Tokyo HL-35V 144MHz Amplifier for SOTA

I recently purchased a second-hand Tokyo 144 MHz 35 watt FM mode amplifier through a VK3 private sale.  The amplifier will make a nice addition to compliment my QRP SOTA rig Yaesu FT-817 on 2m.  Input to the amplifier will be via a short length of coax from the FT-817 front BNC socket.

Tested the amplifier with a low power carrier input on FM and CW.  The amplifier operates as expected, all switches and relays have an audible presence.

If anyone reading this post has a manual/circuit diagram for the HL-35V amplifier I’m looking for a copy  😉     Tokyo dropped its internet presence sometime ago, meaning User Manuals are not freely available online. 😧👎

15 June 2016 update.  Special thanks to John in Port Macquarie for a copy of the Digitor D-2510 user manual and circuit diagram, which is known by some to be the same as the HL-35V. 😉

Tokyo Hy-Power HL-35V amplifier specifications:

  • Frequency range 144 -148 MHz
  • Power supply: DC 13.8V
  • Max power consumption: 4.5A
  • RF Input: 0.5 – 5 W
  • RF Output: 16 – 35 W
  • RX pre-amp gain: 20db
  • Dimensions: (W*H*D) 100*40*150 mm
Tokyo HL-35V 2m All mode 35 watt amplifier

Tokyo HL-35V 2m FM-mode 35 watt amplifier

Yaesu FT-817 and Tokyo HL-35 2m amplifier

Yaesu FT-817 and its 2m companion Tokyo HL-35V 2m amplifier

Tokyo HL-35V rear panel

Rear panel

Rear panel connectors and power cable

Last update: 27 January 2017



8 thoughts on “Tokyo HL-35V 144MHz Amplifier for SOTA

  1. Hi Andrew. As you probably have seen, I have the Digitor Amp as sold by DSE. I purchased it around 1997. It has an internal switch to select either SSB or FM, providing some relay latency in the SSB & CW modes. 1 watt in gives 35 watts out. I have been running the KX3 on the internal batteries and using the LiFe battery to power the amplifier. Only issue that I have ever had was the internal cabling from the SO-239 connectors and the circuit board. When connected in the shack using RG-213 connectors in a fixed position, some stress was placed on the back panel causing the solder connection to the SO-239 to crack. This should not be an issue with the light weight SOTA installation.
    Enjoy reading of your exploits, Tony

      • It turns out that mine was an HL37V and the rx amplifier is kaput, so when connected this amplifier makes me into the ultimate alligator. All mouth and no ears. Increases tx output to over 30w very nicely, but reduces the receiver sensitivity to people in the next street. I must fix it (have a backlog of fixable gear). 73 Andrew VK1DA/VK2UH

  2. Hi Andrew
    It looks good. I envy you guys able to use two metres from Peaks. The Adelaide Hills are just two difficult for this band as anyone who has tried from Mount Lofty will know. The RF soup is thick! Other hills are too far back from the Adelaide plains for a line of sight path. Even for the high power broadcasters reception close into the hills is really patchy. Thus there are relay transmitters in the city firing back into the foothills.
    Good luck and I will watch with interest.

    John D

  3. Hi Andrew Digitor D-2510 is the same amp made by Tokyo Manual is available at

    Cheers Rod

    Sent from my iPhone


  4. ill see if I can find a manual, you might be better with the circuit diagram!

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