[hpsdr] Neat front end from Phil

[Ray Anderson]

Ahti-

One more question. I see you call out a MS40B transformer for the RF and
clock input coupling. Is that a Philmore part #? What is the turns
ratio?  I think one of the  Mini-Circuits ADT series parts should be
similar. 


-Ray

-----Original Message-----
From: Ahti Aintila [mailto:oh2rz.sdr at gmail.com] 
Sent: Monday, July 31, 2006 3:12 PM
To: Ray Anderson
Cc: hpsdr at hpsdr.org
Subject: Re: [hpsdr] Neat front end from Phil

Ray,

I forgot the draft layout. Here it is. The size is about 44mm x 42mm :
<http://kotisivu.dnainternet.net/ahti/sdr-1000/newmixbrd4.pdf>. If
this works, I will leave it permanently inside my SDR-1000.

73, Ahti OH2RZ

On 31/07/06, Ray Anderson <ray.anderson at xilinx.com> wrote:
> ***** High Performance Software Defined Radio Discussion List *****
>
> The LT1127 has a noise spec of 4.2nv/rtHz max while the LT1128 is
rated
> at 1.1nv/rtHz max. Not sure about the current noise. The difference in
> noise could be significant in this application.
>
>
> -Ray    WB6TPU
>
>
> -----Original Message-----
> From: hpsdr-bounces at hpsdr.org [mailto:hpsdr-bounces at hpsdr.org] On
Behalf
> Of Ahti Aintila
> Sent: Monday, July 31, 2006 11:50 AM
> To: kd5nwa at cox.net
> Cc: hpsdr at hpsdr.org
> Subject: Re: [hpsdr] Neat front end from Phil
>
> ***** High Performance Software Defined Radio Discussion List *****
>
> Bob,
>
> LT1127 has better gain-bandwidth (65MHz)  than LT1128, and still
> available as a package of four opamps. If we accept two packages,
> OPA1632 can do upto 180MHz.
>
> On the other hand, as we are integrating the modulation bandwidth
> (<200kHz), maybe, the high gain-bandwidth product is not necessary.
> In any case, the RC product of the integrating circuit will limit the
> bandwidth with either in  the "passive" integrator like the Tayloe
> detector or the new "active" integrator, ISD. I'm possibly wrong, but
> somebody else in the group may know this better.
>
> 73, Ahti OH2RZ



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