CW Users:- HDSDR and ExtIO_SRlite for Softrock RXTX

On the HDSDR Hardware page is a download link for
This ExtIO DLL provides COM port CW keying and PTT for Softrocks and other SDRs. The downside is that only one DLL may be selected so for the current Softrock Ensembles embedded tuning and PTT is lost and some modification will be required.

Will provide transmit capability for suitable SDRs on Linux or the Mac with Wine.

This may be used with earlier crystal controlled or Si570 switch-tuned Softrock RXTXs without modification as these do have COM port PTT.

This DLL is provided by the HDSDR team. But do not expect any update. 

So, after downloading and unzipping place the DLL in HDSDR's program folder.
Select the DLL when starting HDSDR

Then, when you click ExtIO or press H on the keyboard this is shown

An Ensemble RXTX will need COM port PTT added. On this page
is a way to do this.

This shows the back, connection side, of a female plug.

Normal 9 pin COM port.
Choices, all must be different Function 
CW Input Pin 1,6,9 Connect CW key, one side to 5 volts through a resistor. Or to keyer with high output.Set high:- Key down to set HDSDR to transmit CW this also sets the chosen TX Output Pin to high, setting the transceiver to TX mode.
TX Output Pins 4,7,9 
Connect to transceiver PTT
(WSPR DTR 4 or RTS 7)
Goes high:- Puts RXTX into transmit mode either when CW key is pressed in CW mode or when mic PTT is pressed in voice mode.. 
 TX Input Pins 1,6,8,9
Connect to microphone PTT, Other side to 5 volts through a resistor.
Set high:- In voice mode puts RXTX to transmit mode. 
5 volts is a nominal value.
5 to 12 volts may be used with a safety resistor around 47K. The current taken is small, a 9 volt battery can be used.
Everything could be fitted inside the Ensemble box if there is room for the sockets. To be able to control ground loops I would insulate these.

A schematic.
Any small diode. The resistors are just a safety measure, 4K7 upwards.
My Ensemble Mods page shows the PTT one inside the Ensemble.
Ground:- If this causes a ground loop it can usually be removed, the PTT return will use the other path.

Tuning a USB Softrock

CFGSR will have to be used independently of HDSDR to set the centre frequency.
In HDSDR use the key pad, type in the frequency in KHz - "L" - Enter.
The LO is set to the same as CFGSR. Right click "LO" and the HDSDR centre frequency is locked.
CFGSR has 9 memories
9 may be sufficient for CW operators.
Enter your required frequency in the text box. Click "S" and it is stored by clicking a number button.
Click that button to recall.

Installing and Using HDSDR

G4ZFQ December 2012
alan4alan at googlemail com
More of my pages related to SDR
Setting up CFGSR for different versions of the Softrock

All aspects of the Softrock SDR a big page with lots of links but you should find answers to most questions.

 1 The Si570        
2 Getting and Making Softrocks What computer?          
3 Building a Softrock. Or look at        
4 For Information Surrounding the Softrock  VHF converter, MOBO, PAs, Panadapter for use with conventional rigs etc.    
5 Soundcards Setting up, USB, problems.      
6 PIC/PICAXE control of the  Si570, Tony's first method. switched control without a computer. Reprogramming the PIC (and PICAXE)          
7 Parallel Port Control of the SI570.        
8 USB Control of the SI570  Information, driver installation. BPF control.       
9 Serial (COM) Control of the Si570.         
10 Some Stand-alone Controller Kits Control the Si570 independently. Links to other SDR kits. Notes and links for all soundcard SDR software I know. 
Including Modes not yet Supported by these SDR Programs.  Audio Files to Test Software Without a SDR And a few links to some of the many SDRs on the web. Check them out without owning one.