ATS25 AMP
Добавлено: 16 фев 2024, 22:16
As a user of the ATS25-AMP, please see a summary of my findings below.
On inspection of the PCB, an inferred simplified block diagram of the additional RF circuitry is shown attached. These functions have not been characterized.
- Impedance selection: 50Ω, HI-Z.
- Filtering: Low-Pass and Band-Pass.
- Low Noise Amplifier: LNA.
Note: There appears to be an HF low-pass filter (i.e. sub 30MHz) in the HI-Z path and therefore selecting HI-Z whilst receiving VHF (WFM) is not appropriate.
General
The firmware shipped on the ATS25-AMP is a hybrid version of V.16 and is not available for download.
Updating to a later version is therefore at the user’s risk.
The ATS25-AMP is not officially supported by the Harduino firmware, mainly due to the points below.
- The ATS25-AMP DIGI Decoder may not function correctly at low battery voltages.
A possible workaround is to add a low power 5V boost circuit such as a charge pump to power the Digi Decoder circuitry.
- The ATS25-AMP may show backlight flickering and/or reboots at low battery voltages.
This is the case for most of the ATS25 receivers, apart from the ATS25 Max Decoder.
The Max Decoder uses a high power 5V boost converter feeding the 3V3 on-board regulator.
Note: At battery voltages greater than 3V3, the nominal performance of the ATS25-AMP appears to acceptable and therefore provided the battery is topped up, it should operate as expected.
73, Dave
On inspection of the PCB, an inferred simplified block diagram of the additional RF circuitry is shown attached. These functions have not been characterized.
- Impedance selection: 50Ω, HI-Z.
- Filtering: Low-Pass and Band-Pass.
- Low Noise Amplifier: LNA.
Note: There appears to be an HF low-pass filter (i.e. sub 30MHz) in the HI-Z path and therefore selecting HI-Z whilst receiving VHF (WFM) is not appropriate.
General
The firmware shipped on the ATS25-AMP is a hybrid version of V.16 and is not available for download.
Updating to a later version is therefore at the user’s risk.
The ATS25-AMP is not officially supported by the Harduino firmware, mainly due to the points below.
- The ATS25-AMP DIGI Decoder may not function correctly at low battery voltages.
A possible workaround is to add a low power 5V boost circuit such as a charge pump to power the Digi Decoder circuitry.
- The ATS25-AMP may show backlight flickering and/or reboots at low battery voltages.
This is the case for most of the ATS25 receivers, apart from the ATS25 Max Decoder.
The Max Decoder uses a high power 5V boost converter feeding the 3V3 on-board regulator.
Note: At battery voltages greater than 3V3, the nominal performance of the ATS25-AMP appears to acceptable and therefore provided the battery is topped up, it should operate as expected.
73, Dave