One picture is worth 1000 words. So here is a video showing the product at work.
User manual: CG-1 User manual v1.0
The comb generator produces thousands of harmonics between the selected (calibrated) frequencies. The signals falling close to the calibrated frequencies are most of the times quite similar in terms of amplitude level.
Here is a table with the selected frequencies for calibration, and corresponding power level for each one of them. Note that the power levels and frequencies are slightly different for each individual unit. This is why every unit is carefully measured and calibrated in our lab during production. A printed sticker is attached on each individual unit to show the power level for each calibrated signal.
Here is a typical calibration table. Of course, every unit has its own calibrated signals
Frequency (MHz), Power (dBm) Band that can be tested
1.900 -46.6 160m
3.600 -42.1 80m
7.100 -38.9 40m
10.001 -38.2 30m
14.101 -38.1 20m
18.001 -38.1 17m
21.201 -38.5 15m
24.801 -38.9 12m
28.401 -39.7 10m
51.003 -46.7 6m
90.005 -52.3 FM broadcast
125.906 -59.0 AIR band
144.907 -66.6 2m VHF
435.022 -83.9 70cm UHF
1295.967 -97.2 23cm
1420.373 -98.0 Hydrogen line (~1.44GHz is usually calibrated in latest units)
NOTE: Any cables, attenuator or other testing equipment shown in the photographs are not included with Comb Generator. For example, you may use your own Attenuators to attenuate the generator's signal down to say S1 or S2 (on S-meter).
You can read about the thoughts behind the development of this product in our blog.