On the HDSDR Hardware page is a download link for ExtIO_SRlite.zip
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 http://sites.google.com/site/g4zfqradio/ensemble_mods
is a way to do this.
This shows the back, connection side, of a female plug.
Normal 9 pin COM port.
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.
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
http://sites.google.com/site/g4zfqradio/home Main Index page.
Setting up CFGSR for different versions of the Softrockhttp://sites.google.com/site/g4zfqradio/extio-or-cfgsr-some-notes
All aspects of the Softrock SDR a big page with lots of links but you should find answers to most questions. http://homepages.wightcable.net/~g4zfq/Si570.htm
1 The Si570
http://sites.google.com/site/g4zfqradio/soundcard_sdr_software 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.