Fixed several broken links

content/blog/digitalmodes.md

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+---
+title: "Getting started with Digital Modes in Linux"
+date: 2019-09-04T09:52:21-04:00
+draft: false
+aliases:
+  - /blog/digialmodes
+tags: [ "Amateur Radio" ]
+---
+
+This blog post is going to describe what steps I took to be able to decode signals using digital modes. Hardware wise, you will either need a RTL-SDR receiver or a transceiver radio with a cable plugging into the computer's soundcard.
+
+## Software Required
+
+- Gqrx (depends on GNU Radio)
+
+  - This is if you are trying to work with RTL-SDR
+  - It acts as a AM/FM/CW/etc demodulator for the data sent by the equipment
+
+- Fldigi
+
+  - This is what decodes the protocol used to package the data
+  - It acts as a modem and provides capability to transmit data using a transceiver 
+
+- Pavucontrol
+
+  - This connects both Gqrx and Fldigi if using RTL-SDR
+
+As you can see, if you are only using a transceiver then you can skip the parts mentioning Gqrx and Pavucontrol
+
+## Process
+
+### Gqrx
+
+When you first open up Gqrx, it'll ask you to configure the device. I have the RTL2832U, so if you have the same tool...
+
+Select the profile partially labeled RTL2832U. If you want to look at frequencies between 0 and 28MHz then add to the device string "direct_samp=3". Otherwise don't add that string. 
+
+You can keep the rest of the settings the same.
+
+### Fldigi
+
+When you first open up Fldigi, it'll ask you for our operator info.
+
+| Field             | description                               |
+| ----------------- | ----------------------------------------- |
+| Station Callsign  | Your callsign                             |
+| Station QTH       | City, State                               |
+| Station Locator   | Your grid code. (Can look this up on QRZ) |
+| Operator Callsign | Your callsign                             |
+| Operator Name     | Your name                                 |
+| Antenna           | Your antenna type                         |
+
+In Audio->Devices, make sure you select the physical device if you're using a transceiver, otherwise select PulseAudio.
+
+You can keep the rest of the settings as the default.
+
+### Pavucontrol
+
+Finally to link the two, run the following lines in bash to create a sink in order to push the audio from Gqrx to Fldigi.
+
+```bash
+pacmd load-module module-null-sink sink_name=MyLoopback
+pacmd update-sink-proplist MyLoopback device.description=MyLoopback
+pacmd load-module module-loopback sink=MyLoopback
+```
+
+Now open up `pavucontrol`. On the Playback tab, change the output device of GQRX to be "MyLoopback"
+
+On the Recording tab, change the input of fldigi to "Monitor of Null Output"
+
+## Conclusion
+
+Now the software is sufficiently setup to be able to receive and decode signals. Best of luck finding things out there!
+
+## Beginner Pitfalls
+
+Since I'm also a beginner, I will share what I got stuck on and how you can avoid it.
+
+Make sure that you know the appropriate mode to demodulate the signal. I've had luck getting information from https://www.sigidwiki.com/wiki/Signal_Identification_Guide
+
+-> This needs to be configured on both Gqrx and Fldigi