[hpsdr] You know this ?

[Roland Etienne]

Bob,

100 Hz or 100 Khz? 

Roland, f8chk

-----Message d'origine-----
De : hpsdr-bounces at hpsdr.org [mailto:hpsdr-bounces at hpsdr.org] De la part de
Robert McGwier
Envoyé : lundi 21 août 2006 14:11
À : Robert McGwier
Cc : KA2WEU at aol.com; JohnGibbs at IcomAmerica.com; hpsdr at hpsdr.org
Objet : Re: [hpsdr] You know this ?

***** High Performance Software Defined Radio Discussion List *****

I see on the folder they are claiming these figures of merit down to 100 
Hz.  That is very good indeed.  I hope it holds up in (say) the ARRL labs.


Bob
N4HY


Robert McGwier wrote:
> Without seeing the detailed specifications on this receiver,  it is 
> hard to tell what this really means.  The manufacturers, all of the 
> big 4,  publish their 20 kHz specifications while having their roofing 
> filters tuned down to much less.   In every case I have seen so far,  
> the receiver front ends fold as the interfering signals get inside the 
> roofing filter.  The ISD/QSD front ends will have these kinds of 
> numbers down to a few hundred Hz.  These measurements will be limited 
> only by the quality of the generators in the two tone tests.
>
>
> Bob
> N4HY
>
> KA2WEU at aol.com wrote:
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-- 
AMSAT VP Engineering. Member: ARRL, AMSAT-DL, TAPR, Packrats,
NJQRP/AMQRP, QRP ARCI, QCWA, FRC. ARRL SDR Wrk Grp Chairman
"You see, wire telegraph is a kind of a very, very long cat.
You pull his tail in New York and his head is meowing in Los
Angeles. Do you understand this? And radio operates exactly
the same way: you send signals here, they receive them there.
The only difference is that there is no cat." - Einstein

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