Perrygraf PRD Electronics RF/Power Loss Calculator

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Country of manufacture: USA,            Date of manufacture: ____
Diameter: 15.4 cm,      Weight: 24,1 gms
Materials: cardboard disks, plastic cursor
Scales: specialty
Front (RF Calculator)
     Outer Disk: Power (Watts) Power (DBM)
     Inner Disk: Volts, Reference Impedance
     Cursor: 6 hairlines for 6 levels of SWR mismatch
Back (Power Loss Calculator)
     Outer Disk: db Down, % Power Loss
     Inner Disk: Load SWR, Generator SWR
     Cursor: one hairline
Condition: C3 (Very minimal signs of use; sticker affixed to back side with name of prior owner)
Came with: nothing

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