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On this day, 48 years ago
20 July 2017 | by 
Here men from the planet Earth
First set foot upon the Moon
July 1969, A.D.
We came in peace for all mankind
Neil A. Armstrong Michael Collins Edwin E. Aldrin Jr.
Astronaut Astronaut Astronaut
Richard M. Nixon
President, United States of America
To read about the communications systems that the Lunar Module employed, here are two good links from the NASA Archives: https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19720023255.pdf and https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20090015392.pdf
The S-band transceiver was the primary transceiver used for TV, telemetry, biomedical data, and voice communications from the Lunar surface. It had an output power of 750 mW (QRPp!). That signal then went to the S-band power amplifier, which boosted the signal to an outstanding "QRO" signal of 18.6 Watts.
72 de Larry W2LJ
QRP - When you care to send the very least
2 Responses to “On this day, 48 years ago”
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- Matt W1MST, Managing Editor
page 7 in the 1972 NASA report
Keyed continuous wave (emergency key)
page 11 op. cit.
Emergency key – Copy accuracy: 70% at 25 characters/minute
Morse telegraphy?
Cool! I didn’t see that. Makes sense as a last ditch back up.