diff --git a/RFPA/readme.md b/RFPA/readme.md
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--- a/RFPA/readme.md
+++ b/RFPA/readme.md
@@ -10,4 +10,4 @@ Figure 1 - Photograph of an assembled 8-channel RFPA
 The parallel transmission (pTx) RF amplifier is used to separately control the amplitude and phase of eight transmission channels for pTx experiments. 
 
 ## System design
-As a main component the broadband high power amplifier ZHL-20W-13SW+ (SN: RB81028153) was used to amplify the signals of the eight channels. The maximum input power for each channel is - 3 dBm (see also the data sheet [ZHL-20W-13SW+]()). A wiring diagram of the PTX amplifier can be found in the appendix of this documentation. Further components and operating elements can be found in the following Table 1 or in Figures 2 - 4.
+As a main component the broadband high power amplifier ZHL-20W-13SW+ (SN: RB81028153) was used to amplify the signals of the eight channels. The maximum input power for each channel is - 3 dBm (see also the data sheet [ZHL-20W-13SW+](./datasheets/Amplifier_Datasheet_ZHL-20W-13SW+.pdf)). A wiring diagram of the PTX amplifier can be found in the appendix of this documentation. Further components and operating elements can be found in the following Table 1 or in Figures 2 - 4.