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

[Clemens Paul]

Hi,

> >The EM510 can process realtime I/Q data with a BW of 10MHz, the SDR14
> >max.150kHz.

>Not much call for 10-MHz-wide signal processing on the HF bands, although
>that's a very useful attribute for VHF/UHF receivers (see the various Ettus
>Research designs for that).

It seems to be quite useful for analyzing frequency hopping signals.
And there's lots of hopping on shortwave according to R&S.

>What ADC does it use?  There simply aren't that many choices on the market
>unless R&S is making their own chips.

They don't.
If it's not a company secret I might be able to find out the 16bit ADC type.

> >The preamp of the EM510 delivers an output of +16dBm into the ADC with a
> >SFDR of >96dB.
> >It was not easy even for the R&S engineers to design such a preamp.

>What does the term 'SFDR' mean with regard to a preamp?

I was also wondering a bit about that term in conjunction with a preamp,when I heard it from
one of the design engineers.
I believe it means summarizing all distortion products.
K2 is the critical parameter.

>I don't disagree -- I sure wouldn't throw one off of my bench. :-)  But I
>also don't think the competitive margin is quite as big as you're saying.

Ok,that competitive margin may exist only for certain users/services who need
the numerous special tools and features of the radio. 
My intention was primarily to show that the EM510 is already competitve with conventional
premuim rxs in any respect also with regard to dynamic range
and that the difference between a SDR14 and a EM510 is really more than the price tag and the
R&S logo. 

73
Clemens
DL4RAJ







 


----- Original Message ----- 
From: John Miles 
To: premium-rx at mailman.qth.net 
Sent: Sunday, February 18, 2007 4:13 AM
Subject: RE: [Premium-Rx] The new R&S EM510 Direct-Sampling HF Receiver


> >The SDR-14 has a DR3 of *34*dB for 500HZ BW (ARRL) which sounds absurd
> >(like the whole comparison) compared to 105dB.

I don't see how that could possibly be correct.

> >The EM510 can process realtime I/Q data with a BW of 10MHz, the SDR14
> >max.150kHz.

Not much call for 10-MHz-wide signal processing on the HF bands, although
that's a very useful attribute for VHF/UHF receivers (see the various Ettus
Research designs for that).

> >The ADC of the SDR14 overloads at -23dBm,the EM510's IP3 is tested with
> >2x-7dBm.

What ADC does it use?  There simply aren't that many choices on the market
unless R&S is making their own chips.

> >The EM510 is fully LAN controllable.
> >It's also interesting to have a look at the filter specs (there are none
> >with the SDR-14).

Again, that's all just commodity software (waves hand).

> >The preamp of the EM510 delivers an output of +16dBm into the ADC with a
> >SFDR of >96dB.
> >It was not easy even for the R&S engineers to design such a preamp.

What does the term 'SFDR' mean with regard to a preamp?

> >So there's a LOT more than buying an off the shelf  16bit ADC to
> design a
> >digital radio with
> >those specs.
> >And therefore I think the whole package inside the case IS exciting.

I don't disagree -- I sure wouldn't throw one off of my bench. :-)  But I
also don't think the competitive margin is quite as big as you're saying.

-- john, KE5FX

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