It's only taken me about 20 years on LF to actually think about, and calculate, this... We all know we're supposed to attenuate harmonics and unwanted signals, so most LF amplifiers, especially swit
Interesting idea Andy, you are right but... ...some people can't live without the SWR meter on the transmission line: the harmonics not irradiated return toward the Tx and the SWR meter show an high
G'day Andy, When Robert AX2TAR was experimenting on 180KHz, he tried a transmitter of my design without the low pass filter. I could hear his 3rd harmonic and the 17th, 19th, 21st and 23rd harmonics.
That is, sort-of, what I expected would happen So, while the lower frequencies are under control, the low order harmonics, some filtering of the high order HF components is still necessary. But
Hi Claudio, If you have the usual configuration TX->LPF->SWR_Meter->Antenna the indicated SWR will NOT be spoiled by returning harmonics because they are attenuated by the LPF and reflected into the
Yes Clemens, I agree. I mean that without the LPF the SWR meter measure all the harmonics reflected by the antenna, so the SWR measured can be a lot higher and can be cause of MOSFETS failure. I com
