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Author Topic: SWR vs reflected power at QRP levels.  (Read 6876 times)
KA0HVE
Member

Posts: 117




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« Reply #15 on: September 01, 2013, 09:34:34 PM »

I went with the OHR WM-2.  I assembled it yesterday and today.  I'm using it now.  That thing is amazing!!!

I can run my Ten-Tec Century 21 as a QRP or QRPp rig now.  And I can adjust my antenna tuner for the lowest reflected power.

My SWR meter was unreliable at 5 or fewer watts and the output reading was not at all accurate.

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AD6KA
Member

Posts: 2237




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« Reply #16 on: September 02, 2013, 12:46:35 PM »

Elecraft W1 wattmeter will autoscale 1.4, 14 and 140 Watts. Fairly easy to build in an evening or two.
http://www.elecraft.com/mini_module_kits/mini_modules.htm

X 10

I use this meter as a QRP bench power meter/SWR Bridge,
but there is no reason you can't build it into an enclosure for
field use. (You will have to solder the LED's on the opposite side of the
PC board, read the *entire* instructions *before* assembly if you are going
to mount it into an enclosure . I think I read *somewhere* that someone is
offering an enclosure for these. But it's an easy thing to make with a Dremel
Tool and some cutoff wheels)

This meter is remarkably accurate at all it's rated power values.
The Elecraft QRP meter uses "bar graph" LED's to show Forward Power
AND SWR simulaneously, which is nice. And it has a step switch to take
it through 1.4w, 14w, or 140w ranges.

If you want a DIRECT reading QRP wattmeter/SWR bridge, this kit unit,
which I have also built, is pretty spiffy:

http://www.radio-kits.co.uk/
IMPORTANT NOTE:
Go to the above link, and look on the left for the link
 "Digital SWR Meter" (There is no direct link..)
(Do NOT click on "Simple SWR Meter")

This is a very versatile and easy to build PIC/LCD Meter Kit to 50 watts or so.
You can set it up to read Forward and Reverse power simultaneously,
or Forward Power and SWR simultaneously (All of the above values
read out as numbers)

OR you can also set it up to read in "bar graph mode". It uses a blue
16 X 2 LCD but any 16 X 2 LCD's will work, and those are dirt cheap everywhere.

GL ES 73,  Ken  AD6KA
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