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Re: [RTTY] Response to DX Station

To: RTTY Reflector <rtty@contesting.com>
Subject: Re: [RTTY] Response to DX Station
From: Kok Chen <chen@mac.com>
Date: Thu, 11 Aug 2011 15:46:01 -0700
List-post: <rtty@contesting.com">mailto:rtty@contesting.com>
On Aug 11, 2011, at 12:46 PM, W3OA wrote:

> I've just watched the CE0Y/I2DMI and 9X0TL videos. 

By the way, DL2RUM is not just the op at 9X0TL, Tom himself wrote that program 
(RUMped) which you see him using.  cocoaModem is used just as the RTTY 
demodulator.

Tom also gets the spectrum for his waterfall from cocoaModem using 
AppleScripts. 

The RUMped waterfall on the right side of the RUMped window, is scaled down by 
a factor of two from the "native" cocoaModem waterfall and Tom had kept the 
same color mapping as the one used in cocoaModem's waterfall.  When he clicks 
on the waterfall, the coordinates are passed back to cocoaModem (again using 
AppleScripts) and cocoaModem retunes the demodulator (horizontal click 
location) and the amount of the audio history to play back (vertical click 
location).  I think Tom might have maintained the fine-tuning mechanism (mouse 
scroll wheel) which cocoaModem uses.

The cross banana display is too compute intensive to pass through AppleScripts, 
so that tuning indicator is a window that "belongs" to cocoaModem.  Every green 
dot in the window is drawn and redrawn every 0.1 ms or so to mimic the phosphor 
decay from a real scope, and the crossed banana uses up more processor cycles 
than everything else in cocoaModem's RTTY interface combined!  

The crossed ellipse tone pair changes each time a different frequency is 
clicked on the waterfall.  One day, I should try to do a better stand alone 
crossed ellipse program; I was never happy with the appearance when compared to 
a slow phosphor scope that is fed from a good pair of analog filters.

Tom has another program (RUMlog) for more day-to-day logging.  RUMped is for 
hard core DXpeditions and contesting.

RUMped/RUMlog and cocoaModem don't even share the same programming language or 
framework/libraries.  Tom uses REALbasic, while cocoaModem uses Objective-C and 
Cocoa (thus the name of the program -- Mac OS X Cocoa came from the NeXTStep 
system, which was what Sir Tim Berners-Lee had used to write the first "web 
browser" at CERN).  If you own an iPhone or iPad, all the apps for them are 
written with the Cocoa framework.

73
Chen, W7AY

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