ATS25 AMP mistake update

[Mika]

Hi,
I own this model and I don't have any particular problems.
I can't decode correctly RTTY but I think the problem is me, I'm learning to use it at the same time (even though it's simple).

I'm at 3.7V currently, CW and FT8 are working without problems (I have to turn up the volume).
I'm going to let go down the voltage and see how it reacts.

The settings provided by G8PTN work for me.

[masya_v]

Всех приветствую!Прочитав данную тему решил заказать такой приемник себе,по моему он имеет право на жизнь! Хотел поинтересоваться, нужно ли покупать новый лицензионный ключ при обновлении прошивки или сохранится старый?

[Binns]

Всех приветствую!Прочитав данную тему решил заказать такой приемник себе,по моему он имеет право на жизнь! Хотел поинтересоваться, нужно ли покупать новый лицензионный ключ при обновлении прошивки или сохранится старый?

Если на приемнике установлена и активирована прошивка H-RADIO, то повторная активация при обновлении не потребуется. Ключ можно посмотреть в разделе INFO.

[Juergen1]

These users thanked the author Binns for the post:
Alphaacres

For the external supply of the
Decoders use a
Step up converter from 3V to 5-6 Volt about 3-5 Euro
then the also works
if the battery voltage of the
Device's sinking.
Greetings
Jürgen

[Binns]

For the external supply of the
Decoders use a
Step up converter from 3V to 5-6 Volt about 3-5 Euro
then the also works
if the battery voltage of the
Device's sinking.

HX4002 very cheap and easy to assemble

[G8PTN]

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 switching frequency (as expected) which ranges from 1.2MHz to 1.4MHz (fundamental) and the dominant harmonics.

I did the modification in such a way that it can be set to operate in the original configuration without the charge pump regulator.

Note:
When the battery voltage falls below the drop out voltage of the LDO regulators, the 3V3 outputs will be unregulated. This causes some flickering on the display backlight, particularly if WIFI is enabled.

73, Dave

[Binns]

When the battery voltage falls below the drop out voltage of the LDO regulators, the 3V3 outputs will be unregulated. This causes some flickering on the display backlight, particularly if WIFI is enabled.

To avoid this, you first need to increase the battery voltage using a powerful booster to 5 volts, and then get 3.3 volts using the AMS1117 regulator. How is this done in the ATS25 max-Decoder and max-Decoder II receivers

[G8PTN]

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 probably the reason for the increased battery capacity.
I think there are pros and cons with both methods.
73, Dave

[radi0]

Can anyone tell me if it is possible to decode the PSK31 with an ats25 AMP ?
Thank you

[radi0]

The ats25 AMP has an LNA, does it work well ?
Does it have good reception with or without the LNA ?

73 , SWL