TM-V71 fan upgrade

This is a simple modification that takes around 5 minutes but makes a big improvement to the already great TM-V71. The fan on this radio is very loud and runs at full speed from the moment you press the PTT then stays on for a few minutes after you release the PTT. This isn’t a problem in a mobile setting where there is usually more background noise but it is very loud when using the TM-V71 in a quiet home shack.

Just a few basic tools are needed along with two small pieces of heat shrink and a good upgraded fan. I use the Noctua NF-A4x10 which is on the more expensive side of the fan world but it’s well worth every penny.

Just remove the top of the radio, remove the existing fan, cut off the connector and solder onto the red and black leads from the new fan. Put it back together and enjoy the silence!

8 Replies to “TM-V71 fan upgrade”

  1. I just did this mod to my new TM-V71 and it works great, much quieter now. Thanks!

  2. Matt,

    Thanks for pointing out the Noctua fan. I have 2 TM-V71As (base and mobile). The newer one developed a bearing-like noise just after the one-year warranty expired and it became even noisier, but Kenwood replaced it under warranty.

    Their fans are noisy regardless and I am considering your mod, but I am curious as to the CFM of the original vs Noctua fans. I don’t know the CFM of the original, but the Noctua runs around 4.83CFM (8.2m³/h). I suspect much of the noise difference may be due to design, but possibly some because of differing amounts of air moved. Did you happen to check that out?

  3. The original Kenwood one I removed was rated at 4.68CFM according to the label. I find the Noctua much better and far less noise! They are not the cheapest but well worth it in my opinion.

  4. Thanks Matt. Given that the Noctua fan moves slightly more air and produces less noise, I have ordered 3 of them, 1 for each of my 2 TM-V71s, and one to improve the final cooling on a uBITX I will be ‘assembling this coming fall (too busy with friend and family visiting during the summer).

  5. Hello Matt, I have purchased one of the last TM-V71 produced, with the original Nidec fan. I would like to install a Noctua. Seeing their site I noticed they have two 12v. models, the
    NF-A4x10 PWM : https://noctua.at/en/products/fan/nf-a4x10-pwm/specification
    and the
    NF-A4x10 FLX : https://noctua.at/en/products/fan/nf-a4x10-flx/specification
    Wich one do you think it’s the most appropriate?
    And, should I install the Low-Noise Adaptor (L.N.A.)?
    Thanks, Helder Maia, CT1EXJ

  6. No problem. It would be good if you can post back with your opinion of them. I have just changed the fan on another TM-D710 and a TM-D700. Both work great!

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