Very Differrent Result -- OUTPUT DIODES from other filters also now connected.
1.? The 21 MHz signal still goes directly through the upper LPF to the antenna
2.? The HV voltage supply is connected (but I have not measured whether it is working properly and this is crucial!)
3.? The input diodes fromthe OTHER LPFs are now connected
4.? And new here, the OUTPUT diodes from the OTHER LPFs are now additionally connected.
AND WE HAVE HARMONICS --
Here is the schematic that I think applies:
And here is a photograph of the actual soldering:
SO NOW there are lots of questions:
1.? Is the HV power supply working?
2.? Are the switching diodes all reverse biased (every one of those should be reverse biased?
3.? How does this happen, since all of the other filters' cutoff frequencies are WAY LOWER ANYWAY!!? Even if one of the other filters were TURNED ON, it should not be passing 42 MHz nor? 63MHz.
4.? Are the back-biased diodes somehow creating the harmonics???
Anyone got ideas or explanations???? ?I'm all ears as I work toward the next experiment, whatever it is.
73
Gordon KX4Z
