Message-ID: <4FA56D4F.4040304@xs4all.nl>
Date: Sat, 05 May 2012 20:11:27 +0200
From: Albert <westberg@xs4all.nl>
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To: rsgb_lf_group@blacksheep.org
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Subject: Re: LF: Flex 3000 sdr radio
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Op 5-5-2012 19:22, mal hamilton schreef:
> MF/LF
> First observations indicate that the radio is a good performer on HF 
> with appropriate antennas but on MF/LF with large antenna arrays there 
> is cross modulation and overload. This could be overcome with a 
> stepped ext attenuator or using smaller antennas on receive.
> Some other radios that I havd tried are useless on LF/MF with small 
> antennas but very good with large antenna arrays.
> 73 de mal/g3kev
Mal,

FlexRadio info, valid for Flex 5K and 3 K (Flex 1k5 below 500 kHz)

*Note 7: Customer provided pre-selector or appropriate low pass 
filter(s) required to eliminate images when used below 1.8 MHz*

For a good performance of your SDR you need a band pass filter for 136 
kHz and 500 kHz, an attenuator is not enough to get rid of all the ghost 
signals that show up on and around these bands.

Albert





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    Op 5-5-2012 19:22, mal hamilton schreef:
    <blockquote cite="mid:004e01cd2ae3$9a7eb3b0$0401a8c0@xphd97xgq27nyf"
      type="cite">
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      <div><font face="Arial">MF/LF</font></div>
      <div><font face="Arial">First observations indicate that the radio
          is a good performer on HF with appropriate antennas but on
          MF/LF with large antenna arrays there is cross modulation and
          overload. This could be overcome with a stepped ext attenuator
          or using smaller antennas on receive.</font></div>
      <div><font face="Arial">Some other radios that I havd tried are
          useless on LF/MF with small antennas but very good with large
          antenna arrays.</font></div>
      <div><font face="Arial">73 de mal/g3kev</font></div>
      <div>&nbsp;</div>
      <div>&nbsp;</div>
    </blockquote>
    Mal,<br>
    <br>
    FlexRadio info, valid for Flex 5K and 3 K (Flex 1k5 below 500 kHz)&nbsp;
    <br>
    <br>
    <b>Note 7: Customer provided pre-selector or appropriate low pass
      filter(s) required to eliminate images when used below 1.8 MHz</b><br>
    <br>
    For a good performance of your SDR you need a band pass filter for
    136 kHz and 500 kHz, an attenuator is not enough to get rid of all
    the ghost signals that show up on and around these bands.<br>
    <br>
    Albert<br>
    <br>
    <br>
    <br>
    &nbsp; &nbsp; &nbsp; <br>
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