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Re: [linrad] QEX Sept/Oct 2003 & AOR's Newest Offering


   Hi Bob and Colbern,

   Though I never had a long and deep look in Leif's software source code
   package, I do not believe that any of those functions is implemented yet.
   I am not even sure they are planned in the future.

   At present,  Linrad is basically a dual channel LF spectrum analyser
   with filtering very effective noise blanking capabilities in software
   and a good sound card plus computer.

   Leif has made big efforts to maintain the NF and dynamic range
   of whatever proceeds Linrad back to the antenna, receiver,
   converters ,etc. to mix the uW/UHF/VHF/RF/LF down to the audio input
   frequency spectrum of the sound card, a Delta44 as the top of the 
   line at present. ( dual channel, low noise, high dynamic range 

   Up to this point, it is all in software and the connection 
   from the VHF/HF/LF side to linrad is done with 1 ( 2 ) wires. 

   Besides the software that makes up Linrad  Leif has
   designed optimized hardware to mix down IF VHF signals to audio
   signals. ( 144, 70, 10, 2.5 MHz )

   see: http://www.antennspecialisten.se/en/index.html#  

   look under Under "HAM/LMR" ( English version )

   So a comparison between a hardware modem, the ARD9800 and 
   an audio processing software package, Linrad, is  
   difficult to make.

   One could compare the functions and specs of Linrad to
   the same functions, if any, provided by the ARD9800 unit.

   But that is like apples oranges.

   73 Rein W6/PA0ZN

    http://www.nitehawk.com/linrad_dat/

   Down at the links portion you find a better link to the
   hardware section that can be used with Linrad.



Robert McGwier wrote:
> 
> My apologies Colburn.  I seem to have missed the AMBE2020
> encoder and decoder software in Leif's software package.
> Can you please point me to the subroutines?  I am also
> missing the linrad exciter and power amplifiers and the
> receive front end that connects to the antenna.
> I haven't found the subroutines for that either.
> 
> I am totally unimpressed with the ARD9800 and so will the
> users that attempt to use it on long haul circuits.
> It must be low power since it only draws 200ma at 12V.
> On the other hand, it is clear that Linrad, which is a
> great thing, is not everything.
> 
> Bob
> N4HY
> 
> -----Original Message-----
> From: owner-linrad@xxxxxxxxxxxxxxxxxxxxxx
> [mailto:owner-linrad@xxxxxxxxxxxxxxxxxxxxxx]On Behalf Of Colburn
> Sent: Friday, September 05, 2003 04:10
> To: linrad@xxxxxxxxxxxxxxxxxxxxxx
> Cc: moon-net@xxxxxxxx; vhf@xxxxxxxxxxxxxxxxx
> Subject: Re: [linrad] QEX Sept/Oct 2003 & AOR's Newest Offering
> 
> > In Leifs article in QEX, September/October 2003 issue, titled
> > Linrad: New Possibilities for the Communications Experimenter, Part 4,
> 
> Anyone compared LinRad to AOR's product?
> http://www.aorusa.com/ard9800.html
> 
> Seems to me it would be real hard to justify $549. for their
> hardware-plus-pc solution when LinRad does the same stuff for free and
> needs no special hardware.
> 
> Between LinRad and Pactor III (still not available using any Linux app I
> have identified) one could really make some neat things happen under
> pretty tough band conditions -- a few bugs worked out and it would make
> sense to recommend them to emergency communications folks!
> --
> --
>   ~~~
> o['|']o
>   \~/
>    | ```@ {Thanks! & 73 doc kd4e}
>   | |__/
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