RF probe?

[Mark S Graalman]

  Steve,

 An RF probe is really nothing more than a probe that converts
RF voltage (high frequency AC) into a DC voltage to be read
on your VTVM. The VTVM itself only has a high frequency
rating of about 50 KHz which makes it impossible to measure
RF with just the meter itself, a typical RF probe will work up to
about 150 MHz, and they typically will allow measurement
of about 1v to about 40 - 50 volts.
 With an RF probe, you could for example measure the power
output of a transmitter into a known value load. For instance,
you tune a transmitter into a 50 ohm resistive load like a dummy load,
connect the RF probe across the dummy load and lets say the
VTVM indicates 40 volts, then using ohms law, E(sq)/R
or 40 volts squared divided by 50 ohms equals 32 watts of
power. The probes DC output to the VTVM should be roughly equal
to the RF signals RMS value.

73,  Mark  WB8JKR


On Sat, 21 Feb 2004 11:29:03 EST Stephen Tetorka <StephenTetorka at CS.COM>
writes:
> Hello all:
>
> How does one use an RF probe with a VTVM?
>
> Where, how & what can be measured?
>
> Tnx
> Steve

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