$12 Ham Radio Power Supply

Discussion in 'Amateur Radio News' started by KB1THM, Apr 26, 2020.

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  1. K5SEU

    K5SEU Ham Member QRZ Page

    So i modded the HSTNS-PL18 as per outline of ON5VL. Voltage set to 13.8V and seemed to work fine.. until I put my HF radio on it and it shuts off at around 40watts. First I thought that RF was getting into the PS but that doesn’t seem to be the issue. Rather it seems to be the load in the PS that’s causing it. Any thoughts?? Put a lot of work into it and would love to see it work. Steps I followed as per the link. Tks!!

  2. K2DJ

    K2DJ Ham Member QRZ Page

    Try to lower the output voltage a little.
  3. K5SEU

    K5SEU Ham Member QRZ Page

    Thanks! That did the trick and power stays on now when running at 100w.

    On SSB I do get issues with some „ratteling“ sound in the PS. I have tested and it doesn’t seem to be RFI. It might have something to do with the variation in draw from the SSB modulation? No issues with other modes.
  4. KC2KOJ

    KC2KOJ Ham Member QRZ Page

    check this out disable over volt protection and set output voltage
  5. KC2KOJ

    KC2KOJ Ham Member QRZ Page

    if you add some capacitors to the output that will go away
  6. KC2KOJ

    KC2KOJ Ham Member QRZ Page

  7. KC2KOJ

    KC2KOJ Ham Member QRZ Page

    try 10000uF 16V Radial Capacitors
    Last edited: May 16, 2020
  8. KC2KOJ

    KC2KOJ Ham Member QRZ Page

  9. K5SEU

    K5SEU Ham Member QRZ Page

    Thanks! Lots of good tips here.

    I will give this a try. I found out that if I adjust the voltage down to 13.4V the effect of SSB as described above is greatly reduced, although still present.
  10. AE6XO

    AE6XO Ham Member QRZ Page

    I just bought one of these HP supplies and tried it out. There is RF interference visible on my Flex-6300 spectrum display on 80, 40, 20, 15, and 10 meters. There are a few RF spikes visible on each band when the power supply is under load operating a VHF radio that is on transmit. Has anyone else noticed this? Would a metal enclosure help here?

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