Added instructions on rotary encoder replacement for the H2, added technical details about the encoder type to facilitate finding replacement parts

Encoder.md

@@ -1,17 +1,52 @@
 > [!NOTE]  
 > This section is mostly talking about H2
 
-Encoder for H2/H2+ uses a [30-step EC11 encoder](https://www.aliexpress.com/i/1005002905424756.html) with push button.
+Encoder for H2/H2+ uses a [30-step EC11 encoder](https://www.aliexpress.com/i/1005002905424756.html) with push button and shaft length of 12.5mm.
 
 A short press of the push button turns on the PortaPack; a long press or two short presses turns off the PortaPack.  If no click is felt when the knob is pressed, there may be insufficient clearance between the knob and the case, in which case some padding may be added inside the knob shaft.
 
 A malfunctioning rotary encoder may sometimes work better if the knob is pressed slightly to the left when rotating.  Make sure that the Portapack is running firmware version 1.7.1. or later, which improves handling of glitchy switch contacts.  Encoder dial sensitivity can also be modified in Settings.
 
-To replace a defective rotary encoder without damaging the PortaPack PCB traces, consider snipping the 5 contact leads before desoldering them.  Then heat one of the two ground lugs at a time while gently pressing the encoder away from the ground lug being heated.
-
 ## Plastic knob
 
 Depending on the shaft of your encoder, you can use [diverse knobs](https://www.aliexpress.com/item/1652540985.html):
 
 ![image](https://github.com/user-attachments/assets/cd117b4e-ba62-4515-8b44-4b492b917e67)
 
+## Encoder Replacement for PortaPack H2
+
+### Disassembly
+To replace the encoder, you'll first need to disassemble the PortaPack. 
+
+1. Unscrew the four screws holding the top plate.
+2. Unscrew the four screws securing the bottom plate.
+3. Unscrew the SMA connector rings on both plates.
+4. Pull apart the case and carefully separate the PortaPack from the HackRF by gently pulling upwards to disconnect the pins.
+5. Once the PortaPack is free, flip it around and locate the speaker and battery connectors.
+> [!WARNING]  
+> Mark or take note of which connector is for the speaker and which is for the battery to avoid confusion and possible damage during reassembly.
+6. Unplug both connectors, and set the the rest aside.
+
+### Removing the Defective Encoder
+
+The encoder is mounted in a way that makes it difficult to desolder due to pin placement. If you are having trouble with this, try the following technique:
+
+1. Use a pair of tin snips to cut the encoder’s leads and remove the encoder.
+2. Apply flux to the solder pads.
+3. Carefully heat each pad with a soldering iron, one by one, to remove the clipped leads. This approach reduces strain on the pads and lowers the risk of tearing up the traces.
+> [!WARNING]  
+> The upper-most pin is close to the screen, take care not to scorch it with your soldering iron.
+
+### Preparing and Installing the Replacement Encoder
+
+The replacement rotary encoder will likely have long leads designed for through-hole mounting. However, the PortaPack uses surface mounting for this component, so the leads will need to be trimmed down. Here’s how to do it:
+> [!NOTE]  
+> Correct lead length is important to avoid clearance issues when reassembling the case.
+
+1. **Trim the Leads:** Shorten the encoder leads so that they are approximately flush with the body of the encoder. This will ensure that the encoder sits stably and doesn’t increase the height of the assembly.
+2. After trimming, solder the encoder on the PCB, taking care to align it correctly before soldering.
+3. After soldering each pin, do a visual inspection to ensure there is good electrical contact.
+
+### Reassembly
+
+Once the new encoder is in place, follow the disassembly steps in reverse to reassemble your PortaPack.