This fantastic antenna was featured in the May 1983 issue of "73 Magazine," pages 54-55.
Assembly was straightforward and problem-free.
This fantastic antenna was featured in the May 1983 issue of "73 Magazine," pages 54-55.
I quickly tested the MRDDZ BS "band-stop filter." The results weren't satisfactory:
Measuring only the throughpass
Marker 2: 150 MHz
no 2m amateur radio - no AIR-band - no 136 WX satellites ...
88,5 MHz: -11,4 dB / 108 MHz: -21,4 dB
The efficiency of this broadband loop antenna is naturally low. The advantage is the broadband nature of the antenna.
The diameter is 1.2 metres.
In 40mB the efficiency is too low when transmitting, 30mB and 20mB are okay. From 17mB upwards the diameter is too large. The reception is not so strong but relatively quiet.