[hpsdr] VHF/UHF downconverter for HPSDR

[Willi Reppel]

Hi Ante,
You should buy Phil´s presentation of the ARRL/TAPR 2008 Digital 
Communication Conference, DVD #6 "Software Radio through the Looking Glass" 
where Phil explains the development of the Mercury receiver, the math behind 
it and hardware problems which had to be solved.
http://www.arvideonews.com/dcc2008/index.html

best 73 es gl
Sm6OMH  Willi
----- Original Message ----- 
From: "Ante Vukorepa" <o.orcinus at gmail.com>
To: <phil at pharman.org>
Cc: <hpsdr at lists.openhpsdr.org>
Sent: Monday, October 03, 2011 1:04 PM
Subject: Re: [hpsdr] VHF/UHF downconverter for HPSDR


> ***** High Performance Software Defined Radio Discussion List *****
>
> On Mon, Oct 3, 2011 at 11:38 AM, Ante Vukorepa <o.orcinus at gmail.com> 
> wrote:
>> On ponedjeljak, 3. listopada 2011. at 04:05, Phil Harman wrote:
>>
>> In which case an input signal at 383-50MHz = 333MHz, i.e. the image
>> frequency, will also give a signal at the IF frequency. If you want say
>> 100dB of image rejection then your 70cm bandpass filter(s) before the
>> mixer will need to provide this level at 333MHz.
>>
>
> Now that i've mentioned it, would an image rejection method as
> implemented in image reject mixers work, or would that produce
> rejection levels too low / losses too high?
>
> (Disclaimer: BTW, please bear in mind that, as i've said, i've never
> actively meddled in RF electronics of any kind, apart from an
> introductory course on RF comms in university some time ago, and am
> just beginning. Meaning i'm pretty clueless re: most of the matter
> concerned here.)
>
> -- 
> Ante Vukorepa
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