[hpsdr] A/D

[Phil Harman]

My current Mercury prototype works fine on 2m with the input filters 
bypassed - it will  need a suitable preamp and bandpass filter for serious 
use but for monitoring  the local repeaters it's OK as is.  I think the 
LT2208 input is specified to 700MHz.

So the answer is Yes!

73's Phil... VK6APH


----- Original Message ----- 
From: "Lyle Johnson" <kk7p at wavecable.com>
To: "Jason A. Beens" <jbeens at sensetechnologies.com>
Cc: <hpsdr at hpsdr.org>
Sent: Sunday, April 22, 2007 7:22 AM
Subject: Re: [hpsdr] A/D


> ***** High Performance Software Defined Radio Discussion List *****
>
> Hello Jason!
>
>> Is there any plan for undersampling the incoming signal?  You can recover
>> the information on a carrier by satisfying Nyquist over the bandwidth of
>> the modulated signal.  You cannot recreate the carrier in this manner,
>> but the contents of the carrier can be demodulated.
>
> As long as the information is band-limited, you can certainly
> undersample the RF and downconvert in the A/D.  You should be able to
> bypass the filters in Mercury, allowing you to do this sort of thing
> using external filters.
>
> I have done this with my SDR-14 to listen to 2 meters, for example.
>
> 73,
>
> Lyle KK7P
>
>
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