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https://www.qrz.com/db/EA3PP Check out his qrz page he shows all the keys he makes. Just email him for a

Hello Alessandro. The schematic can be found http://www.hfsignals.com/wp-content/uploads/2019/12/ubitxv6.pdf P1 can be used for voltage input.? It would?bypass the switch and input protection diode

AMBE owns the implementation of the open standard in their silicon, not the specification the chip was designed to - that was designed by JARL and is an open standard. As others noted, open source

I do t think they are doing anything wrong, there are several approved radios that support HF DSTAR -IC-9100, IC-7100, IC-705 - it isn't a hobbyist experiment so much as an under-utilized mode

Hi, This is all interesting information. I'm back in the reading mode exploring the things that have come up in the posts. One would think that "advanced multi-band excitation coding" (AMBE) being

One more question: which is the tx and rx bandwidth? For example, if I wanted to create a wide FSK mode, just like 3G or 4G ALE (rev C or D of MIL STD 188-141 and 188-110), would it be possible? 73

I'm sorry, I was not able to find the related topics in past messages, so once more a questione about these connections. Is there anyone can exp'lain what are the P2 and P5 connectors?? I understood

I bought a key kit from a http://americanmorse.com/ bit back. Not sure if that's the sort of product you're looking for or not. Reed

A couple of you have shown keys that have been made by various amateurs who manufacture them for sale.? Perhaps those of you who have shown them would be kind enough to send me contact info for these

yepp ... freedv runs on smartmic (sm1000) or inside mchf qrp rig (both with an stm32 chip) dg9bfc sigi Am 15.10.2021 um 21:28 schrieb Jerry Gaffke via groups.io:

Thanks, I wasn't aware of the open source codec. Jerry, KE7ER

The D-Star spec might be public, but it all seems rather murky. As you say, it is implemented by buying something like that proprietary ABME chip,. FreeDV, on the contrary, has code available that can

AMBE is just the audio codec (source coding), it has nothing to do with the actual channel coding (modulation), right? And indeed, AMBE patents already expired some time ago... and there are some

The d-Star mode is open source, the chip that the two radio manufacturers use is proprietary, but it is only out of convenience that Icom and Kenwood use the AMBE vocoder. Just as Yaesu and Alinco use

Thanks Hans. Now I understood. And indeed, a well optimized modem with good FEC using single carrier FSK can be very good for digital communication too, as you mention. I want one! Lets us know when

Understood. Indeed, very neat optimized design. Thanks Jerry. Rafael

I believe these are the current regs for the USA:? ? ?http://www.arrl.org/part-97-text According to 97.305(c), emissions described in 97.307(f).3 can be used on HF below 10m, Here is the text of

Tom, I like where you are going with this. I have zero interest in a proprietary codec like DStar on HF.? Or on VHF for that matter. Having looked into FreeDV a few years ago, am convinced that's a

Hi, I’ve ben doing a bit more reading on amateur radio digital voice modes used on HF. To focus on one possibility for a digital voice mode that may be compatible with nonlinear RF finals, I

Are you shorting the J1 'jumper' on the on the TFT module to put it into "5V tolerant" mode? Gary