To: rsgb_lf_group@blacksheep.org
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 <1283782765.9999818.1480859806446@mail.yahoo.com>
 <41b1da16-f5a4-b3d4-53c0-e2c9f405c92d@mollies.freeserve.co.uk>
 <39D3D21292BB4545816F891373132AE9@AGB>
From: Martin Evans <books@mollies.freeserve.co.uk>
Message-ID: <275ff02f-1f04-631a-ba12-ba2e49015080@mollies.freeserve.co.uk>
Date: Sun, 4 Dec 2016 15:52:45 +0000
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Subject: Re: LF: Best SDR for LF.
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Status: O

Thanks Graham.

Not really that interested in transmitting - been licensed over fifty 
years and done my share - far more interested in earwigging these days!

Nope, Elad it is I think.

Martin GW3UCJ.


>
>
> The holy grail  is to  find one that  transmits  as  well , there  was 
> one tx/rx  demonstrated a few years  back  at the  rsgb convention, 
> which was to retail round  £200 , that  price looks to be the  norm 
> now ,  but if it also tx's then that's more use ..
>
> There  is  a  new  ''kiwi sdr''   rx-only  $200 , which is showing up  
> as a  web linked system by the  users ,  this  seems to be  very  good
>
> Other than  that , lots of  lower  bit ones about ,  but even with  
> lots of bits ,  there  dynamic  range , is not going to  get close to  
> the  like's of the  racals  5 watt mixer drive  120 dB 4 fet cct and 
> there is  some conjecture round the  actual  usable number of bits , 
> compared to the physical bit  count ,
>
> In saying that , the rtl  8 bit  works better  than  the ft897 on 1.8 
> and 3.5 mhz  :(
>
> pre- b/w  filtering  would appeared to be required to  keep  the out 
> of band  carriers  at a  reasonable level
>
> 73-G,
>