inductive resistor.
Step 3
Place a transformer at the feed point.
Step 4
Isolate the coaxial cable with a choke.
Step 5
Point the null toward the unwanted source.
Advantages
- Moderate size.
- Useful rear null.
- Broadband reception.
- Can be rotated or switched.
Limitations
- Low received signal.
- May require a preamplifier.
- Transformer is critical.
- Nearby objects affect adjustment.
History and origin
The Pennant belongs to the family of small terminated loops developed for directional lower-band reception.
Safety
This is a receiving antenna and must not be connected to transmitter power.