Suggestions to improve PS operation on 7k DLE Mk2.5?
Posted: Fri May 26, 2023 9:55 pm
I am looking for ideas or suggestions on how PureSignal performance can be improved. The factory spec for the EP4CE 7000 DLE Mk2 is -68 IMD3 on 20m @ 100w, but I have never been able to do better than maybe -50 to -55 IMD3, with either the inbuilt coupler or an external coupler.
Following are measurements on 20m, 14.1 MHz at 100w into a 50 ohm load. The radio is using the inbuilt coupler, additionally the spectrum analyzer is fed with a -55 db sampler placed between the radio and the 50 ohm load, with an additional 20dB of attenuation to ensure we are seeing the real signal and not intermodulation generated in the spectrum analyzer.
I was curious about the signal feeding the 100w PA, so for reference here is the output of the Orion Mk2 card with the PA disabled, both PS OFF and PS ON.
Would this be a defect? What do you measure from your 7000 DLE MK2, and how can it be made better?
Following are measurements on 20m, 14.1 MHz at 100w into a 50 ohm load. The radio is using the inbuilt coupler, additionally the spectrum analyzer is fed with a -55 db sampler placed between the radio and the 50 ohm load, with an additional 20dB of attenuation to ensure we are seeing the real signal and not intermodulation generated in the spectrum analyzer.
I was curious about the signal feeding the 100w PA, so for reference here is the output of the Orion Mk2 card with the PA disabled, both PS OFF and PS ON.
Would this be a defect? What do you measure from your 7000 DLE MK2, and how can it be made better?