Digital Radio UK is happy to consider multiple applications for product variants based on the same chassis/design, based on one receiver test, subject to an appropriate level of commonality between products. Digital Radio UK will not consider multiple applications based on one receiver test if there are variations between the receivers of a nature likely to affect compliance. As receivers with an attached antenna are more susceptible to performance variation arising from model differences the requirements for commonality are tighter.

Receivers supplied with an antenna that is either attached, integral or is designed for use in close proximity to the radio (eg domestic radios). Where a manufacturer submits multiple applications based on one receiver test, they must confirm that the following items are identical between receivers:

• The module/RF circuitry and any circuit boards, their position and orientation and any software elements on which compliance depends – This is the basis for the receiver’s functionality and should be identical for applications of this nature
• Additional functionality – if a receiver includes wifi or Bluetooth for example, this can have a significant effect on sensitivity. [COMMENT – We may want to think about whether we’d be willing to consider approval of multiple products on the basis of submission of a worst-case example (eg a product with those options active) ]
• Case, wiring/cabling together with physical size and orientation of display and any battery pack – the physical layout of the circuitry and any metalwork can have a significant effect on sensitivity and variants will inevitably have different cable layouts, particularly where cases are different. [COMMENT – It may be that some case changes would be benign eg a model with a larger plastic foot
• The antenna, its positioning and any ground plane – the type of antenna and any ground plane, their dimensions and positioning relative to the rest of the receiver can have a significant effect on the receiver’s sensitivity

Receivers designed for use with a screened receive section or case and with a coaxial connection to a remote antenna (eg in-vehicle radios, in-vehicle adaptors, hi-fi tuners). Where a manufacturer submits multiple applications based on one receiver test, they must confirm the following about receivers:

• The module/circuit board and any software elements on which compliance depends are identical – This is the basis for the receiver’s functionality and should be identical for applications of this nature.
• Alternate features and functionality – that any alternate features or functionality do not interact with the product in a way that detrimentally affects compliance (eg sensitivity impacted by interference conducted back along power rails).

Please note, the above is meant as a guide, and Digital Radio UK will look at all applications individually. Any questions please email tickmark@digitalradiouk.com.