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AF7KR Step Attenuator

1 year ago 1266
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Description

Poor ham's step attenuator using 0.1" jumpers as switches. I glued together 2 jumpers with superglue. Resistor values are from E24 5% row.

Update 10-14-2019: Built 3 boards. There is no significant feedthrough up to 2GHz. Attenuation flatness is ok up to about 400-500MHz, then inductance of the "loops" formed by the jumpers and resistors causes significant excess attenuation.

Documents

ATT

Sheet_1

BOM

ID Name Designator Footprint Quantity
1 33f37b5370b64bdb8bd11ececb8451ac J2,J1 CON-SMA-EDGE 2
2 a796b83a989746b6a927b111af270dc5 R2,R5,R8 1206 3
3 a796b83a989746b6a927b111af270dc5 R1,R3,R6,R4,R9,R7 1206 6
4 a796b83a989746b6a927b111af270dc5 R17 1206 1
5 a796b83a989746b6a927b111af270dc5 R16,R18 1206 2
6 a796b83a989746b6a927b111af270dc5 R14,R11 1206 2
7 a796b83a989746b6a927b111af270dc5 R13,R15,R12,R10 1206 4
8 a796b83a989746b6a927b111af270dc5 R21,R19 1206 2
9 a796b83a989746b6a927b111af270dc5 R20 1206 1
10 a796b83a989746b6a927b111af270dc5 R24,R22 1206 2
11 a796b83a989746b6a927b111af270dc5 R23 1206 1
12 7c4042779cea4abdf4b201e0d3ecfdb3 P1,P2,P3,P4,P5,P6,P7,P8 HDR-TH_4PIN-V-ROW2-COL2-MALE-PITCH2.54 8

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