Loading ...
Sorry, an error occurred while loading the content.
 

PA matching

Expand Messages
  • Pascal
    Hi I have just finished to build a PA2008 10W amplifier from QRPproject (kit by DK1HE) to amplify the 6.3 TX/RX output - This PA needs only 10 mW INPUT , so I
    Message 1 of 5 , Feb 28, 2010
      Hi
      I have just finished to build a PA2008 10W amplifier from QRPproject (kit by DK1HE) to amplify the 6.3 TX/RX output - This PA needs only 10 mW INPUT , so I don't need the full power of the usual TX/PA module - My idea is to build only a part of one TX/RX module ending with the 2N2222 as a driver for the 10MW PA, without filter, as I have also added an switchable LP filter (another kit by HFproject K5OOR)- Can any specialist confirm the 2N2222 will give the 10mW and suggest how to wire the T201 transformer in order to get a broadband module ? Thanks for yr help
    • Pascal
      Hi I have just finished to build a PA2008 10W amplifier from QRPproject (kit by DK1HE) to amplify the 6.3 TX/RX output - This PA needs only 10 mW INPUT , so I
      Message 2 of 5 , Feb 28, 2010
        Hi
        I have just finished to build a PA2008 10W amplifier from QRPproject (kit by DK1HE) to amplify the 6.3 TX/RX output - This PA needs only 10 mW INPUT , so I don't need the full power of the usual TX/PA module - My idea is to build only a part of one TX/RX module ending with the 2N2222 as a driver for the 10MW PA, without filter, as I have also added an switchable LP filter (another kit by HFproject K5OOR)- Can any specialist confirm the 2N2222 will give the 10mW and suggest how to wire the T201 transformer in order to get a broadband module ? Thanks for yr help
      • Brent G DeWitt
        Hi Pascal, My suggestion would be to simply build a resistive 50 ohm 20 dB attenuator (3 resistors) to go between the standard SoftRock and the PA2008 amp.
        Message 3 of 5 , Feb 28, 2010

          Hi Pascal,

           

          My suggestion would be to simply build a resistive 50 ohm 20 dB attenuator (3 resistors) to go between the standard SoftRock and the PA2008 amp.  That way you have a perfectly useful SoftRock when you don’t want to use/carry the amp.  I can give you the resistor values you need if you want to go this way.

           

          73,

           

          Brent – AB1LF

           

          From: softrock40@yahoogroups.com [mailto:softrock40@yahoogroups.com] On Behalf Of Pascal
          Sent: Sunday, February 28, 2010 4:20 PM
          To: softrock40@yahoogroups.com
          Subject: [softrock40] PA matching

           

           



          Hi
          I have just finished to build a PA2008 10W amplifier from QRPproject (kit by DK1HE) to amplify the 6.3 TX/RX output - This PA needs only 10 mW INPUT , so I don't need the full power of the usual TX/PA module - My idea is to build only a part of one TX/RX module ending with the 2N2222 as a driver for the 10MW PA, without filter, as I have also added an switchable LP filter (another kit by HFproject K5OOR)- Can any specialist confirm the 2N2222 will give the 10mW and suggest how to wire the T201 transformer in order to get a broadband module ? Thanks for yr help

        • uli
          Hi, I have SoftRock V6.2 (40/30m) with QRPproject PA. You can find a schematic, how to connect this PA to the SoftRock here:
          Message 4 of 5 , Mar 1, 2010
            Hi,

            I have SoftRock V6.2 (40/30m) with QRPproject PA.
            You can find a schematic, how to connect this PA to the SoftRock here:
            http://dj9cs.raisdorf.org/SDR-SoftRock-07.html .Schematic with red line
            at the end of the site (most in german language).
            T2 is 2x4 turns bifilar.

            Have success

            73
            Uli
            DF5SF


            >
            > Hi
            > I have just finished to build a PA2008 10W amplifier from QRPproject (kit by DK1HE) to amplify the 6.3 TX/RX output - This PA needs only 10 mW INPUT , so I don't need the full power of the usual TX/PA module - My idea is to build only a part of one TX/RX module ending with the 2N2222 as a driver for the 10MW PA, without filter, as I have also added an switchable LP filter (another kit by HFproject K5OOR)- Can any specialist confirm the 2N2222 will give the 10mW and suggest how to wire the T201 transformer in order to get a broadband module ? Thanks for yr help
            >
            >
            >
            > ------------------------------------
            >
            > Yahoo! Groups Links
            >
            >
            >
          • Pascal
            Hi Uli, Thanks for the link - I will try this way, it seems simple and without risk 73
            Message 5 of 5 , Mar 1, 2010
              Hi Uli,
              Thanks for the link - I will try this way, it seems simple and without risk

              73

              --- In softrock40@yahoogroups.com, uli <uli@...> wrote:
              >
              > Hi,
              >
              > I have SoftRock V6.2 (40/30m) with QRPproject PA.
              > You can find a schematic, how to connect this PA to the SoftRock here:
              > http://dj9cs.raisdorf.org/SDR-SoftRock-07.html .Schematic with red line
              > at the end of the site (most in german language).
              > T2 is 2x4 turns bifilar.
              >
              > Have success
              >
              > 73
              > Uli
              > DF5SF
              >
              >
              > >
              > > Hi
              > > I have just finished to build a PA2008 10W amplifier from QRPproject (kit by DK1HE) to amplify the 6.3 TX/RX output - This PA needs only 10 mW INPUT , so I don't need the full power of the usual TX/PA module - My idea is to build only a part of one TX/RX module ending with the 2N2222 as a driver for the 10MW PA, without filter, as I have also added an switchable LP filter (another kit by HFproject K5OOR)- Can any specialist confirm the 2N2222 will give the 10mW and suggest how to wire the T201 transformer in order to get a broadband module ? Thanks for yr help
              > >
              > >
              > >
              > > ------------------------------------
              > >
              > > Yahoo! Groups Links
              > >
              > >
              > >
              >
            Your message has been successfully submitted and would be delivered to recipients shortly.