Accessories


    All Directive Systems antennas may be combined or "stacked" for higher gain. Antenna gain increases at a rate of about 2.2 dB per each doubling of boom length. When the physical constraints of a long boom become overwhelming,  it is a simple matter to add a similar antenna and combine the two in phase for almost 3 dB of additional gain. At microwave frequencies it is very important to have a low loss phasing harness with low residual VSWR.  Any loss here will reduce the near 3 dB stacking gain. In addition, variations in electrical length of the inter-connecting cables, can cause serious problems at microwave frequencies.
    Directive Systems routinely builds phasing harness assemblies from 50 MHz through 3.5 GHz.  Electrical phase length tolerance is maintained at 5 degrees at 3.5 GHz and about 2 degrees at 1.3 GHz.  Harnesses are tested on a Hewlett Packard 8753D 6 GHz network analyzer. All harnesses are measured and the results are tabulated in a factory database for future reference should any future need arise.
    This care in assembly means that you can install any complex array with the utmost confidence that it will work right the first time and deliver the performance that you expect from the day that it is put in use. The SYSTEMS in our name really means something!
 

Phase matched cable assemblies

1.5PL  LMR-400 Cable pair for 2 X 3318LY, 3311LY, and 23/2414LY
4PL  LMR-400 Cable pair for 2 X 1844LY 
6PL  LMR-400 Cable pair for 2 X 2345LY 
7PL  LMR-400 Cable pair for 2 X 2355LY, 4 X 2345LY, & 2 X 3333LY
(2 sets req. for 4 antennas)
8PL  LMR-400 Cable pair for 4 X 2355LY (2 sets req.) 
9PL  LMR-400 Cable pair for 4 X 3333LY (2 sets req.) 
10PL  LMR-400 Cable pair for 2 X 3347LY, & 2  X DSFO432-25
11PL LMR-400 Cable pair for 2 X DSFO222-16 
12PL  LMR-400 Cable pair for 4 X 3347LY (2 sets req.) & 2 X DSFO144-12
13PL LMR-400 Cable pair for 4 X DSFO432-25 (2 sets req.) 
15PL LMR-400 Cable pair for 4 X DSFO222-16 (2 sets req.)
18PL LMR-400 Cable pair for 4 X DSFO144-12 ( 2 sets req.)
XXPL Ask about custom phase matching solutions
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