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1/22/2020 12:12:56 PM
Posted: 9/17/2009 7:58:45 AM EST
[Last Edit: 9/17/2009 8:00:52 AM EST by The_Beer_Slayer]
Link Posted: 9/17/2009 8:24:30 AM EST
The 15 and 50 I believe is to measure output. In other words with your radio on 15 you could measure output with the 5 or 10 watt setting on the radio You could set your radio to 5 and read the SWR. Does it have a knob in the back to calbrate the SWR. I'mguessing it does it automatically
Link Posted: 9/17/2009 9:20:28 AM EST
[Last Edit: 9/17/2009 9:25:13 AM EST by Gamma762]
15w or 50w just adjusts the sensitivity of the meter to correspond with how much power you're running through it.

Power meter will measure your forward transmitter power, SWR you would read from the bottom scale. Just set the power meter to whatever is most appropriate to the amount of power you are transmitting. Don't TX more power than what you have the meter set for.

I would suggest using 10w and the 15w scale on the meter. If you have a high-SWR condition most transceivers will reduce their transmitter power and this may give you unusual readings. Using a lower power setting on transmit (but still within the range of your meter) would reduce the chance of that happening.

Without documentation or experimenting with the meter I couldn't tell you whether it's self calculating for SWR, or whether the SWR indication is only accurate at the stated forward power level. If it's not self-calculating, then using a lower than stated power level for transmit will result in a lower than actual SWR reading.
Link Posted: 9/17/2009 10:16:27 AM EST
The selection switch only applies when you are using the forward power function. Set that baby over to SWR and hook the TX to the transceiver and ANT (obviously) goes to the antenna and measure away! :) It is always a good idea to set the transceiver over to min power setting first when testing stuff... A little prudence goes a long way. Have fun.
Link Posted: 9/17/2009 10:24:29 AM EST
Link Posted: 9/17/2009 12:14:30 PM EST
Try it in the SWR position at both 5 and 10 watts and see if the reading changes.
Link Posted: 9/17/2009 1:14:44 PM EST
Link Posted: 9/17/2009 3:22:32 PM EST
Originally Posted By The_Beer_Slayer:
comet cm-200 swr meter.

there should be an SWR-vs-power correction graph affixed to the back cover. is there?


Link Posted: 9/17/2009 4:01:38 PM EST
Link Posted: 9/17/2009 5:08:42 PM EST
[Last Edit: 9/17/2009 5:08:51 PM EST by ar-jedi]
Originally Posted By The_Beer_Slayer:
yes there is.now i just needto figure it out

correct, and until you do you will not be able to make accurate measurements.
such is the nature of single needle SWR meters with no forward power null adjustment.


Link Posted: 9/17/2009 7:29:25 PM EST
Originally Posted By The_Beer_Slayer:
weird thing about antennas. my jpole hanging in the office would hit a distant repeater on low power that i have trouble hitting on the big antenna on top of the house.

Low SWR isn't necessarily an indication that everything is OK.
Link Posted: 9/18/2009 2:51:55 AM EST
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