[Premium-Rx] The new R&S EM510 Direct-Sampling HF Receiver

[Mark Donaldson]

I don't know if I'm missing something here but
wouldn't adding a stage or two of AGC after the RF amp
eliminate all the dynamic range issues?

Mark Donaldson WA1QHQ


--- sig346 at netscape.net wrote:

> 
> 
> -----Original Message-----
> From: sig346 at netscape.net
> To: premium-rx at mailman.qth.net
> Sent: Thu, 15 Feb 2007 10:32 PM
> Subject: Re: [Premium-Rx] The new R&S EM510
> Direct-Sampling HF Receiver
> 
> 
> 
> 
> 
>  -----Original Message-----
>  From: sig346 at netscape.net
>  To: farson at shaw.ca; Premium-Rx at mailman.qth.net
>  Sent: Thu, 15 Feb 2007 10:01 PM
>  Subject: Re: [Premium-Rx] The new R&S EM510
> Direct-Sampling HF Receiver
> 
>     The RS Datasheet reveals potentially weakness of
> all Direct Sampling 
> HF Receivers: their limited
>   dynamic range. To hide this RS tries stretching
> both German and 
> English languages . As a result,
>   a new wording has been invented: LOW DISTORTION
> MODE. In this mode, 
> which actually is nothing
>   more than an attenuator at the input, the receiver
> has IP3 of 30dBm, 
> BUT NOISE FIGURE OF 26dB!.
> 
>   I will send email to Rhode und Schwarz suggesting
> one more mode: 
> ULTRALOW DISTORTION,
>   to obtain 50 dBm of IP3, but that would require
> 30dB attenuation, 
> bringing noise froor to
>   45 dB. It would be, nevertheless, sufficient to
> listening to Deutsche 
> Welle in the World Bavarian Capital of Munich.
> 
>   Rockwell Collins describing their similar direct
> sampling receiver 
> CX7800 simply "forgets" include some data
>   regarding dynamic range. That makes their life
> simpler: no need to 
> hide an army of technical linguists.....
> 
>   On a serious note, I tried CX7800. It is a
> respectable receiver, but 
> far from being "Premium", not much
>   better than SDR14. So, you, gentlemen - owner of
> WJ, TCI, CUBIC, 
> Telefunken, etc - remain cool -
>  your receivers are still "Premium" without
> stretching imagination.
> 
>  Regards,
>  AW
> 
> 
> 
>  -----Original Message-----
>  From: farson at shaw.ca
>  To: Premium-Rx at mailman.qth.net
>  Sent: Thu, 15 Feb 2007 2:31 AM
>  Subject: [Premium-Rx] The new R&S EM510
> Direct-Sampling HF Receiver
> 
>   Rohde & Schwarz have announced their new EM510
> direct-sampling HF
> 
> 
> intercept/surveillance receiver:
> 
> 
> 
> 
> 
> http://tinyurl.com/2lan7h  (EM510 brochure in PDF
> format, in German)
> 
> 
> 
> 
> 
> Cheers for now, 73,
> 
> 
> Adam VA7OJ/AB4OJ
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
>   --------
>   Check Out the new free AIM(R) Mail -- 2 GB of
> storage and 
> industry-leading spam and email virus protection.
> 
> 
> 
>
________________________________________________________________________
> Check Out the new free AIM(R) Mail -- 2 GB of
> storage and 
> industry-leading spam and email virus protection.
> _______________________________________________
> Premium-Rx Mailing List
> To Post: premium-rx at mailman.qth.net
> For Info:
> http://mailman.qth.net/mailman/listinfo/premium-rx
> Visit the Website:
> http://kahuna.sdsu.edu/~mechtron/PremRxPage/
> Help: http://mailman.qth.net/mmmain.htm
> 
> 



 
____________________________________________________________________________________
8:00? 8:25? 8:40? Find a flick in no time 
with the Yahoo! Search movie showtime shortcut.
http://tools.search.yahoo.com/shortcuts/#news