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EN 300 328 clause 4.3.4.3.2 

Remove the antenna from the EUT and then connect a low attenuation cable from the antenna port to the 
spectrum. 
Set the spectrum analyzer: RBW = 100 kHz. VBW ≥ 100 kHz. Sweep = auto; Detector Function = Peak. Trace 
= Max hold. 
Allow the trace to stabilize.    It may prove necessary to break the span up to sections. in order to clearly show 
all of the hopping frequencies.    The limit is specified in one of the subparagraphs of this Section. 
Set the spectrum analyzer: start frequency = 2400MHz. stop frequency = 2483.5MHz. Submit the test result 
graph. 

 
 
 
 
 

 

               
Antenna  
 
EUT   

   

 

Receiver 

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Total channels are 79 channels 

 

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EN 300 328 V1.7.1 4.5.3: A medium access protocol is a mechanism designed to facilitate 

spectrum sharing with other devices in a wireless network. 

A medium access protocol shall be implemented by the equipment. 

On the basis of the latest list of harmonized standards under the R&TTE Directive 1999/5/EC which was 

published on October 23, 2012 in Official Journal C321 contains the following (mandatory) guidance: The   

efficiency  of  the  various  sharing  mechanisms  can  be  assessed  using  the  appropriate  

clauses  of  EN  300328 version  1.8.1.” 

In addition, this requirement does not apply for equipment with a maximum declared RF Output power 

level of less than 10 dBm e.i.r.p. or for equipment when operating in a mode where the RF Output power 

is less than 10 dBm e.i.r.p. 

Adaptive Frequency Hopping equipment is allowed to operate in a non-adaptive mode providing it 

complies with the requirements applicable to non-adaptive frequency hopping equipment. 

Adaptive Frequency Hopping equipment is allowed to have Short Control Signalling Transmissions (e.g. 

ACK/NACK signals, etc.) without sensing the frequency for the presence of other signals. See clause 

4.3.1.6.3. 

Adaptive Frequency Hopping (AFH) equipment uses a Detect And Avoid (DAA) mechanism which allows 

an equipment to adapt to its environment by identifying frequencies that are being used by other 

equipment. 

Adaptive Frequency Hopping systems shall implement either of the DAA mechanisms provided in clauses 

4.3.1.6.1 or 4.3.1.6.2. 

This transmitter device is frequency hopping device, and complies with EN 300 328 4.3.5 

standard. 

This device uses Bluetooth radio which operates in 2400~2483.5MHz band. Bluetooth uses a 

radio technology called frequency-hopping spread spectrum, which chops up the data being 

sent and transmits chunks of it on up to 79 bands(1MHz each; centered from 

2402~2480MHz) in the range 2400~2483.5MHz. The transmitter switches hop frequencies 

1600 times per second to assure a high degree of data security. All Bluetooth devices 

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participating in a given piconet are synchronized to the frequency-hopping channel for the 

piconet. The frequency hopping sequence is determined by the master’s device address and 

the phase of the hopping sequence (the frequency to hop at a specific time) is determined by 

the master’s internal clock. Therefore, all slaves in a piconet must know the master’s device 

address and must synchronize their clocks with the master’s clock. 

Adaptive Frequency Hopping (AFH) was introduced in the Bluetooth specification to 

provide an effective way for a Bluetooth radio to counteract normal interference. AFH 

identifies “bad” channels, where either other wireless devices are interfering with the 

Bluetooth signal or the Bluetooth signal is interfering with another device. The AFH-enabled 

Bluetooth device will then communicate with other devices within its piconet to share detail 

of any identified band channels. The devices will then switch to alternative available “good” 

channels, away from the areas of interference, thus having no impact on the bandwidth used. 

This device was tested with an Bluetooth system receiver to check that the device maintained 

hopping synchronization, and the device complied with these requirements for CE153DR 

and EN 300 328 V1.7.1 4.5.3. 

Pseudorandom Frequency Hopping Sequence Table as below: 

Channel:08,24,40,56,40,56,72,09,01,09,33,41,33,41,65,73,53,69,06,22,04,20,36,52,38,46,70,

78,68,76,21,29,10,26,42,58,44,60,76,13,03,11,35,43,37,45,69,77,55,71,08,24,40,48,72,01,72

,01,25,33,12,28,44,60,42,58,74,11,05,13,37,45 etc. 

The system receiver have input bandwidths that match the hopping channel bandwidths of   

their corresponding transmitter and shift frequencies in synchronization with the transmitted 

signals. 

This requirement does apply for equipment