I'm assuming many of you are familiar with Larry Baysinger. A radio amateur who independently detected and recorded the transmissions from the Apollo 11 EVA using a homemade antenna.
Larry Baysinger recorded the VHF (Very High Frequency) signals coming from the antenna mounted on their PLSS (the "backpack"). Larry Baysinger did not record the Unified S-Band signals (which consisted of PM and wide band FM) coming from the LM's antenna or from the erectable S-Band antenna. This is because the wide band FM signals carried audio and video, and required a very large antenna to detect which is not possible to do in a backyard with everyday home items. As for PM, that was used only during flight. This excerpt can be found here.
The S-band downlink had two modes: PM and wide band FM. In the PM mode, used during flight, voice was on a narrow band FM sub carrier that phase modulated the main carrier along with other information. This could be received by relatively small dishes. The wide band FM mode was necessary for TV. It is a "one for all and all for one" mode that needed a very large antenna to receive anything at all; in FM it was not possible to use a small antenna to pick up just the audio.
For this reason, Larry Baysinger chose to detect VHF signals with a frequency of 259.7 MHz coming from their PLSS.
Now my question is: what was the transmitting power of those VHF signals? Different websites have different results. For example, this website claims that the radio transmitting power was 12 Watts.
The NASA astronauts didn’t know it, but WHAS radio technician Larry Baysinger and his journalist friend Glenn Rutherford had tapped the frequency of the 12-watt radios — walkie talkie-type communicators — used by Edwin “Buzz” Aldrin and Armstrong on the moon’s surface.
On the other hand, this Quora answer (the second one with the brown-ish photo) states that the radio on their PLSS transmitted 259.7 MHz with 0.5 Watts.
This was even more remarkable when you think that the astronauts were only using about 500 milliwatts RF power.
Now I know that a Quora answer may not be the best place to receive information as it is not credible, but I want to see an authentic source (preferably a NASA document or something) that displays the parameters of the PLSS, including the transmit power of their VHF radio signals.