Update readme.md

RFPA/readme.md

@@ -14,9 +14,49 @@ As a main component the broadband high power amplifier ZHL-20W-13SW+ (SN: RB8102
 
 ![8ch RFPA wiring diagram](./images/rfpa_wiring_diagram.png "Wiring diagram of 8-channel RFPA")
 
-Figure 2 - Wiring diagram of the 8-channel amplifier. The components used can be found in Table 1.
+**Figure 2** - Wiring diagram of the 8-channel amplifier. The components used can be found in Table 1.
 
 | Item No. | Component | Function | Est. cost per Pc. [€] | Amount | Total cost [€] | Source 1
 | ----- | -------- | -------- | ----- | ----- | ----- | --------|
 | 1     | SMA sockets    | RF input     | XX    | 8     | xx    | xx    |
 | 2     | BNC sockets    | Input external 5V TTL signal     | XX    | 1     | xx    | xx    |
+
+**Table 1** - Components used in RFPA build.
+
+
+![RFPA front view](./images/8-channel_braodbandRFPA_front.jpg "Front view of RFPA with annotations")
+
+**Figure 3** - Front view of RFPA with annotated components (see Table 1)
+
+![RFPA rear view](./images/8-channel_braodbandRFPA_rear.jpg "Rear view of RFPA with annotations")
+
+**Figure 4** - Rear view of RFPA with annotated components (see Table 1)
+
+![RFPA top view](./images/8-channel_braodbandRFPA_topview.jpg "Top view of RFPA without cover and annotations")
+
+**Figure 5** - Top view of the RFPA with the cover removed and annotated components (see Table 1)
+
+
+## Functionality
+
+Before switching on the PTX amplifier, the unit must be connected to the mains voltage (230 V / 50 Hz) at the C14 socket ⑦ and an input or output signal must be connected to the eight channels ① and ⑤Then the PTX amplifier can be switched on with the rocker switch ④. 
+The rocker switch ③ can be used to select between internal manual unblanking (rocker switch right, ON) and blanking by an external TTL signal (rocker switch left, TTL). A 5 V TTL signal can be connected to the BNC socket ②. Unblanking is necessary to unlock the amplifier modules. 
+
+## Functional tests
+
+### Test of the supply current
+By measuring the supply current I_SC, the general function of the individual amplifiers (High Power Amplifier ZHL-20W-13SW+) is to be tested. For this purpose, a multimeter (VOLTCRAFT MT-51, SN: 09126841) was inserted into the current path of the supply current I_SC. According to the amplifier's data sheet, the supply current I_SC is max. 2.8 A during proper operation (with fan). The values measured (Table 2) are within the tolerances.
+
+(table 2 here)
+
+### Testing of electrical safety
+
+The electrical safety test was carried out in accordance with DIN 0701 0702. 
+
+### Power measurement
+
+The power measurement is intended to test the general function of the PTX amplifier. For the test setup, an attenuator (inventory no.: 98041129), an oscilloscope (inventory no.: 200052853/1) and a signal generator (inventory no.: 97037910) were used as displayed in Figure 6. The attenuator has an attenuation factor of -30 dB. The measured results are displayed in Table 3.
+
+
+
+