KN4VHM Blog

SDR and DSP Resources

I have done quite a bit of mucking around with SDR stuff, so friends and other I have worked with often wonder what resources they could look at. This is my list. It has a bias towards some cellular stuff. General Tutorial For Getting Familiar with SDR: Software Defined Radio

SoftEther VPN Behind HAProxy

Thought I would share because the other other related source I know of is this. For those who don't know, SoftEther VPN is a VPN software that disguises itself as https traffic to be able to hide it's presence, so I wanted to be able to host both it and

HF

HF Band Pass Filter

Analysis of the BPF-E16 HF Bandpass Filter I got: bought from here. Center Frequency: 7.18032 MHz Bandwidth (-3 dB): 29.5420 MHz Bandwidth (-6 dB): 30.1158 MHz Quality Factor: 0.24 Low Cutoff Frequency (-3.4 dB): 1.65275 MHz -6 dB Point: 1.55381 MHz -60 dB

BladeRF

BladeRF HF Experimentation- Exp1

This post should be part of a series of posts that help document my experiments for using the BladeRF x40 on HF (3-30 MHz) with the XB-200 transverter board. Note: it is poorly written, I will improve my organization and writing as I figure out more things and do more

Filters

HF Multi-Band Pass Filter Analysis

Data for this HF filter I got. I will update this as measurements are taken