V4.00.03X Experimental Power Control
Added 2025-04-24 16:54:28 +0000 UTCThis version is more of a diagnostic version. It gives FULL control of the PA and output power (Register 0x36 of the BK4819)
Menu 4 (TX Power) Controls the VBIAS 0 to 255 (0V to 3.3V)
Menu 5 (PA Gain) Controls the PA parameters (0 to 255)
Bits 0-2 = PA Gain 2 (0 to 7)
Bits 3-5 = PA Gain 1 (0 to 7)
Bit 6 = Unused
Bit 7 = Enable PA (Thus only values over 128 will be effective) (1=On, 0=Off)
To figure out the overall PA Gain to test, take the two values of PA Gain 1 & 2 you want and apply the following
paGain2 + (paGain1 * 8) + 128
This is intended for users to experiment and find out what settings do what on what bands as power output seems to be different for individual radios so I'm going to need some data to effectively address it as I have only what I can determine from my equipment and I only have ONE RT-900 currently.
Comments
It's not really explained in the PDF for the BK4819 it just calls them PA Gain 1 and 2. The next release will have the two separated, just PA Gain 1 and PA Gain 2 with values from 0 to 7 to try and simplify things a bit.
Marcus Dudley
2025-04-25 01:18:45 +0000 UTCMarcus do you know what the PA Gain 1 and PA Gain 2 bytes control? Using your formula it's almost acting like PA Gain 2 is controlling power to the frequency range, and PA Gain 1 is the power steps. Just curious for my knowledge.
Scott Stone
2025-04-25 00:35:04 +0000 UTCBear in mind menu 5 (PA Gain) is not linear, 255 is not necessarily the value to give maximum output.
Marcus Dudley
2025-04-24 22:58:22 +0000 UTCMenu 4 - 255, menu 5 - 255, max power 3.8W on 145.500 and 3.3 on 433.500. I cant make more power, stock fw output was around 8W. Maybe battery is low, shows 0% but working.
Marcin G
2025-04-24 21:32:26 +0000 UTC
