04/09/2023document.xls document.xls

POWER SPLITTERS / COMBINERS KK1CW ( Walt )

(1) The power splitters shown will below enable the use of either two or four antennas.(2) The antennas and feed lines all use the same impedance of 50 ohms.(3) The MS Excel software will do all the necessary calculations for you .

50 ohmsconnectors C1 CL C2 Copper Tubing

inner outer

End caps L d D d D

conductor conductor

End caps both sides50 ohms Ratios of d/D configurationsconnectors C1 CL C2 for 50 ohms systems

2 way = 3.55 4 way = 2.5

End caps L d D 1 All coaxial feeders from connectors

C1, C2, C3, & C4

must all be the same lengths.C3 C4

Formulas : 2Half wave in free space for length in feet = 492/MHZ may be of any lengths to your transceiverHalf wave for 1/4 inch OD, length in feet = 468 /MHZZ0=128 log 10 D/d 3 ( L ) The inner conductor is 1/2 wave long.Any size of inner or outer tubing within reason may be used 4 The ends of the inner conductor ( L ) mustprovided that the ratio of the inside inner conductor OD to the be so spaced so that there is no influence outside conductor ID is configured correctly. from the closeness of the copper end caps.

5 Use copper plumbing materials(4) INPUT TO BUILD YOUR OWN

432 Enter frequence in Mhz to be used in this box.

0.5

3.55 Enter the ratio configuration for your 50 ohm antenna system in this box. ( Use 3.55or a 2 way power splitter ) ( Use 2.5 for a 4 way power splitter )

13.00 = ( L length ) in inches for the inner conductor.0.14084507 =

74.81 = Power splitter calculation impedance in ohms.13.67 = Half wave in free space ( length in inches )13.00 = Half wave for 1/4 to 1/2 OD ( length in inches )

9.02 = Half wave having 66% Velocity factor ( length in inches ) 10.93 = Half wave having 80 % Velocity factor ( length in inches )

Input your measurements for ID and OD .. for finding your impedance between D & d Formula used in this program. Ohms Ratio D/d Ohms Ratio D/d Impedance in ohms =LOG(128)*10*D/d 25 = 1.2 50 = 2.375

0.575 Enter (D) diameter in inches ohms = 37 = 1.755 52 = 2.5

0.162 Enter (d) diameter in inches 74.79 75 = 3.55 100 = 4.75

All coaxial feeds for CL connector

Enter size of outer conductor's inside diameter ( D ) in this box

The inner conductor OD size needed to make the impedance match.