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Are those Chinese knock offs cheaper? Barry

Thanks Mr. Sheldon.

https://forum.kicad.info/t/warning-avoid-all-links-to-kicad-pcb-org-use-kicad-org/31521 The original KiCad domain name (kicad-pcb.org) was recently sold to an unnamed third party that is not

Nice! Jack, W8TEE

20 watts clean! I put the transmit amplifier chain together yesterday - two 2N2219A stages followed by an IRF-510 stage to get the drive level where I needed it for the dual RD16HHF1s.? After

Hi Tom, I'm preparing a new paper in English to send for a conference soon. I let you know! ; ) Also, for images, HIFIC, for example, provides significant better compression than traditional non-AI

Just finished uploading some needed small bug fixes to our current firmware ?V1.59. ?Anyone who has downloaded it in the last few days should download it again. ?I also updated the software

Ismo, ?Hans Summers of QRP-Labs did a pretty comprehensive set of tests on the MS5351 and published his results on the QRP-Labs home page. I’ve been using them in TSW’s Teensy 4.1 Raduino Clone

Randy, Evan asked all the right questions. However, without yet knowing the answers, I'd say you need to first determin somehow if the VFO and BFO are working. If you have access to a shortwave

Wow! Things have advanced considerably. Those 1.6 kbps voice samples were better than I expected. At 5 GMAC/s, the computational load is significant but within easy reach. Jerry, KE7ER

Hi Randy, It sounds like you have a calibration issue or a component(s) INSTALLED that should not be there when using the Raduino as the VFO/LO.? The one other possibility is the BFO may not be

Hi Rafael, I see you have an interesting paper covering some experiments with the new trained neural net voice encoders/encoders used on HF radio

In need of troubleshooting help with my bitx40 with Raduino. I hooked everything up per the instructions and all appeared to be working. Unfortunately for several days, I could only hear white noise

With 1.6 kbit/s you get very good voice with state-of-the-art AI-based voice encoders (eg. LPCNet or SSMGAN). Please take some time to hear: https://fhgspco.github.io/ssmgan_spco/ And try also with

The regulations are as clear as mud, but one interpretation may be that is perfectly OK to transmit digital voice at baud rates high enough for digital voice. And doing so with GMSK as well as other

I long forgot that stuff, I still have several of the Z80 chips in my parts boxes never been used for the project they were intended for. Skip Davis, NC9O

Yes, that all sounds right. You can do a lot with 1 carrier, but the more you do the more susceptible it is to noise. I am curious how much more bandwidth 2 tone GMSK needs over something using the

The codec2 with packet overheads will come to approximately 1500 bps. With the 300 baud limit, we are looking at 1500/300 = 5 bits per baud. We slice this many ways. The easiest way is to have five

That's a good description of MSK, but there is a second order discontinuity when it switches tones.? The slope of the curve makes an abrupt change there.? GMSK makes the transition more gradual, but

re, I had put a TDA2030 kit directly on my NJM2073 output, for me it worked fine, but the TDA2030 packed up and fried the NJM2073. I know that we also need to add filters to the output of the TDA2030