3 Beehive Electronics · Tel: (707) 824-9206 · info@beehive-electronics.com

rev. 2.2

8555 Lawrence Lane, Sebastopol CA 95472

Table 2

Model Number

X

3 dB Frequency

(MHz)

First Resonance

(MHz)

100C (large loop)

85.1

50

500

100A (medium loop)

65.2

1000

2600

100B (small loop)

42.2

3100

>6000

100D Stub Probe

The probe output power into a 50 ohm load and the electric field strength are related by the

following equation:

Pout = -113.2 + 20*log10(E) + 20*log10(F), or alternatively,

20*log10(E) = Pout + 113.2 - 20*log10(F)

Where

E is the electric field strength, in volts/meter

F is the frequency of the received signal, in Megahertz

Pout is the probe output power into 50 ohms, in dBm

Frequency Response:

100 A/B/C Loop Probes

The above equation is accurate within 3 dB from DC to the 3 dB point indicated in table 2. The

probes are usable at higher frequencies, but the sensitivity is uncalibrated. The first notch in the

frequency response of the probes occurs at the first resonance listed in the table. Figure 1 shows

the response of the probes vs. frequency.

100D Stub Probe

Stub probes tend to be less repeatable than shielded loop probes, due to the presence of common-

mode currents flowing on the outer surface of the probe or attached cable.

As signals are

measured, it is common to see a few dB of variation in output power as the user changes their

grip on the probe or the attached cable. Because of this, the sensitivity of the 100D is not

guaranteed. Typical sensitivity of the probe is shown in figure 2.

RF Connector:

SMB male, 50 ohms

Warranty

1 year warranty

30 day unconditional return policy