Vertical Div 10 dB, Horizontal Div 200Hz. Two Tone Test Close In IMD with 2 RF Gen 200Hz apart at 14.200 MHz. Level at ANT is 2x -73dBm
Single Tone RF GEN at 14.200 MHz level - 70dBm (about S9)
DNF ON: notched completely the -70dBm one tone RF GEN
DNF ON in presence of 2 same level strong signals at -70dBm. Result is only distorsion. See text below how to avoid that.
2.4 kHz Main RX BW in an empty 10m band at max sensitivity (amp 2 ON)
Compare to the previous 2.4 KHz BW pictures, but DNR is ON. Count vertical Div height from base and compare.
Manual Notch tuned midpassband at Default Notch Menu settings. You have 16 DNR settings to try.
CLICK onto the above pictures to see 7 different interesting test condition pictures about:
- TWO TONES INBAND AUDIO IMD (200Hz close spacing)
- DNF autonotch test
- DNR test
- IF Manual Notch test
In the Two Tones INBAND AUDIO IMD test
picture (the upper left one) I can see a very clean
audio spectrum (the peak in the left could be a short of artifacts in the
and good DNR performance.
Not satisfied by DNF in presence of TWO strong signals
of equal power: Yaesu Manual warns to use first of all the very good manual
notch to notch out one of the two signals, the stronger one, and then use,
successfully, the DNF.