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Harmonic Content of Juma LF

PostPosted: 07 Apr 2014 00:14
by K2ORS
Has anyone measured the harmonic content of the Juma 136?
It seems that the 3rd harmonic is pretty strong, I am a bit worried about meeting the FCC specs.

73 Warren

Re: Harmonic Content of Juma LF

PostPosted: 04 May 2014 19:43
by VE3GSO
If you are worried about suppressing a third harmonic further, add another five pole low pass filter between the transmitter and the antenna. Two toroids and three capacitors, identical to what is already in the rig. That may also help reduce any signals from nearby broadcast transmitters getting into the receive converter.

Dave
VE3GSO