[Mldxcc] RTTy contest

[John Kozusko]

Thanks for the input.  With time constraints this week I will need to use AFSK.  I will look at modifying the Signal Link later, although I am not sure I am technically competent enough to make the mod.
 
John



On Friday, December 26, 2014 2:59 PM, w6de <w6de at tealpond.com> wrote:
 


Here is some information that will help point the way to make a FSK interface through a SignaLink for FSK-RTTY with an Icom radio.
 
1) A serial transistor interface adapter:
http://www.k5nd.net/2013/08/fsk-interface/
This shows circuitry for both the FSK data line and PTT.  For the basic FSK SignaLink interface just use the FSK portion
 
2) Basic interfaces using transistors or optioisolators:
http://www.dxlabsuite.com/Wiki/Graphics/WinWarbler/FSK-NPN.jpg
http://www.dxlabsuite.com/Wiki/Graphics/WinWarbler/FSK-Opto.jpg
Both of these basic circuits and more information is available here at DXLab:
http://www.dxlabsuite.com/dxlabwiki/FSKConnection
Don’t be thrown off by the WinWarbler terminology it is DXLab’s adapted version of MMTTY.
 
3) Modifying the SignaLink to put the FSK interface inside it:
http://www.k7sfn.com/projects/signalink.html
 
SignaLink jumpers for Icom 8-pin DIN Accessory Port Connector
IMPORTANT:  This diagram is for the ACCY PORT only. 
JP-1 Pin-out
Pin 1 - RTTY (FSK)
Pin 2 - Ground 
Pin 3 – Send (PTT)
Pin 4 - Mod In 
Pin 5 - AF Out
Pin 6 - Squelch
Pin 7 - +13.8V
Pin 8 - ALC Radio Models
IC-275A
IC-575A/H
IC-707
IC-725/726
IC-728/729
IC-735/736/737/738
IC-7400
IC-746**
IC-746PRO**
IC-756 / 756PRO
IC-756PROII / III
IC-761/765
IC-775/775DSP
IC-781
IC-7600/7700/7800
IC-820H/821H
IC-910H
IC-M600
IC-M700PRO
IC-M710
IC-M802  Notes
IC-756PRO users should use digital mode "D-USB" or "D-LSB".
**Some customers have reported that the IC-746 (early model only) does NOT mute the Mic when keyed from the Accy Port.  If this is the case with your radio, then you will need to turn the radio's Mic Gain down and/or unplug the microphone.
**Due to the design of the IC-746PRO, this jack does NOT support VHF operation.  If you want to operate both HF and VHF, then you'll need to use the 6-pin mini-DIN Data Port instead.
**IC-746PRO users should use "USB/LSB Data" mode (not regular USB/LSB).
IC-820H users need to set the Modulation Input Sensitivity switch to "Low", and the Baud Rate Selection switch to "AMOD". 
 
 
3) Set up of MMTTY to use FSK:
http://www.aa5au.com/rtty/getting-started-on-rtty/page-07/
 
4) I put my SignaLink interface inside the 9-pin D-shell connector:
Can’t post pixs on reflector. 
Those of you reading this on the reflector send me a note and I’ll send you a copy of the pixs.
 
 
Dave, w6de
 
 
 
-----Original Message-----
From: Mldxcc [mailto:mldxcc-bounces at contesting.com] On Behalf Of John Kozusko
Sent: Fri, 2014 December 26 20:34
To: mldxcc at contesting.com
Subject: [Mldxcc] RTTy contest
 
Thought I would try my hand at the RTTY contest coming up in a week or so.  I am using a signal link which will only run AFSK through my Pro II.  Is this going to work ok or do I need to move up to a Micro Ham Interface to run FSK.  I will be using MMTTY software.  Any thoughts would be appreciated.
 
John
WD6EIW
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