The unit is named a “GPS Referenced Clock“. The outputs can be set in the range 450 Hz to 800 MHz. The frequency of the secondary output is dependent on the primary output frequency.
There is another version available with a single output.
The units do not tell the time, so it is not a clock in this sense; it produces accurate, square-wave “clock” output.
The unit arrived well-packaged along with its GPS antenna and USB lead. I like the plastic case for keeping the bits together. The unit is a neat, small package.
I installed the control software on my Win10 PC and connected the Leo Bodnar GPSDO to the PC via its USB lead. I attached the GPS antenna and placed the patch block on the outside of the Velux skylight. My unit is the version with two outputs. Firmware version: 1.17.
The unit took its power via the USB cable.
The “No GPS Signal” message went away. Actually, I later found that I could place the GPS antenna inside on a shelf and still get satellite lock, so the unit is quite sensitive. I have a fair bit of screening by way of foil-covered insulation reducing signals from outside.
On the software I enabled one output only.
Setting a frequency
I set the “Master” (primary) frequency to 106,500,000 Hz, 106.5 MHz and clicked Find. The software displayed:
BW: 6 (internal PLL bandwidth; 15 is optimum)
F3 Hz: 403 409
Fosc: 5112 (internal PLL parameter)
So the software found a way of setting the unit to the frequency I had chosen: 106.5 MHz.
32 mA drive strength should give 1.6 V peak-to-peak to 50 ohm.
As possible seconday frequencies, the software offered me: 106.5, 319.5 or 159.5 MHz.
Harmonics used as a frequency marker
I put a random rubber duck antenna on the output (possibly 70cm band).
144.08 MHz x 3 = 432.249 MHz
144.027 x 9 = 1296.243 MHz
257.8 x 9 = 2320.200 MHz
255.57 x 9 = 2300.130 MHz
266.69 x 9 = 2400.210 MHz
691.214 x 15 = 10.368.210 MHz
With the 19,368.210 MHz frequency, I received this on my DB6NT transverter from a dish pointing at the rubber duck. The DB6NT+K3 configuration is frequency locked to a Jupiter based GPSDO. Using the K3’s spot function gave me a dial reading of 10,368.210,003 MHz, so within a few Hz.
On the K3, the transverter off-set frequency can only be adjusted to the nearest 10 Hz, so I cannot tune it any more accurately. The LB GPSDO accuracy is probably within 1 Hz at 10 GHz; I just can’t set the K3’s internal transverter band off-set that accurately.
So I am really pleased that I can use harmonics from the LB GPSDO as frequency markers in the higher bands. I wonder whether I might be able to receive a marker in the 24 GHz band?