nbias's blog View Details
Posted by nbias | Mar 04, 2019 @ 09:08 AM | 2,939 Views
For the RF nerds out there flying crossfire and 1.3 GHz, here's some quick VNA sweeps of the TBS/VAS 915 MHz PCB based notch filter.

Full results and thoughts can be found here at my blogger page.

Name: IMG_20190219_123504228.jpg
Views: 0
Size: 1.87 MB

Name: IMG_20190219_123757673.jpg
Views: 0
Size: 1.31 MB
Posted by nbias | Jan 30, 2019 @ 07:22 PM | 16,627 Views
If you have one of the Foxeer Arrow Micro Pro cameras (HS1209) and have noticed incompatibility with certain OSDs, inability to maintain a sync lock with the ImmersionRC Rapidfire 5.8 Ghz video receiver (this is a known incompatibility documented here: rapidFIRE Camera/OSD/FC Compatibility) and other weirdness here's a quick mod to bypass the AC coupling cap and DC couple the video output from the camera. (Note: you will need to confirm that the video signal is going into circuitry that can handle the DC offset that will be present)

Details on the mod and results can be found here at my blogger page.

Here are a few pictures of the before and after:

Name: pre_mod - bright light.png
Views: 1
Size: 127.9 KB
Description: Pre Mod

Name: IMG_20190110_092027745.jpg
Views: 2
Size: 194.0 KB
Description: Mod

...Continue Reading