Not that is useful. The photos show the gadget. lsusb(1) reports: "ID 1a86:7523 QinHeng Electronics HL-340 USB-Serial adapter" and it shows up as a serial port on Debian. So there may be hope. However, so far I only get readings on the USB serial port at 9600 8N1 after the logo goes away by pressing the center button. I've not been able to get any response from the serial port to anything I've attempted to send it. So no obvious way to set calibration constants.
While this is somewhat duff, it's enough to verify the basic performance of the chip used. The black wire is the analog signal. Ground is the posts.
Entertainingly, it shows 0 dBm at 8000 MHz. Still works at -47 dBm noise floor at 7999 MHz. Should I request a refund? ;-)
The use case I have in mind is testing transistor gain at RF along with curve tracing, etc.
In short, a gadget to characterize non-RF transistors for use in RF applications. Pulse test for the maximum limits and generate a datasheet for what it finds so scavenged parts can be characterized in addition to unconventional applications.
Have Fun!
Reg
On Saturday, December 16, 2023 at 03:18:55 PM CST, Jim Allyn - N7JA <jim@...> wrote:
On Fri, Dec 15, 2023 at 03:03 PM, Reginald Beardsley wrote:
I have no clue why changing the frequency changes the level.
It has a cal chart built in to the firmware.
