[linrad] Re: Fwd: [softrock40] Ver 7 28Mhz preamp? Yes

[Giancarlo Moda <yahoo.com; i7swx@xxxxxxxxxxxxxxxx>]

Hi all,

the preamplifier at 28MHz is required when the VHF-SHF
converter has a low gain and its output is designed
for a higher gain IF like the one used in Linrad HDW
or others.

I would suggest to add the W7AAZ preamplifier using
4xJfet in parallel, as used in the CDG2000 and
Pic-A-STAR. This preamplifier has a very low noise
(expected below 2dB)and another important aspect: The
output impedance changes are no reflected to the input
like for the Norton amplifier. It also has a high IIP3
(>+35dBm).

You may visit: http://www.warc.org.uk/ and look for
the CDG2000 project.

73

Gian
I7SWX




--- w3sz <w3sz@xxxxxxxxxxx> wrote:

> Hi, All,
> 
> Just a note for those interested in using the
> SoftRock v7.0 as a backend  
> for transverters, forwarded from the Yahoo Softrock
> group.
> 
> Unfortunately, he didn't provide details on what his
> system actually was.   
> But it is still some information ;)
> 
> As always, ymmv.
> 
> I hope to start receiving my SoftRocks late this
> week or early next week,  
> and then should have some reports for all.
> 
> 73,
> 
> Roger
> W3SZ
> 
> ------- Forwarded message -------
> From: pxxxxxxxxis <bxxxx@xxxxxxx>
> To: softrock40@xxxxxxxxxxxxxxxx
> Subject: [softrock40] Ver 7 28Mhz preamp? Yes
> Date: Sun, 30 Apr 2006 19:07:48 -0400
> 
>     This morning I was using the Ver7 with my
> 28/144Mhz receive
> converter for a receive IF on 10Ghz rain scatter. I
> tried the system
> WITHOUT the 28Mhz preamp I have been using. I could
> see nothing but a
> few spikes in the 96Khz range. Added the 28Mhz
> preamp again and the
> 9-10db 10Ghz rainscatter signal from W0GHZ was easly
> seen. .... 28Mhz
> preamp REQUIRED for my system!
> 
> Yahoo! Groups Links
> 
> -- 
> Roger Rehr
> W3SZ
> http://www.nitehawk.com/w3sz/
> 
>
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