What can we expect from the STOCK MACO 103 C
An analysis of the antenna using EZNEC PRO4 with NEC 4 NEC5 engines.
The sizes we used are from the onine manual at MACO :
The MACO 103 C dimensions implemented in EZNEC :
(we used the dimenions specified for 27.555 MHz)
(Above the NEC input sizes Click to enlarge)
In order to keep it fair to all others:
We did not implement losses due to material or matchingsystems.
Therefor peak gain should be fraction less if measured in the real world.
NO material or matching losses were inserted !
Above the freespace azimuth plot for 27,555 Mhz.
Almost 7.5 dBI gain and nearly 30 dB front to back, this is what can be epected and is certainly a “solid” performer.
Above the gain / front to back / front to rear versus frequency.
Above the SWR pattern (a gamma-match is needed to tune the impedance to 50 Ohms)
Overall…not a bad antenna !