Kenwood SW-200 - Versionsgeschichte

Dl8rds am 26. April 2008 um 18:43 Uhr

2008-04-26T18:43:17Z

Dl8rds am 13. Dezember 2007 um 23:35 Uhr

2007-12-13T23:35:41Z

Dl8rds am 9. Dezember 2007 um 01:35 Uhr

2007-12-09T01:35:58Z

Dl8rds am 4. November 2007 um 17:35 Uhr

2007-11-04T17:35:33Z

Dl8rds am 4. November 2007 um 17:29 Uhr

2007-11-04T17:29:13Z

Dl8rds: New page: The Standing Wave Ratio is the "ratio of the amplitude of a partial standing wave at an antinode (maximum) to the amplitude at an adjacent node (minimum), in an electrical transmission lin...

2007-11-04T17:12:05Z

New page: The Standing Wave Ratio is the "ratio of the amplitude of a partial standing wave at an antinode (maximum) to the amplitude at an adjacent node (minimum), in an electrical transmission lin...

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The Standing Wave Ratio is the "ratio of the amplitude of a partial standing wave at an antinode (maximum) to the amplitude at an adjacent node (minimum), in an electrical transmission line." For a neat definition go to the [[http://en.wikipedia.org/wiki/Standing_wave_ratio original Wikipedia Pages]].

← Nächstältere Version		Version vom 26. April 2008, 18:43 Uhr
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	Yet, there's another trick: If you use an antenna tuner in your feeding line, it will eat up the reflected power and keep it out of your amplifier. In my case, I have a built-in antenna tuner in my transceiver which does the job anyway.		Yet, there's another trick: If you use an antenna tuner in your feeding line, it will eat up the reflected power and keep it out of your amplifier. In my case, I have a built-in antenna tuner in my transceiver which does the job anyway.

−	The SW-200 needs a coupler to do the measurements. I am using the [[Kenwood SWC-1 Coupler]] for shortwave and the [[Kenwood SWC-2 Coupler]] for 2m / 70cm.	+	The SW-200 needs a coupler to do the measurements. I am using the [[Kenwood SWC-1 Coupler]] for shortwave and the [[Kenwood SWC-2 Coupler]] for 2m / 70cm, as well as the [[Kenwood SWC-4 Coupler]] for 23cm.

← Nächstältere Version		Version vom 13. Dezember 2007, 23:35 Uhr
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		+	[[Image:Kenwood_SW_200.jpg\|400px\|right]]
	The Standing Wave Ratio is the "ratio of the amplitude of a partial standing wave at an antinode (maximum) to the amplitude at an adjacent node (minimum), in an electrical transmission line." For a neat definition go to the [http://en.wikipedia.org/wiki/Standing_wave_ratio original Wikipedia Pages on SWR].		The Standing Wave Ratio is the "ratio of the amplitude of a partial standing wave at an antinode (maximum) to the amplitude at an adjacent node (minimum), in an electrical transmission line." For a neat definition go to the [http://en.wikipedia.org/wiki/Standing_wave_ratio original Wikipedia Pages on SWR].

← Nächstältere Version		Version vom 9. Dezember 2007, 01:35 Uhr
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	Yet, there's another trick: If you use an antenna tuner in your feeding line, it will eat up the reflected power and keep it out of your amplifier. In my case, I have a built-in antenna tuner in my transceiver which does the job anyway.		Yet, there's another trick: If you use an antenna tuner in your feeding line, it will eat up the reflected power and keep it out of your amplifier. In my case, I have a built-in antenna tuner in my transceiver which does the job anyway.

−	The SW-200 needs a coupler to do the measurements. I am using the [[Kenwood SWC-1 Coupler]]	+	The SW-200 needs a coupler to do the measurements. I am using the [[Kenwood SWC-1 Coupler]] for shortwave and the [[Kenwood SWC-2 Coupler]] for 2m / 70cm.

← Nächstältere Version		Version vom 4. November 2007, 17:35 Uhr
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	Yet, there's another trick: If you use an antenna tuner in your feeding line, it will eat up the reflected power and keep it out of your amplifier. In my case, I have a built-in antenna tuner in my transceiver which does the job anyway.		Yet, there's another trick: If you use an antenna tuner in your feeding line, it will eat up the reflected power and keep it out of your amplifier. In my case, I have a built-in antenna tuner in my transceiver which does the job anyway.
		+
		+	The SW-200 needs a coupler to do the measurements. I am using the [[Kenwood SWC-1 Coupler]]

← Nächstältere Version		Version vom 4. November 2007, 17:29 Uhr
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−	The Standing Wave Ratio is the "ratio of the amplitude of a partial standing wave at an antinode (maximum) to the amplitude at an adjacent node (minimum), in an electrical transmission line." For a neat definition go to the [[http://en.wikipedia.org/wiki/Standing_wave_ratio original Wikipedia Pages]].	+	The Standing Wave Ratio is the "ratio of the amplitude of a partial standing wave at an antinode (maximum) to the amplitude at an adjacent node (minimum), in an electrical transmission line." For a neat definition go to the [http://en.wikipedia.org/wiki/Standing_wave_ratio original Wikipedia Pages on SWR].
		+
		+	Quite plainly you can define it as the ratio of the transmitted power flowing from the transmitter into the antenna, compared to the reflected power which the antenna cannot consume and convert into radiated power.
		+
		+	A bad antenna which is not in resonnance with the signal fed into it will reflect much of the input power back into the exiter (=power amplifier), causing many unwanted effects like arcs due to voltage overlays and enormous currents exceeding the specifications of many components. A short circuit somewhere in the feeding line has exactly the same effect, reflecting the vast majority of the emitted power. In short, your power amplifier may simply cease to work. In case of overheated transistors, this may happen rather silent, or in case of exploding capacitors, it may be a rather audible event.
		+
		+	If you want to prevent this, you need a small measuring device which tells you how much of the emitted power flows back. Many transmitters can stand SWRs of 1:1.5. Valve transmitters may even stand SWRs of 1:2, but above is very critical anyway. Off course the bad effects come from the voltages and currents in your amplifier, and if you limit yourself to 5 watts on a 100 watt machine, you can probably afford to unplug your antenny entirely while transmitting. Or you can pick any copper rain gutter as an antenna. But yet be careful: A short curcuit once caused the grids in my TS-520S amplifier valves to melt!!!
		+
		+	If you know that your SWR is below 1:1.5, you can be happy. The SW-200 helps me to control my environment and to prolong the life of my TS-930SAT.
		+
		+	Yet, there's another trick: If you use an antenna tuner in your feeding line, it will eat up the reflected power and keep it out of your amplifier. In my case, I have a built-in antenna tuner in my transceiver which does the job anyway.