Today I have built a low-pass filter for my Propeller beacon on 30 metres. The spectrum analyzer shows the second and subsequent harmonics more than 45 db down, so I have put it on the air tonight. I am beaconing every 15 minutes using Opera mode running only 5.6 mW currently.
Here is the current setup. As you can see Eldon and I have shared the low pass filter design that he created with the aide of a design program.
I am eager, but not too hopeful that this little pennywhistle signal will be picked up somewhere this evening. We shall see. Thanks Eldon for sharing your design and the components necessary to build the low pass filter!