[hpsdr] MW DXpedition Ozy/Janus/Atlas Comments

[Ramakrishnan Muthukrishnan]

On 9/22/07, dx at guyatkins.com <dx at guyatkins.com> wrote:
> ***** High Performance Software Defined Radio Discussion List *****
>
> I'm currently in the middle of a week-long medium wave DXpedition on the
> northern tip of Masset Island, in the Queen Charlotte Islands chain off the
> coast of Northern British Columbia, Canada. My four DXer friends and I have
> six SDR radios of various models amongst us, but I am the only one with a
> SDR-1000 & HPSDR boards.
>
> Some may recall my recent posting of photos and descriptions of my homebrew
> enclosure for the radio, HPSDR boards, and custom LP filters for the MW &
> LW bands. On the DXpedition, I have been able to do very careful listening
> and comparisons for results on weak signals with the balanced IQ connection
> between Janus and the SDR-1000, using Ahti Aintila's nice modification
> (bypasses the INAxxxx amplifier to send balanced IQ direct to the Janus
> board).
>
> It turns out that this balanced input approach does not have the needed
> gain to resolve very weak signals, at least on the MW "splits" on 9 kHz

What were your JP1, JP4, JP3 and JP6 status? Were the jumpers set or
were they open? They should be open for balanced input. Input is
applied at J2. (Phil, correct me if I am wrong).

Ramakrishnan, VU3RDD

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