diff --git a/pages/02.part-1/03.physical-layer/docs.md b/pages/02.part-1/03.physical-layer/docs.md
index 33e3da1..b7e8a42 100644
--- a/pages/02.part-1/03.physical-layer/docs.md
+++ b/pages/02.part-1/03.physical-layer/docs.md
@@ -12,13 +12,16 @@ media_order:
 
 M17 standard uses 4FSK running at 4800 symbols/s (9600
 bits/s) with a deviation index h=0.33 for transmission in 9 kHz
-channel bandwidth. Channel spacing is 12.5 kHz. The symbol stream is
-converted (upsampled) to a series of impulses which pass through a
+channel bandwidth. Channel spacing is 12.5 kHz. 
+
+The symbol stream is converted (upsampled) to a series of impulses which pass through a
 root-raised-cosine (alpha=0.5) shaping filter before frequency modulation
 at the transmitter and again after frequency demodulation at the
 receiver.
 
-!!! Do we need to specify minimal/recommended upsampling rates and minimal/recommended number of RRC taps? !!!
+Upsampling by a factor of 10 is recommended (48000 samples/s).
+
+The root-raised-cosine filter should span at least 8 symbols (80 samples, 81 taps).
 
 [mermaid]
 graph LR
@@ -81,6 +84,8 @@ In the case of dibits, the most significant bit is sent first. When four dibits
 
 A complete transmission shall consist of a preamble, a synchronization burst, data, and an end of transmission marker.
 
+![physical_layer_transmission](phy_layer.svg?classes=caption "Physical Layer Transmission")
+
 ### Preamble
 
 Every transmission shall start with a preamble, which shall consist of 40 ms (192 symbols) of alternating outer symbols (+3, -3) or (-3, +3). To ensure a zero crossing prior to a synchronization burst, the last symbol transmitted within the preamble shall be opposite the first symbol transmitted in the synchronization burst.
diff --git a/pages/02.part-1/03.physical-layer/phy_layer.svg b/pages/02.part-1/03.physical-layer/phy_layer.svg
new file mode 100644
index 0000000..5d377db
--- /dev/null
+++ b/pages/02.part-1/03.physical-layer/phy_layer.svg
@@ -0,0 +1,26 @@
+<?xml version="1.0" encoding="utf-8"?>
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+<text transform="matrix(1 0 0 1 134.6441 34.13)" class="st1 st2">SYNC BURST</text>
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+<text transform="matrix(1 0 0 1 435.4617 34.13)" class="st1 st2">EOT</text>
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+<text transform="matrix(1 0 0 1 57.1884 59.7264)"><tspan x="0" y="0" class="st3 st4">40ms</tspan><tspan x="-21.7" y="14.4" class="st3 st4">(192 Symbols)</tspan></text>
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+</svg>