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Hello all,

First: I did not receive my Softrock-40 yet and everyday new software
popups for it. I guess that I will have trouble to choose when I
receive it.
Thanks to all the developpers for all these neat applications.

I have been interested in SDRs since I discovered Flex Radio a few
years back and the SR-40 will be a good start to experiment.

I am a 6m op and my dream is to developp one exclusively for 6m.

The SDR-1000 does 6m, but it seems it is by chance:
No PA has been developped for it
I did not find any review for the 6m part
The DDS is at is upper limit for 6m and I guess that the spurs are
more of a problem on these frequencies.

My idea is to use a SDR as a variable IF with a downconverter ahead.
The new SDR Version 5 by Tony would be a good start to experiment.

Any idea would be welcome. On my side this is what I think:

A not so high gain preamp (U310 with 10dB gain).
A diode balance mixed (SBL-1 / TUF-1)
A post mixed amplifier (2N3866) followed by an attenuator pad (how
much attenuation?)
A SR Version 5 tunable on 9Mhz (or any other suitable IF)

If that works what about a more high performance SDR. I tried to find
schematics of the latest QSD used in the SDR-100 but did not find
anything.

Jean-Claude PJ2BVU