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Re: [softrock40] Re: Configuring SR RXTX6.2 15/17M for 17/20M instead - suggestion?

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  • k5nwa
    ... I would invite you to create a blog on my site and document your whole experience so others can benefit from it. You can also add pictures in.
    Message 1 of 3 , Dec 2, 2007
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      At 01:46 PM 12/2/2007, you wrote:

      > > Looking for suggestion - I'd like to build 15/17M SR RXTX6.2 for use
      >on 17/20M instead, to complement the SR RXTX6.1 I built for 30/40M
      >(goal is these two boards in a box with Si570 oscillator).
      >
      >Hi Dave,
      >
      >I thought about it but went with the 40/80M, 20/30M, and 17/15M kits
      >instead. I am also planning on getting the 12/10M when it is
      >available. What I have done is to box two RXTX units together and
      >have relay switching for the audio (out to computer only) and RF coax.
      >If you look in the photo section under my call, KF4BQ you can see the
      >dual RXTX box (four bands) on the lower left side of my circuit
      >projects pict.
      >
      >The box has single computer inputs/outputs and single RF connector.
      >The power switch pick which unit to power and drives the relays for
      >switching audio output and RF coax. I didn't switch the audio input
      >(from the computer) since the lower impedance and higher drive of the
      >audio card can drive two softrock inputs without switching. Keyline
      >controls were also paralleled.
      >
      >I plan on doing this again to fit the 17/15M and 12/10M kits. Then I
      >will have two boxes covering 80-10meters. As shown in the picture
      >each of my RXTX daughter boards are mounted 90deg so I can piggyback
      >another daughter board giving me 4 freqs/board. I haven't finished
      >yet because I'm hoping on using a WB6DHW Si570 board instead of the
      >piggybacked boards to drive the crystal inputs instead. You can see
      >one on the completed (except waiting for the SI570) boards in the photo.
      >
      >I haven't done the filtering changes, but with the freq ratios being
      >close I'm sure you could. I did do some filter redesign of my Power
      >Mosfet amplifier changing the filter design from 160M, 80M, 40M, 30M,
      >20/17M, 15/12/10M grouping to: 160M, 80M, 40M, 30/20M, 17/15M, 12/10M
      >groupings. This fit my Softrock RXTX configuration better (just the
      >opposite for you). You can read about the details in the files
      >section under my call (KF4BQ and HF amp modifications).
      >
      >73's Mike Collins KF4BQ
      >

      I would invite you to create a blog on my site and document your
      whole experience so others can benefit from it. You can also add pictures in.

      < http://www.softrockradio.org/ >

      Thanks


      Cecil
      K5NWA
      www.softrockradio.org www.qrpradio.com

      "Blessed are the cracked, for they shall let in the light."
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