Re: Increased sensitivity of SWR meter

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From: thomas beierlein (tb@HTWM.DE)
Date: Sat Jun 18 1994 - 12:44:24 EDT


>
>
> I recently rebuilt the SWR meter portion of an MFJ matchbox which I intend
> to use primarily with my QRP rigs. Unfortunately the sensitivity is very
> poor at powers of <5W. The input transformer is a toroid with the primary
> being a screw through the center of the toroid & the center tapped
> secondary several turns of #30? wire. Can I increase the sensitivity by
> just adding more windings to the secondary, or is there a better approach.
> I'm really hurting for a good way to match my antennas to various QRP bands
> without it. Any advice is greatly appreciated. Thanks, de N2KTY/qrp (Gary)
>

That migth be the wrong way.
If it is a current transformer you will get more sensitivity by removing
some windings of the secondary. Try it.

Thomas DL1JBE


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