[hpsdr] Gibraltar Prototyping

[Alex]

How about the Cypress FX2? It's a nice package, plus the design layout can  be reused from OZY-USB.

Alex, N3NP 

----- Original Message ----
From: pvharman at arach.net.au
To: Steven Bible <n7hpr at tapr.org>; Steven Bible <srbible at earthlink.net>
Cc: hpsdr at hpsdr.org
Sent: Thursday, June 8, 2006 9:11:34 PM
Subject: Re: [hpsdr] Gibraltar Prototyping

***** High Performance Software Defined Radio Discussion List *****

Hi Steve,

That sounds like a good plan. I started to use the 18F4550 as a way of getting 
an A/D to USB converter going but because of all the problems I ended up using 
the FX2 and FPGA.  The 18F4550 does work OK but be aware of a couple of 
things. 

1. You need to run all your code in a state machine so you frequently service 
the USB hardware. 
2. If you intend to use the USB function of the 18F4550 then check the C 
compiler support. I strongly suggest that you avoid the FED product, that is 
what I tried to use and it was full of bugs. 

73's Phil...VK6APH 





Quoting Steven Bible <srbible at earthlink.net>:

> ***** High Performance Software Defined Radio Discussion List *****
> 
> As Bob has already aluded to, all these techniques have the same pricinples
> involved.
> 
> I've started on Gibraltar and for first pass I was planning on the Reflock II
> design with the iLotus M12M and Trimble-T GPS footprints, and for OCXO, the
> Crystek and Valpey-Fisher footprints.  This way we can experiement with each.
>  
> 
> I could also include a microcontroller on the PCB for added flexibility.  I
> would suggest the PIC18F4550 full speed USB microcontroller.
> 
> - Steve N7HPR
> 
> 
> 
> 
> -----Original Message-----
> >From: "Christopher T. Day" <CTDay at lbl.gov>
> >Sent: Jun 8, 2006 10:27 AM
> >To: Lyle Johnson <kk7p at wavecable.com>
> >Cc: hpsdr at hpsdr.org, FRANCIS CARCIA <carcia at sbcglobal.net>
> >Subject: Re: [hpsdr] Gibraltar Prototyping
> >
> >***** High Performance Software Defined Radio Discussion List *****
> >
> >Exactly. That article has been in my pile for some time. I originally
> >had thoughts of combining the Crystalizer kit, the Antenna Analyzer
> >Temperature control for same, Shera's GPS stabilization technique and my
> >cheap Delua GPS module with a 1PPS output, just to see what one could
> >wind up with. However, I've been too distracted by other things so far.
> >[What I just described sounds a lot like a cheapo Gibraltar, doesn't
> >it?]
> >
> >
> >    Chris - AE6VK
> >
> >
> >-----Original Message-----
> >From: Lyle Johnson [mailto:kk7p at wavecable.com] 
> >Sent: Thursday, June 08, 2006 10:21 AM
> >To: Christopher T. Day
> >Cc: FRANCIS CARCIA; hpsdr at hpsdr.org
> >Subject: Gibraltar Prototyping
> >
> >> I would suggest that the RefLock II could be used as a Gibraltar 
> >> prototyping system similar to the way PhilH and Bill have been using
> >the 
> >> Xylo board for prototyping Janus.
> >
> >Consider also some of the techniques employed in the GPS oscillator 
> >stabilization system designed by Brooks Shera 
> ><http://www.rt66.com/~shera/index_fs.htm>
> >
> >73,
> >
> >Lyle KK7P
> >
> >
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> 
> \r\n- Steve\r\n  (n7hpr at tapr.org)\r\n
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