15 Results for "fl2k"

FL2k Experiments
Project by Ted Yapo
Exploring the FL2k USB-to-VGA dongle for signal generation
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SineStick
Project by Carbon
What is the opposite of an RTL-SDR? This.
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FL2K Breakout
Log from AM Band Voice Frequency Marker
I threw together a quick breakout for the fl2k dongle so I can hook it up with all the connectorized microwave junk I've accumulated over the years from ebay. There are min-loss pads on there for converting the 75-ohm output of the VGA channels...

osmo-fl2k FTW!
Log from AM Band Voice Frequency Marker
I read about the osmo-fl2k program on the blog last week, and ordered one of the USB-VGA dongles from ebay immediately. Within a few minutes of opening the package I had it spewing RF all over the bands (which is awesome and terrible at the same...

fl2k rates through different ports
Log from AM Band Voice Frequency Marker
I used the fl2k_test program to check the sample rate I could get through various USB interfaces. First, through a motherboard USB3.0 connector: $ fl2k_test -s 162e6 Reporting PPM error measurement every 10 seconds... Press ^C after a few minutes. real...

Tangent #0: Arbitrary Waveform Generator
Log from The Rise and Fall of Pulses
While considering my next move, I thought it would be useful to have a simple multi-channel arbitrary waveform generator. The first thing to come to mind was the FL2k USB-to-VGA dongle and osmo-fl2k software library. I put together a python module for...

Updated Breakout PCB (again!)
Log from FL2k Experiments
I modified the breakout PCB to include the +5V line, which I had overlooked before. The FL2k dongles, at least the ones I have, do supply 5V on this line. The latest design is in the GitHub repo, and the PCB is shared on OSH Park.I think...

FL2k Experiments
Details from FL2k Experiments
This project is going to happen in the build logs: I'm basically treating this as a blog for ongoing experiments with the FL2k dongles. This is a spin-off from #AM Band Voice Frequency Marker where I initially used this device to implement a project...

Interpolating with transmission line?
Log from FL2k Experiments
So, I started playing around with transmission line models for generating short sampling pulses, and it occurred to me that you could use a transmission line to interpolate between DAC samples. It's kind of like doubling the sample rate just using...

AM Band Voice Frequency Marker
Details from AM Band Voice Frequency Marker
The idea is simple: generate an entire broadcast band of stations at once. The first prototype (software-only) makes each station announce its own frequency in a synthesized voice. This is convenient for aligning and testing antique or simple radios,...

Stroboscopic Converters as Sampling Oscilloscopes
Log from The Rise and Fall of Pulses
I just prototyped a stroboscopic A/D converter. It works, and it appears that you could make a similar one with available parts that would function as a 10 GHz sampling oscilloscope. This is where it gets interesting, people. This version won't do anything...

DAC Rolloff Compensation
Log from AM Band Voice Frequency Marker
As mentioned in the last log, the DAC on the FL2K VGA chipset introduces a frequency roll-off due to the first-order hold. This roll-off is sinc-shaped, with the first zero at the sampling frequency. As a result, an output at the Nyquist...

PCBs assembled; LPF tested; boards shared
Log from AM Band Voice Frequency Marker
The PCBs for the breakout board and lowpass filter arrived yesterday. The VGA connector fit, but the holes don't leave much room for tolerances. I updated the PCBs in the GitHub repo with the hole sizes recommended on the datasheet, although...

DAC Impulse Responses
Log from FL2k Experiments
I wanted to copy these figures from the Maxim application note, but they're copyrighted and whatnot, so I wrote some quick python to calculate Fourier transforms for piecewise-constant functions and drew my own. I would have paid good money for...

Hack Chat Transcript, Part 1
Log from Software Defined Radio Hack Chat
OK, everyone, it's noon here in the Pacific time zone, so let's get started. Today we have @Signals Everywhere/KR0SIV to talk about software-defined radio, which I can't believe we've never done a Hack Chat about. @Signals Everywhere/KR0SIV - Welcome!...