[hpsdr] Proposal for a 'low-end' RX/TX board for HPSDR

[Eric Ellison]

Bob

Some hints? You know I LOVE reading this stuff I don't QUITE understand, but
LOVE to try! (smile). Fixed how? Phil_H has brought this up so many times on
Teamspeak it is a litany! (smile, you know you have Phil!). I do agree, and
have seen the attempts at excitement only to see it 'crash again'! > !Freq =
!noise! ?????

Eric


-----Original Message-----
From: hpsdr-bounces at hpsdr.org [mailto:hpsdr-bounces at hpsdr.org] On Behalf Of
Robert McGwier
Sent: Tuesday, July 25, 2006 6:34 PM
To: kd5nwa at cox.net
Cc: hpsdr at hpsdr.org
Subject: Re: [hpsdr] Proposal for a 'low-end' RX/TX board for HPSDR

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

Robert McGwier wrote:
> ***** High Performance Software Defined Radio Discussion List *****
>
> The six meter band is so quiet that the optimal QSD will not be quiet 
> enough in all cases and a preamp will be required.  It is good we know 
> we are starting with circuits that have the noisier as we go higher 
>   
noisier as we go higher problem FIXED

> problem.  This minimizes the amount of gain and the attendant decrease 
> in OIP3 that results.
>
> Bob
> N4HY
>
>
> KD5NWA wrote:
>   
>> ***** High Performance Software Defined Radio Discussion List *****
>>
>> Lower QSD noise is a good thing, and a worthy goal, but is not the 6M
band so 
>> quiet that it would benefit from a pre-amp anyway in order to receive
very 
>> weak signals?
>>
>> Signals so weak that in the lower bands they are masked out by
atmospheric 
>> noise but not so in the 6M band.
>>
>> Even with lower QSD noise the noise of the sound card has to be overcomed

>> also, although the figures comming out of the Janus are simply wonderful.
>>
>> Fix the QSD problem if it's fixable but I would not count out a low noise

>> pre-amp. With a lower noise QSD you might not need very much gain but it 
>> might be nice to be able to kick it in if needed.
>>
>>
>>   
>>     
>
>   


-- 
AMSAT VP Engineering. Member: ARRL, AMSAT-DL, TAPR, Packrats,
NJQRP/AMQRP, QRP ARCI, QCWA, FRC. ARRL SDR Wrk Grp Chairman
"An expert is a man who has made all the mistakes which can be
made in a very narrow field."  Niels Bohr

_______________________________________________
HPSDR Discussion List
To post msg: hpsdr at hpsdr.org
Subscription help: http://lists.hpsdr.org/listinfo.cgi/hpsdr-hpsdr.org
HPSDR web page: http://hpsdr.org
Archives: http://lists.hpsdr.org/pipermail/hpsdr-hpsdr.org/


 1153869833.0