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Reviews For: Hendricks RF Probe

Category: SWR & Wattmeters & Dummy Loads

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Review Summary For : Hendricks RF Probe
Reviews: 3MSRP: few dollars
The Hendricks R.F. probe is a handy test device to have in
your shack. When used with an inexpensive high impedance
digital voltmeter (typically 11 megohm or 1 megaohm input
impedance), you can measure RF voltage in your solid state
circuits, and trace RF through your new designs or
malfunctioning circuits. You will be able to detect RF
voltages in the range of .25v to 50v, and accurately measure
voltages in the range of 1.0v to 50v, the range of the 1N34A
diode used in this design, well up to 30mHz. This design is
shielded to prevent picking up unwanted stray signals, or
broadcasting them to other stages while testing. It can be
used to measure RF power up to 50 watts.
Product is in production
More Info:
# last 180 days Avg. Rating last 180 days Total reviews Avg. overall rating
W5UV Rating: 2012-03-12
Simple to build and Effective Time Owned: 0 to 3 months.
Doug put together a small kit that helps you create an RF Probe that does the job. Easy to assemble with a small but good quality board. In just a short amount of time the probe is built and works just as it should! Nice job Doug!

Dennis W5UV
KC8LTL Rating: 2011-05-25
Good basic test equipment Time Owned: 0 to 3 months.
Electrically, this is a trivial design that has been in ARRL Handbooks for a really long time. It is just three parts - a capacitor that lets RF through but blocks DC, a diode to convert the remaining RF signal into DC, and a scaling resistor. It seems so simple that it seems a waste to spend money on a kit for this instead of just Homebrewing your own.

On the other hand, the physical packaging for this item seems both solid and precise enough to get into small circuits. So when I needed to get my own instead of borrowing from others, I got this kit.

Assembly is pretty easy. Probably the hardest part is filing the brass rod into a fine tip and narrowing the other end for the eyelet connector, but with even a hand drill and file, this is pretty easy.

It works, and it both looks better than what I would have made from scratch, as well as being more identifiable for when I look for it in a tool box.

Of course it is not as accurate as an oscilloscope, but it is a LOT cheaper and more portable. It certainly can help you with signal tracing a problematic circuit.
KD7RDZI2 Rating: 2009-06-23
very useful device Time Owned: 0 to 3 months.
Simple design. Simple instructions. Easy to use. Allows to detect malfunctioning just using an ordinary cheap voltmeter. Moreover using a simple formula you can read the output power of your rig up to 50 watts.