Field-Strength Meter

New name

Not sure which of these I want to build first.
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[Collinson Field Strength Meter|http://www.zen22142.zen.co.uk/Circuits/rf/sfsm.htm]
[http://panoptic.com/rking/file/up/CollinsonFieldStrengthMeter.gif]
Pros: Very, very simple.
Cons: It doesn't tune or amplify. As configured above, it's set for VHF.

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[VR2ZXP Field Strength Meter|http://web.archive.org/web/20080309004858/http%3A//www.qsl.net/vr2zxp/project/fieldmet/fieldmet.htm]
[http://panoptic.com/rking/file/up/VR2ZXP.jpg]
[http://panoptic.com/rking/file/up/VR2ZXP-schematic.jpg|width=550]
[(Full-Size)|http://panoptic.com/rking/file/up/VR2ZXP-schematic.jpg]
Pros: Simple, I have the parts already, and advertised as really wide-band (100kHz to 200MHz).
Cons: I doubt it does what the others do---it doesn't tune or amplify.

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[Talking Electronics's MkI|http://talkingelectronics.com/projects/FieldStrengthMeterMkl/FieldStrengthl.html] - Pair-of-NPN version.
[http://panoptic.com/rking/file/up/mkIfsm.gif]
This one seems somewhere between the above and below designs.
Pros: Amplification, good docs, PCB.
Cons: More complex than the above, but without the tuning of the below, PCB (I'd almost rather just play with my own layout of a Manhattan building technique).

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ARRL Antenna Book, Chapter 27
[http://panoptic.com/rking/file/up/W1ICP-FieldStrengthMeter-Assembled.png]
[http://panoptic.com/rking/file/up/W1ICP-FieldStrengthMeter.png|width=550]
[(Full Size)|http://panoptic.com/rking/file/up/W1ICP-FieldStrengthMeter.png]
Pros: Circuit design is similar to my SWL-40+, looks like it will be versatile with its tuning and sensitivity changeability.
Cons: Least simple

Password Summary of changes

For Our King, Only

Field-Strength Meter