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70095Re: [softrock40] Re: What's the most TX power anyone has amplified an RXTX to? Just out of curiosity...

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  • Sid Boyce
    Nov 16, 2012
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      On 16/11/12 14:40, Chris Wilson wrote:
      >> ----- Original Message -----
      >> Subject: [softrock40] Re: What's the most TX power anyone has
      >> amplified an RXTX to? Just out of curiosity...
      >> Another related question may be "What is the largest spurious
      >> signal transmitted from a Softrock, (or other SDR)."
      >> On WSPR "Chat" the other day I came across someone who was
      >> transmitting without having checked his TX IQ was correct. Transmitting
      >> on the wrong frequency.
      >> He also knew nothing about setting TX IQ balance so when the IQ was
      >> set correctly his image may have been only 25dB down.
      >> If he had a fault he could have been transmitting simultaneously on
      >> both frequencies without knowing. The same as "mirrored"
      >> receiving.
      >> A good understanding of what is involved is necessary before
      >> amplifying mistakes. Any soundcard SDR transmitter needs careful
      >> setting by someone who at least understands the basics. A receiver must be used to check.
      >> I sometimes wonder when immediately after building a Softrock
      >> somebody says "I want more power". It took me quite a while to get a
      >> fair understanding of the Softrock and software.
      >> 73 Alan G4ZFQ
      > 16/11/2012 14:36
      > As I said, I was just curious as to how much power people
      > realistically run from these things, and my thoughts were whether they
      > could be made clean enough to be unobtrusive at high power output
      > levels, or whether the fact the majority are QRP tends to hide any
      > nasties from the fellow spectrum users. Is a soundcard based SDR TX
      > bound to be dirtier than a good conventional transmitter? Or can the
      > Softrock RXTX package be amplified to serious levels without becoming
      > unsociable, and without major doctoring?
      I know people are using the SDR-CUBE (a SR v6.3 with smarts) with 50W
      and more.
      73 ... Sid.

      Sid Boyce ... Hamradio License G3VBV, Licensed Private Pilot
      Emeritus IBM/Amdahl Mainframes and Sun/Fujitsu Servers Tech Support
      Senior Staff Specialist, Cricket Coach
      Microsoft Windows Free Zone - Linux used for all Computing Tasks
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