Koden

Appendix 1
Scanner Nomenclatures

            Koden makes extensive re-use of component designs developed for its own radar systems in the systems that it provides to other MNR suppliers, and the nomenclatures used for these components appear to be persistent - that is, the designation used by Koden is used by its customer base in their own documentation. This is particularly useful in the case of �scanner� (i.e. transceiver) designation, where the same basic characteristics may be exhibited byall systems using a standard scanner component. Tracking a scanner designation across multiple brand-names makes it possible to condense the product line to a much shorter list than might otherwise be feasible. When viewing these groupings, the following should be borne in mind:  

�       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.        

�       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 length of the radiating element of the antenna, or its turning circle; non-Koden sources often describe open-array antennas as longer than cited in Koden’s documentation, typically by around 6 inches.

           Table 1 summarizes the antenna characteristics of the principal 'Koden clan' members - Koden, Anritsu, Nobeltec, Northstar, Simrad and Si-Tex.             

            Several SI-Tex antenna systems are of uncertain origin, with different radiation and waveform patterns from those tabulated above. To avoid confusion, these are shown here:

            Additionally, there are several Kongsberg systems included in this Section solely because of Kongsberg's known relationship with Simrad, many of whose past products were manufactured by Koden. Available documentation for these systems is scant: they appear to have no manufacturer designator, and Kongsberg simply describes them as up-mast and down-mast scanners used with its DataBridge10 navigational center. Type-approval certificates for the DataBridge10 show that Kongsberg acquires transceivers from several sources: Kelvin Hughes, Consilium Selesmar and Sperry Decca (Northrop Grumman). It is not known whether Kongsberg also manufactures its own systems, but there is certainly no evidence of this in type-approval certificates.  Systems:

                        X-Band 10 kW Peak Power, 6' Open Array, 1.3° * 24° beam, 28 rpm

                        X-Band 10 kW Peak Power, 8° Open Array, 1.0° * 24° beam, 28 rpm

                        S-Band, 30 kW Peak Power, 12' Open Array, 2° * 30° beam, 25/30 rpm           

            Lastly, as of Fall 2006, there are two X-Band radome scanners, the first homegrown systems manufactured by Simrad rather than acquired from Koden, for which few technical details are available. The NavStation DX45 is known to use an 18" radome with a 5.6° * 30° beam; the larger NavStation DX60 uses a 24" dome, with a 3.8° * 30° beam. The very sketchy pulse information on these systems reveals only that they use PDs of 0.12, 0.3 and 0.8 μS.