¤ Table 2.1 comprises a grid linking, by scanner designation documented in Appendix 1 where possible, average pulsing rates (PRF) and the PD or PDs may be used with that tabulated pulse rate. It should be borne in mind, when viewing this table, that:
o Where multiple PDs are shown for a given PRF, these normally represent factory-determined settings for individual systems, rather than operator-selectable alternatives. Ordinarily, individual systems will have no more than four PDs available, in the range 0.05 to 1.2 μS.
o Not all PRFs listed will necessarily be available to all systems grouped together; individual radar control boxes may have different configurations.
o Handbooks for a small number of systems specify that radar range scales may be switched from nautical miles to statute miles by replacing the PRF source crystal for one with a different value.
o The Kongsberg DataBridge-10 entry is included in this section solely for convenience since its MNR history is closely linked to that of Simrad, a re-seller of Koden systems for many years. It is the only system tabulated here that has an S-band component.
¤ Tables 2.2a (radomes) and 2.2b (open arrays) list the same systems as in Table 2.1, grouping these systems by a combination of peak power and antenna physical specifications. Antenna physical characteristics, especially, should be treated with caution, as they are derived from comparison of a diverse range of materials, from an equally diverse supplier-base When viewing these groupings, the following should be borne in mind:
o Open arrays less than 3' in length are disappearing from the Koden inventory; only the RB709A scanner, associated nowadays only with the early-90s design Anritsu RA770UA uses such an antenna.
o Care must be taken over antenna sizes. Where radomes are concerned, it is usually the external diameter that is quoted. With open arrays, it may be either the radiating element of the antenna or the turning circle; non-Koden sources often describe open-array antennas as longer than cited in Koden's documentation, typically by around 6 inches.
These tables also summarize the scan rates of the various antenna systems, including variability when this is available in literature. Where individual systems are capable of more than one turning-speed, this is depicted in the data with a plus sign between the relevant rates. In only one instance are multiple rates expressed differently, for the Kongsberg DataBridge-10 S-band antenna. In this latter case, multiple alternative rates arise because a vessel's power supply frequency are either 50 Hz or 60 Hz.
