[WriteLog] What's wrong with AFSK? was - 5 bit mystery unraveled

[Nick Kail]

Jim 
I think you will find that you get a "cleaner" transmission and reception
using FSK compared to AFSK as the txRx is doing the right job in the right
mode. I for one have noticed on my 746 during contests that I can pick up
weaker signals in the RTTY mode compared to the LSB mode. Which in may case
is why I am working with MicroHam to create this ability on their USB
interface. 

Cheers
Nick 
2E0MLR 
-----Original Message-----
From: writelog-bounces at contesting.com
[mailto:writelog-bounces at contesting.com] On Behalf Of Jim Smith
Sent: 01 March 2004 07:48
To: writelog at contesting.com
Subject: [WriteLog] What's wrong with AFSK? was - 5 bit mystery unraveled

It seems to me that the cognoscenti prefer FSK to AFSK.  I have never 
seen any reasons for this preference, probably because I haven't looked 
in the right place.  So, what's the problem with just sending AFSK to 
the radio, thereby eliminating the need for an AFSK to FSK converter?

Bill Turner wrote:

>On Sat, 28 Feb 2004 06:50:04 -0600, Bob Naumann - N5NJ wrote:
>
>  
>
>>For the time being, if you want to control your radio, and you want to run
FSK, you will need 2 serial ports. 
>>    
>>
>
>_________________________________________________________
>
>I wonder if it might be possible to make an AFSK to FSK converter?  A
>simple detector which would be driven from the soundcard output,
>detecting the mark and space audio tones and converting them to a DC
>level suitable for driving the FSK input?  Perhaps a PLL type circuit?
>
>It might miss a cycle or two of the 2125 Hz audio during switching, but
>I doubt if the timing is that critical.  What do you think?
>
>--
>73, Bill W6WRT
>QSLs via LoTW
>
>
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>
>  
>

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