1. Classical blocking test (e.g. EN 300 220-1)
Blocking limit: Power at the antenna port
e.g. -44 dBm for Cat 2 receiver at fc+/-10MHz
Wanted Signal Generator A for EUT
Antenna port or
integrated antenna
Coupling of both
signals to the EUT
Either radiated or
Conducted (with a
combining network)
EUT
Signal generator B as interference source
Performance criterion: The receiver shall produce an appropriate output, e.g. after demodulation, a raw data signal with a Bit Error Ratio of 1e-3 without correction; Where the indicated performance cannot be measured, the performance criterion used to determine the performance of the receiver shall be declared by the manufacturer

2. Classical blocking test (e.g. EN 300 220-1)
Test procedure
Signal generator B off
Signal generator A shall be set to the minimum level which gives the wanted performance criterion of the EUT or the reference sensitivity, whichever is the higher
Signal generator A shall then be increased by 3 dB
Signal generator B is then switched on and the signal amplitude is adjusted to the minimum level at which the wanted performance criterion is not achieved.
The blocking level is then the conducted power received from generator B at the EUT antenna connector.
Putting the EUT into a
reproducable and sensitive
status
Determining the conducted
power at the EUT antenna
port where the
performance criterion ist
just met

3. Classical blocking test (e.g. EN 300 220-1)
The performance criterion is a crucial point:
the listed performance criteria such as BER/PER in HS are not always measuredable, E.g. a simple handheld temperatur sensor with integrated antenna may only have a display for the temperature, no external connector and only an error-sign within the display indicating that the device is outside the reception area
For the tests the manufacturer needs to declare an appropriate performance criterion For the above temperature sensor the declared performance criterion could be that the EUT should be put into a reception situation where the error-sign is just off
For radiodetermination devices there is no performance criterion listed in 220, but a false alarm rate could possibly be declared and measured
Experience shows that in digital systems, the first occurrence of degradation in any quality parameter is very close to the point of total system failure or synchronisation loss. This is mainly due to the error correction deployed in almost all digital systems. The necessary interference levels for first performance degradation versus sync. loss are typically only very few dB apart. This is especially true in measurements of overloading effects such as blocking and intermodulation. Due to this behaviour, the exact definition of the failure criterion (as well as the ability to measure it) is often not so important. In many cases, a simple go/no-go test can be used as the failure criterion.

4. Signal generator B as interference source
Receiver in-band, out-of-band and remote-band handling
(e.g. EN )
limit: field strength at EUT,
e.g. 0,17 V/m at fc +/-1GHz
Antenna port or
integrated antenna
Defined target in a given distance
EUT
Coupling of both
signals to the EUT
radiated
Signal generator B as interference source
Performance criterion: The wanted performance criterion is that the EUT shall indicate the properties of a given target at a given distance. The relevant properties (e.g. presence, range, relative speed, azimuth angle) shall be declared by the manufacturer; the type and RCS of the target and the distance shall be declared by the manufacturer

5. Receiver in-band, out-of-band and remote-band handling
(e.g. EN )
Test procedure
Signal generator B off
The target type (RCS), position and distance relative to the EUT shall be as declared by the manufacturer
The EUT shall be powered ON. Achievement of the relevant wanted performance criterion shall be verified.
The EUT shall achieve the wanted performance criterion, in the presence of the unwanted signals
The unwanted signal transmitter shall be powered ON at a lower level of 20 dB below the specified unwanted signal level
To simulate real use-cases, the unwanted signals level shall be increased in 5 dB steps until either the relevant wanted performance criterion is not met or the specified unwanted signal level is reached. The unwanted signal shall be held at each power step for at least 5 s.
Putting the EUT into a
status which is to be declared
by the manufacturer
Determining if the EUT
Achieves the wanted
performance in presence
of the unwanted signals

6. Differences EN 300 220-1 blocking EN 301 091-1 Interferrer handling
Limits
Power at antenna port of the EUT
Field strength at EUT
convertible
Performance criterion
Absolut limit for audio and digital systems (BER 1e-3); other criteria can be declared
All criteria to be declared by the manufacturer;
Guidance on an appropriate performance would be sensible for EN (e.g. minimum false alarm rate?)
EUT+Receiver configuration during Rx tests
Wanted signal = 3dB + Sensitivity
The relevant properties (e.g. presence, range, relative speed, azimuth angle) to be declared by the manufacturer
Guidance how to achieve an reproducable sensitive status of the EUT would be sensible for EN