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I was proposing to use the FreeDV codec but use the GMSK modulation type. Or another FSK type it it is better. I don't think there's any reason not to mix and match codecs (voice encoders) and

Jerry, I thought that FreeDV was a multiple carrier mode and would require a linear amp.? Is there a version that is single carrier mode? 73 Evan AC9TU

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No. Had one in '77, but all I remember is soldering 64 21L02 in a memory board to give it a massive 8k of memory. The fumes probably wiped everything else out. -- 73 Bob? KD8CGH

I saw that video. I can type out z80 code faster on my straight key! Kidding... anyone remembers that 0x21 was ld hl, immediate? - f

Hi Jerry, That is a good idea. It is so easy to only think of transceivers now days. A separate transmitter and using the uBitx, or even a SDR, as the receiver is a good alternative. If I did modify

This teardown is an excellent example of why some chips are in short supply - https://youtu.be/UvArprBmdFA

Tom, I think you're on the right track, probably work. Though the driver stage may not be able to deliver much more power, and the uBitx output LPF's aren't really built for lots of power

LOL Thanks Farhan! The VFO is my own PCB- Arduino + si5351 from Hans. It's that mess of wires at the front :p There's another video that shows it

Finally! Multiband single conversion is such a beast! Kudos to your resilience and memory for which wire goes where! What is the vfo? - f

Hi, If I wanted to experiment with nonlinear RF finals and digital modes with my uBitx, would doing something like changing the bias and drive for the uBitx finials, driving them harder with little

Hi All, I just wanted to share progress made this weekend: https://youtu.be/TjHAERJJxjA Fully custom VFO, QRP Labs filter switching boards and filters, and... it works! -- Ryan Flowers -

Thats where the RD15HVF1 becomes useful and about the same cost. MRM

I breadboard with those “mepads” all the time. MRM

I last looked at this nearly 10 years ago, and had a rather simplistic view of possible modulation schemes. Was assuming it was either frequency shift keying between two tones using a single carrier

For those which does not know about FreeDV 2020 mode (from freedv website): "FreeDV 2020 is built around leading edge neural net speech coding (LPCNet), putting Ham radio at the forefront of digital

D-star on HF works, I already tested with a IC-7100. Of course it could be considered a "wideband" HF mode, as it uses > 6 kHz of bandwidth. The sad part is that the same IC-7100 does not support such

I can see your point. If it turns out that the people running D-Star on HF are not pushing the regulation envelope using GMSK modulation, that could mean the possibility of a digital voice HF mode

I've considered your notion of sending compressed speech slowly to get around that 300 baud thing on HF with non-linear amps. It would be interesting to experiment with, there might even be some good

Hi Gary, many thanks for very fast reply. yes I got the schematic, but anyway was not sure about those connectors, and so I preferred to ask more experts guys, Hi Well, my best thanks and wishes and