The ats25 AMP has an LNA, does it work well ? Does it have good reception with or without the LNA ? Hi, In my view, the LNA does appear to work (provides RF gain), but I can’t compare the performance against the ATS25 Max Decoder. In some cases, it may provide too much gain and therefore cause over...

Can anyone tell me if it is possible to decode the PSK31 with an ats25 AMP ? Yes, it should be possible with the V4.17 firmware. However, it should be noted that the ATS25-AMP is not officially supported (see previous messages). The setting.ini file needs to be updated and downloaded to the receive...

Hi, Yes, I realise that is what is done in the Max Decoder. However, even will filtering and linear regulators with high PSRR, there is inevitably going to be a bit more noise (conducted and radiated) than without the boost converter. The overall power efficiency is going to be around 60% and probab...

Hi, I used a similar charge pump, MP9361 which was £0.71 in the the UK. I tested FT8 and RTTY decoding down to a DVM measured battery voltage of 2.8V and everything seems fine, the charge pump was still driving 5V to the DIGI decoder circuits. On the downside, I did notice some noise at the switchin...

Hi, I have not made this change to my ATS-25 AMP, it was an observation after looking at the circuit diagram of the DIGI decoder. It may be the case that without increasing the VCC to the LM386 and LM567, the circuit will still not behave correctly. The change could be simplified without shorting ou...

An observation on the DIGI decoder circuit is that the low voltage failure in CW/RTTY mode may be due to the voltage levels presented to the ESP32. The output of the LM567 (Pin 8) is open collector, so the logic high level is set by the resistors. The values are such that the voltage at the ESP32 do...

instead of cutting traces I wonder if just lifting the power pins for both chips and supplying them with 5v from a booster would work. It would be possible to lift the power pins to the ICs, but there is at least one pull-up resistor and also the decoupling capacitors. It’s more likely the SMD’s, o...

F8 works fine for me, which is why I was wondering what the issue was. I looked at the board too but have no idea how to id some of the chips, I am no expert. But I saw a 5v marked hole, but it only measured about 4 volts. So it seems they want to have 5v but it's not working. Hi, - 5V Although the...

Hi, Yes, I think they are great for the tinkering aspect. I would try it on FT8 (remember to set the time) and CW/RTTY decode first before making any mods, it will probably be okay. I had a look at the PCB, and I think it would require a couple of cuts/straps on the bottom side of the PCB and then t...

This is disappointing to hear. So apparently these vendors can buy your firmware and install it to radios you don't approve, and then we look and thing it's supported when it's not! I am going to complain to the vendor, who knows what they will say. Hi, For information, I have tested my ATS25 AMP a...