https://www.aliexpress.com/item/32882189639.html
Inside there is a 7.1796 Mhz crystal witch is multiplied by 256 to generate a 1838Mhz LO. Then there is a mixer, filtering with hairpin filter (obviously hand tunned), and a few LNA. There is also RF absorbing foam in the enclosure.
Strong LO leak.
Frequency : 2.4Ghz to 2.6Ghz.
CW 2.3Ghz
CW 2.4Ghz
CW 2.5ghz
CW 2.6Ghz
LO leak