[Premium-Rx] FW: Cubic R-3040 ?

[Carcia, Francis A HS]

 Hi Guys,
I'm having a ball with my SDR interface connected to my RA6830. My module
plugs into the radio and looks like it came from Racal. The soft rock 40
guys are shipping their latest version softrock V6. All it would take is a
crystal change and input filter changed to a 50 ohm pad. The soft rock guys
are selling kits for $14 a lot cheaper than it cost me. fc

-----Original Message-----
From: premium-rx-bounces at ml.skirrow.org
[mailto:premium-rx-bounces at ml.skirrow.org] On Behalf Of A. and T. MacDonald
Sent: Sunday, April 02, 2006 8:50 PM
To: 'spencer bahner'; premium-rx at ml.skirrow.org
Subject: RE: [Premium-Rx] FW: Cubic R-3040 ?

Thanks Spencer,

I only wish it had 5 complete RF paths!  I suspect (will confirm later)
that there are 5 IF strips that follow a common RF and first IF path at
the standard Cubic 40.455 MHz IF freq.  Not sure if there is a special
application that requires independently filtered yet simultaneous IF
outputs.  Perhaps there are reasons to feed demodulators simultaneously
using different filter bandwidths?  Optimized SNR Matched filtering?
Signal Recognition using varying bandwidths?  It is possible that each
path has an independent BFO that allows a bunch of FSK signals clustered
around the central RF freq to be demodulated by a WJ-9815 or similar.
Odd...

Thanks for the input.

adam

-----Original Message-----
From: premium-rx-bounces at ml.skirrow.org
[mailto:premium-rx-bounces at ml.skirrow.org] On Behalf Of spencer bahner
Sent: Sunday, April 02, 2006 8:15 PM
To: calvinf15 at earthlink.net; premium-rx at ml.skirrow.org
Subject: RE: [Premium-Rx] FW: Cubic R-3040 ?



I would suggest it is actually a DF receiver (common LO feeding the 
individual RF/IFs). This allows external circuitry to be used to
determine 
the differential between direction- time difference or however the
'spooks' 
do it). Does it have five RF paths or just IF? Multiple IF paths alone 
usually imply some flavor of ISB-like operation...


>From: "A. and T. MacDonald" <calvinf15 at earthlink.net>
>To: <premium-rx at ml.skirrow.org>
>Subject: [Premium-Rx] FW: Cubic R-3040 ?
>Date: Sun, 2 Apr 2006 11:52:56 -0400
>
>Hi Folks,
>
>I just purchased a Cubic R-3040 on ebay.  Here's a link if you're
>curious: http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem
><http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=7603121526&rd=1&ssp
>a
>gename=STRK%3AMEWN%3AIT&rd=1>
>&item=7603121526&rd=1&sspagename=STRK%3AMEWN%3AIT&rd=1 (item number
>7603121526)
>
>I suspect that it is a specialized HF receiver with multiple 
>simultaneous IFs (for the FAA?), and I bought it as a front-end for 
>some DSP radio experiments I am running.  I haven't received it yet, 
>but am looking for anybody who's had experience with one of these.  I 
>found a reference to the R-3050 in Fred's bible, but not the R-3040.  I

>suspect that I might be similar to a 3030 perhaps with some parallel IF

>strips on the back of the 40.455 first IF?  Not really sure what it's 
>intended application was.  I plan to digitize the IFs for introduction 
>into some DSP downcoversion software I am writing.  If there's any 
>real-estate inside, I might just put a TI or Analog Devices DSP board
in for an
>integrated demodulator option. Thanks for any leads .   Educated
guesses
>welcome!
>
>adam, N1GX


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