The reason for the posted spreadsheet is that I noticed in using frequency meter to verify various points on the signal generator dial, that the atenuation control sometimes needed to be dialed up higher than at others depending on frequency in order to lock in frequency meter. Why? Isn't the output consistent across the selected band? Evidently not based on the measurements. So my question is why isn't the output consistent? I understand the measurment differences in the 2 meters readings (impedance), one being VOM and the other VTVM but curious why the band output has so much swing.

Are you using a audio-modulated signal or an unmodulated RF signal?

Those signal generators use harmonics to generate the higher RF frequencies. It isn't surprising that the amplitudes of the harmonics would vary. The specs for the Eico 324, for example, do not cover the voltage of the RF ouput.

Also, the sensitiviy of your frequency counter and probes may not be constant for various frequencies. For example, any capacitance will attenuate the signal.

I doubt that the voltmeters you are using are accurate at RF frequencies.

P.S. Capacitance will attenuate the higher frequency signals more than the lower frequencies.

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:Also, the sensitiviy of your frequency counter and probes may not be constant for various frequencies. For example, any capacitance will attenuate the signal.
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The meters you are using, especially the Simpson, are intended for DC and low freq. (60 HZ) AC. They will not respond correctly at hi freq. You should try an RF probe that converts the AC to DC so you meter will read more accurately.

http://3.bp.blogspot.com/_vfmOyxDCru8/Swvyai-g-6I/AAAAAAAAGpg/s_KFgKXIFLE/s1600/Classic_RF_Probe_Schematic.jpg

Also, on low cost sig generators, there is no effort made to ensure uniform output across any one band, and certainly not from band-to-band. These were compromise designs. I just finished re-working a Knight KG 650. If you look at the output on a scope, you will see the waveforms are not very sinusoidal.

By the way, an oscilloscope will give you a pretty accurate reading of output voltage, but on the highest bands... above 50 MHz... it would take a pretty classy 'scope to give you good accuracy.

Rich
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:The reason for the posted spreadsheet is that I noticed in using frequency meter to verify various points on the signal generator dial, that the atenuation control sometimes needed to be dialed up higher than at others depending on frequency in order to lock in frequency meter. Why? Isn't the output consistent across the selected band? Evidently not based on the measurements. So my question is why isn't the output consistent? I understand the measurment differences in the 2 meters readings (impedance), one being VOM and the other VTVM but curious why the band output has so much swing.
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