Kenwood TH-D74A - Revision history

Linux4life798: Add suspected IO-Expander chip

2026-05-05T21:48:53Z

Add suspected IO-Expander chip

2020-10-22T03:04:28Z

2020-09-28T18:31:14Z

2020-09-28T18:30:42Z

2020-09-28T18:29:09Z

2020-09-28T18:16:13Z

Undo revision 963 by Hash (talk)

2020-09-28T18:13:57Z

2020-09-07T00:34:18Z

Datasheets

2020-09-07T00:33:39Z

Understand how the radio works

2020-09-07T00:31:38Z

References

@@ Line 157: / Line 157: @@
 |`0
 |}
 ==Datasheets==
 [https://wiki.recessim.com/w/images/5/5d/Kenwood_TH-D74A_Datasheet_-_IC-701_-_DRAM.pdf Kenwood TH-D74A Datasheet - IC-701 - DRAM]
@@ Line 167: / Line 169: @@
 [https://wiki.recessim.com/w/images/c/cd/IC-707_-_Not_exact_match_but_same_family_-_WM8940_v4.3.pdf IC-707 - Not exact match but same family - WM8940]
 <br /><references />

← Older revision		Revision as of 03:04, 22 October 2020
Line 1:		Line 1:
−	[[File:TH-D74A.jpg~~\|none~~\|thumb\|Fully Assembled Kenwood TH-D74A]]	+	[[File:TH-D74A.jpg\|thumb\|Fully Assembled Kenwood TH-D74A\|alt=]]Full teardown pictures and videos of the TH-D74 along with notes on reverse engineering and obtaining a copy of the firmware.

	==Teardown Video==		==Teardown Video==

@@ Line 1: / Line 1: @@
 [[File:TH-D74A.jpg|none|thumb|Fully Assembled Kenwood TH-D74A]]
 ==Teardown Video==
 minute video @ 3x playback speed showing full disassembly of the radio with commentary, full length video with no audio [https://youtu.be/Q_n_bs6f8gE here].

@@ Line 3: / Line 3: @@
 File:Kenwood_TH-D74_and_JTAGulator.jpg|
-rect 712 169 925 329 [[|Screen]]
+rect 712 169 925 329 [[Kenwood_TH-D74A|Screen]]
 desc bottom-left

@@ Line 1: / Line 1: @@
 [[File:TH-D74A.jpg|none|thumb|Fully Assembled Kenwood TH-D74A]]
 ==Teardown Video==
 minute video @ 3x playback speed showing full disassembly of the radio with commentary, full length video with no audio [https://youtu.be/Q_n_bs6f8gE here].

@@ Line 100: / Line 100: @@
 ====Understand how the radio works====
-There is a serial port<ref>Test citation to see if References header is automatically added.</ref> labeled SCTX and SCRX (See Processor Board Bottom picture above), both of these lines appear to be transmit only from the top CPU board down to the bottom transceiver board. As the radio is tuned from one frequency to another the SCRX line has a lot of activity, when the transmitter is keyed up the SCTX line has activity. Below is a sample of what is seen on the SCRX line. [[Travis Goodspeed]] commented to me on Twitter that these commands seemed similar to the Rig Control commands sent from PC's to radio's to control them.
+There is a serial port labeled SCTX and SCRX (See Processor Board Bottom picture above), both of these lines appear to be transmit only from the top CPU board down to the bottom transceiver board. As the radio is tuned from one frequency to another the SCRX line has a lot of activity, when the transmitter is keyed up the SCTX line has activity. Below is a sample of what is seen on the SCRX line. [[Travis Goodspeed]] commented to me on Twitter that these commands seemed similar to the Rig Control commands sent from PC's to radio's to control them.
 {| class="wikitable mw-collapsible mw-collapsed"
 !SCRX

← Older revision		Revision as of 00:31, 7 September 2020
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	[https://wiki.recessim.com/w/images/c/cd/IC-707_-_Not_exact_match_but_same_family_-_WM8940_v4.3.pdf IC-707 - Not exact match but same family - WM8940]		[https://wiki.recessim.com/w/images/c/cd/IC-707_-_Not_exact_match_but_same_family_-_WM8940_v4.3.pdf IC-707 - Not exact match but same family - WM8940]
−	<br />	+	<br /><references />
−
−	~~==References==~~
−	<references />