Does "40 W" on HF equal the same "40 W" of a "40 W" lightbulb?
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| Jul 31st 2019, 17:52 | |
K6PAATotal Topics: 0 Total Posts: 0 |
Is the “40 W” I use on my HF ham radio to reach the East Coast from California the same amount of power that a 40 W lightbulb uses? |
| Aug 1st 2019, 09:09 | |
W1VTSuper Moderator Total Topics: 0 Total Posts: 0 |
https://www.energy.gov/energysaver/save-electricity-and-fuel/lighting-choices-save-you-money/lumens-and-lighting-facts These days a "40 W light bulb" put out around 450 lumens but the power used depends on the technology. https://creebulb.com/40-watt-replacement-soft-white-tw-series 8.5 watts, 450 lumens high quality light but less efficient https://creebulb.com/40-watt-replacement-soft-white?___store=default 5.5 watts 460 lumens or 84 lumens/watt EcoSmart 40W Equivalent Soft White (2700K) Spiral CFL Light Bulb 9 watts 550 lumens or 61 lumens/watt |
| Aug 1st 2019, 09:23 | |
W1VTSuper Moderator Total Topics: 0 Total Posts: 0 |
https://en.wikipedia.org/wiki/Incandescent_light_bulb 40 W tungsten incandescent 1.9% efficiency 12.6 lumens/watt |
| Aug 1st 2019, 09:37 | |
W1VTSuper Moderator Total Topics: 0 Total Posts: 0 |
The power used by light bulbs is average power. These days, Part 97 defines power in terms of Peak Envelope Power or PEP. (9) PEP (peak envelope power). The average power supplied to the antenna transmission line by a transmitter during one RF cycle at the crest of the modulation envelope taken under normal operating conditions. DEC 2013 - QST (PG. 30) How Much "Punch" Can You Get from Different Modes (Feature) Table 1 Average Power for 100 W PEP Transmitter Average Compared Mode Power (W) to CW (dB) AM 25 –2.5 SSB 25 –2.5 FM 100 +3.6 RTTY 95 +3.3 CW 44 ref: 0 PSK31 75 +2.3 JT65 100 +3.5 |
| Aug 5th 2019, 12:29 | |
K6PAATotal Topics: 0 Total Posts: 0 |
Hi W1VT- Many thanks for your responses to my question!! They are much appreciated!! 73, Peter A, K6PAA |
| Aug 5th 2019, 12:30 | |
K6PAATotal Topics: 0 Total Posts: 0 |
PLUS- TNX for the reference... |
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