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Adding 70MHz (4m) Allocation To Flex PowerSDR

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I had a question about how to ‘remove’ the “Out Of Band” message you see in PowerSDR when using it with a transverter on 4m.  Natively Flex do not have the 4m allocation in their .XML config file so PowerSDR reports any frequency in 70.xMHz as “Out Of Band”.   The fix is easy and requires modifying the .XML file to add 4m band plan definitions.

The XML is located in the folder;

Windows 7 C:\Users\<username>\AppData\Roaming\FlexRadio Systems\PowerSDR <version>
WinXP C:\Documents and Settings\<username>\Application Data\FlexRadio Systems\PowerSDR <version>

I’ve added the text below into my XML, from line 1197 (but yours may be different), i.e. between the 6m band info and the 2m band info sections.


<BandText>
    <Low>70</Low>
    <High>70.05</High>
    <Name>Propagation Beacons</Name>
    <TX>true</TX>
  </BandText>
  <BandText>
    <Low>70.051</Low>
    <High>70.149</High>
    <Name>Narrow Band modes</Name>
    <TX>true</TX>
  </BandText>
  <BandText>
    <Low>70.15</Low>
    <High>70.15</High>
    <Name>MS Calling</Name>
    <TX>true</TX>
  </BandText>
  <BandText>
    <Low>70.151</Low>
    <High>70.199</High>
    <Name>Narrow Band modes</Name>
    <TX>true</TX>
  </BandText>
  <BandText>
    <Low>70.2</Low>
    <High>70.2</High>
    <Name>SSB/CQ Calling</Name>
    <TX>true</TX>
  </BandText>
  <BandText>
    <Low>70.201</Low>
    <High>70.259</High>
    <Name>All Modes</Name>
    <TX>true</TX>
  </BandText>
  <BandText>
    <Low>70.26</Low>
    <High>70.26</High>
    <Name>FM/AM Calling</Name>
    <TX>true</TX>
  </BandText>
  <BandText>
    <Low>70.261</Low>
    <High>70.294</High>
    <Name>All Modes</Name>
    <TX>true</TX>
  </BandText>
  <BandText>
    <Low>70.295</Low>
    <High>70.5</High>
    <Name>Channelised</Name>
    <TX>true</TX>
  </BandText>



After adding this then you get the correct band segment displayed in PowerSDR.

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This guide could obviously be applied to any other band you wish to add to PowerSDR.

One Comment

  1. Tony _ G3OVH says:

    DId you get it to transmit with this – I added a similar 4m section on my system driving a UHFSDR using Christos’s PowerSDR V2.4.4 for home made rigs version, but I havnt worked out how to get it to transmit. Something is inhibiting Tx with an error message such as “The frequency 70.200000MHz in combination with your TX filter settings [200,3100] are not within the Band specifications for your region (0).”

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