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SB-220 high swr on 10 meter

Discussion in 'General Technical Questions and Answers' started by KC9JYW, Jun 15, 2019.

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  1. KC9JYW

    KC9JYW Ham Member QRZ Page

    80-15 has great swr with amp on but 10m is high above 2.0 Running an ft-991 with dummy load and auto tune before turning amp on. Could the problem be the 10m coil needing adjustment? Thoughts???
  2. WB2WIK

    WB2WIK Premium Subscriber QRZ Page

    Sure, you can adjust it but with an SB-220 that's not the easiest thing; the designers did not make provision for tuning the input coils from outside the amp.

    Be careful.
    KA9JLM likes this.
  3. KA9JLM

    KA9JLM Ham Member QRZ Page

    Seems the radio would tune 2:1 on the input of the amp no problem.

    Shooting for perfect on all frequencies can be hard.
  4. KC9JYW

    KC9JYW Ham Member QRZ Page

    80-15 is giving me about 1000w with 1:3 being the highest swr to where 10 is giving me 200w and 2.5 or so. I would think a higher swr and lower wattage is normal on 10m but this seems a bit too much.
  5. WB2WIK

    WB2WIK Premium Subscriber QRZ Page

    You can re-tune the input, just be careful since you have to do this "inside" the amp.

    The SB-220 always provided a bit less power on 10m (compared to lower bands), but should be a lot more than 200W.

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