Questions about power ratings and restrictions, including maximum power by law or for certain components, or about calculating power in certain situations.
Questions tagged [rf-power]
135 questions
10
votes
1 answer
Why bother to have a high power base station when mobile units are generally low-power?
I want to find out why, say in a GSM/cellular system, a base station can be up to 50 watts however the mobile units can be only 100mw (for example).
Surely if the base station ever uses 50w to reach a mobile at long range, the mobile will have no…
code_fodder
- 215
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7
votes
3 answers
decibels as ratio and dBm as absolute values
I am just trying to understand the nitty gritty of using decibels and absolute measurements in dBm. I see them referred to routinely in RF, and using reference sheets I can understand enough to make sense of gains and losses, but I would like…
nanker
- 173
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5
votes
1 answer
Does the Crystal Radio really work?
I am in 12th std, the reason why I am mentioning this is that we are given a PROJECT to do in Physics subject. And then one day I searched the internet and found this amazing thing called 'Crystal Radio'. And when I showed it to my group(since it is…
radiantshaw
- 169
- 3
3
votes
3 answers
Peak Envelope Power (PEP) = Transmitter Power?
I need to determine the Peak Envelope Power for the VSAT station. Given that the modulation is not AM, would it be correct to assume that the PEP will be the same as transmitter power?
gsimonen
- 41
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3
votes
1 answer
Restoring full output power to rig with tube finals
I have a TS-830S that was initially doing about 60W in CW at 10m and 70W at 40m. I've heard these things are capable of at least 100W.
Determined, I started doing research on what components to look at in addition to the tubes. I'm able to get ALC…
Paul
- 781
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- 16
1
vote
1 answer
Impact of keying-up in yagi beam 1.5m (or 5ft) away on 2m FM?
Asking for a friend, of course, this homebrew yagi is probably somewhere between 3 and 6dB gain (not yet analysed) and was aimed about +30 degrees off-center, tilted 10-20 degrees upwards, transmitting 50W on 2m. 'They' were standing side-on,…
luxpir
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