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A point that is being ignored in all of the discussions on DC radios is
that of the second order products that rarely means a lot to
superhetrodyne radios as they are well filtered. If you apply two
signals that are separated by the IF frequency (normally 11KHz for the
SDR100) you will see interference. I tested this on the one that I have
and found the dynamic range due to the subtractive second order product
to be about 70 dB. This would set the total dynamic range to 70 dB. A
note worth mentioning is that this product does not involve the Local
oscillator.
73 Brian KF6C.
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED]
Sent: Monday, September 12, 2005 7:26 AM
To: Mark Tyler
Cc: FlexRadio@flex-radio.biz
Subject: Re: [Flexradio] K2 has ONLY 80dB of third order dynamic rangevs
SDR-1000 98dB
The difference will largley be evident during contest operating when
there are many strong sigs and you're trying to work some close-by weak
ones.
I don't know if my SDR has a problem or if I have something set up
wrong, but while on last night after the flares subsided, I was working
someone on 20M and I started to get some AGC thumping. I tuned down
about 25Khz and heard someone with only a 10 over signal. He was only
about 2 miles from me and running 70W. But no way should I have heard
him that far away.....that's one of the reasons I chose this radio. Any
ideas as to why? I have everything set up in accordance with the manual
and quick start guide.
Running a homebrew EMI shielded computer with a 2.6G P4, 512M RAM and
the Delta-44 SC.
Tnx
Greg
AB7R
----- Original Message -----
From: Mark Tyler <[EMAIL PROTECTED]>
Date: Monday, September 12, 2005 5:01 am
Subject: [Flexradio] K2 has ONLY 80dB of third order dynamic range vs
SDR-1000 98dB
> ________________________________________
> From: [EMAIL PROTECTED] [EMAIL PROTECTED]
> Sent: Saturday, September 10, 2005 11:20 AM
> To: Mark Tyler; [EMAIL PROTECTED]
> Subject: K2 has ONLY 80dB of third order dynamic range vs SDR-1000
> 98dB
>
> In a message dated 9/10/2005 11:25:53 A.M. Eastern Daylight Time,
> [EMAIL PROTECTED] writes:
> http://www3.qth.com/pipermail/flexradio_flex-radio.biz/2005-
> September/002299.html
> >>>>>>>>>>>>>>>>>>>>>>>>>>>>>
> So...??
>
> Do you have some sound files that show what kind of difference
> that makes, and under what conditions?
>
> So many people base decisions on "specs", with no idea what kind
> of difference those specifications mean in real world performance.
> Hearing is believing. I for one would like to hear more evidence
> that goes beyond the numbers, such as is being presented for the
> NorCal 2030.
>
> http://www.norcalqrp.org/files/PacificonSoundFiles.exe
>
> Hopefully there are those on this -superlist- who are equipped and
> inclined to share that kind of "evidence" as it pertains to the
> various "specs" that are bandied about...
>
> 73
> Bill K3UJ
>
> _______________________________________________
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> FlexRadio@flex-radio.biz
> http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz
>
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