Transmit power limited to 3W
Posted: Fri Jan 22, 2021 7:42 pm
Hello,
I've bough a HL2 but I face issue with SDRConsole regarding the output power.
Basicaly i can't have more than 3W of output but I got 5W using Quisk.
I've tried to understand why and inspected network packet between my computer and my HL2 and I discovered that the "drive level" is set to 240 (max is 255) and I didn't find any view to change it.
I know there is a slider in TX DSP + config per band but even when I change the slider / config per band SDRConsole still send drive level 240 to the HL2.
Here is the both doc I used to understand the packets content :
-https://github.com/TAPR/OpenHPSDR-SVN/b ... _V1.60.doc
-https://github.com/TAPR/OpenHPSDR-Firmw ... umentation
In the "USBprotocol....." file, it's written :
" When using Hermes or PennyLane the Transmitter output level is set by the drive level value (C0 = 0b0001001x, C1 = 0x00 to 0xFF) and not by the amplitude of the I&Q signals. These are held to a peak value of +/-1.0 by AGC action in the PC DSP code. When using Penelope the amplitude of the I&Q signals controls the output level. Set the drive level (C1) to 0x00 when Penelope is selected and whilst the transmitter is not active."
I'm a bit confused because when i move the drive slider to the left it lover the power ouput (even if the drive level remain the same) so it looks like the "Penelope" way to do not the "Hermes" one.
Could you please infirm / confirm my assumptions ?
Did I miss a screen to set the drive level ? If not is it planned in a next release ?
Thank you for the amazing job you done.
73's, F4INE Nicolas
I've bough a HL2 but I face issue with SDRConsole regarding the output power.
Basicaly i can't have more than 3W of output but I got 5W using Quisk.
I've tried to understand why and inspected network packet between my computer and my HL2 and I discovered that the "drive level" is set to 240 (max is 255) and I didn't find any view to change it.
I know there is a slider in TX DSP + config per band but even when I change the slider / config per band SDRConsole still send drive level 240 to the HL2.
Here is the both doc I used to understand the packets content :
-https://github.com/TAPR/OpenHPSDR-SVN/b ... _V1.60.doc
-https://github.com/TAPR/OpenHPSDR-Firmw ... umentation
In the "USBprotocol....." file, it's written :
" When using Hermes or PennyLane the Transmitter output level is set by the drive level value (C0 = 0b0001001x, C1 = 0x00 to 0xFF) and not by the amplitude of the I&Q signals. These are held to a peak value of +/-1.0 by AGC action in the PC DSP code. When using Penelope the amplitude of the I&Q signals controls the output level. Set the drive level (C1) to 0x00 when Penelope is selected and whilst the transmitter is not active."
I'm a bit confused because when i move the drive slider to the left it lover the power ouput (even if the drive level remain the same) so it looks like the "Penelope" way to do not the "Hermes" one.
Could you please infirm / confirm my assumptions ?
Did I miss a screen to set the drive level ? If not is it planned in a next release ?
Thank you for the amazing job you done.
73's, F4INE Nicolas