HS0ZED, you may be right that the PB1547 calibrator could produce 25/100 KHz harmonics at about the same level. This is PB1314A calibrator. Notice how the 100KHz is coupled to the buffer Q3 via C7, but the 25 KHz goes directly to pin 16 via C8 and does not get amplified by the buffer. Here is PB1547. The 100 KHz output at pin 5 of the 34024 divider is coupled directly to pin 16 via C23, but the 25 KHz output on pin 3 is amplified by Q5 then added to the 100 KHz output on pin 16. In the 25 KHz position the 25 KHz amplified signal is being added to the existing 100 KHz signal via C25 ( 7 pF ) which at 14 MHz represents about 1.6K impedance. Since the calibrator signal on pin 16 sees the antenna impedance which is normally pretty low compared to 1.6K, it would seem there would be little loading effect caused by Q5. In other words, you are seeing the same 100 KHz in either the 25 or 100 KHz calibrator position. Normally there might be cancellation of the two signals at the same frequency should one be out of phase but in this case, it does not happen because the two are synchronous being from the same divider and the frequency is not so high for enough phase shift to occur. Here is the pin out of the Fairchild 34024. Is has simultaneous 25 and 100 KHz outputs.