Alinco DX-70TH (DX 70 TH DX70TH) transceiver: TX and RX MOD

   
 
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25 September 2021, 4:52 UTC 


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Alinco DX-70TH (DX 70 TH DX70TH)
Alinco DX-70TH
Programming interface schematics for Alinco :
Programming software for Alinco DX-70TH (DX 70 TH DX70TH) :
PDF User Manual for Alinco DX-70TH (DX 70 TH DX70TH) :
PDF Dealer's Manual for Alinco DX-70TH (DX 70 TH DX70TH) :
PDF Service Manual for Alinco DX-70TH (DX 70 TH DX70TH) :
Schematics for Alinco DX-70TH (DX 70 TH DX70TH) :

Mods for Alinco DX-70TH (DX 70 TH DX70TH):
   Alinco DX-70TH (DX 70 TH DX70TH) Noise Blanker Modification
   Alinco DX-70TH (DX 70 TH DX70TH) 45 - 60 MHz
   Alinco DX-70TH (DX 70 TH DX70TH) More talk power on SSB
   Alinco DX-70TH (DX 70 TH DX70TH) TX and RX MOD

Alinco DX-70TH (DX 70 TH DX70TH) technical specifications :  Alinco DX-70TH (DX 70 TH DX70TH) technical specifications



Alinco DX-70TH (DX 70 TH DX70TH) TX and RX MOD

Extended TX, open the RX up to 35Mhz and down to 30 Khz, Open the VHF side from 45-60 Mhz RX/TX. All can be done quickly by , by removing or changing a series of chip-resistors located in the detatchable front face panel. This mod is a little tricky to perform, since it uses surface mount devices, so I TAKE NO RESPONSIBILITY IF YOU BREAK YOUR RIG.

Alinco, further, in their mod sheet, warns that performing this mod incorrectly will NOT BE COVERED via warranty. At first, I tried using a Salami sized soldering iron--- take my word, get a good, very fine point iron of about 15 or 20 watts max! Make sure it is static guarded too.

Ok...Here we go.

  1. disconnect power

  2. disconnect antenna

  3. remove control head, disconnect control cable

  4. remove 4 screws on back of control head,

  5. remove (unsnap is more like it) the control head back panel.

  6. THE MOD:

    Once you have the back panel removed, and using the big VFO knob as your guide (circuit board facing you, LCD display not facing you). The VFO knob should be on the left side. On the right side, in the lower right hand corner, you should see 2 distinct columns of chip resistors.
    On the board, they are NOT labeled, but I will draw the diagram below to help you. You cant miss these because there are 5 chip resistors in the left-hand row, and the right-hand row has 7 chip resistors. Above both rows is a solder-pad.



    Click to enlarge the picture.

    Several chip resistors will be soldered in, depending on the model of your rig, and a solder pad is jumpered. Here are the mods per Alinco:

    1. HF RX down to 30 Khz - remove the jumper m
    2. beyond just Mars Mod - TX/RX everywhere remove both jumpers c and e
    3. HF RX up to 35 MHZ - solder a bridge across pad a

    After performing the above mods, reassemble the unit.

  7. DONT FORGET to reset the microprocessor (with the radio off, hold the F button and simultaneously turn the power on. All memories are wiped out, but the new bands are opened.

I've tried all mods with my Alinco rig and can confirm they work. I am able to pick up business band communication in the 46 Mhz range (FM), and cordless phones in 46/49 range. It TX's everywhere now too.

I do not take responsibility if you perform this mod incorrectly, and I am not responsible for your operation practice if you choose to illegally transmit out of band.


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