<div dir="ltr">GW4BVE did a great job diagnosing why the DX Doubler at MW0EDX just would not work. All the issues were caused by low voltage output from a Startech PCI parallel card. Details below.<div><br><div><div><div class="gmail_signature">73,<div>Bob, N6TV</div></div></div><div class="gmail_quote">---------- Forwarded message ----------<br>From: <b class="gmail_sendername">John Clifford</b> <br>Date: Sun, Nov 9, 2014 at 5:29 AM<br>Subject: Fwd: M0EDX Wintest-DXDoubler Issues<br><div bgcolor="#FFFFFF" text="#000000"><br>
Hello again Bob<br>
<br>
Anton now has the DxDoubler interfaced to Wintest and working
correctly. He purchased a new parallel card which had more drive
voltage and that solved the problem. For your information these are
the card details:<br>
<br>
Old card<br>
Startech PEX1P. Logic high outputs are about 3.1v unterminated and
will not drive the DXDoubler.<br>
<br>
New card<br>
Sunix PAR6408A. Logic high outputs are about 4v unterminated and drive
the DxDoubler perfectly.<br>
<br>
Basically if the parallel card is using 3.3v logic levels the DxDoubler
will not work or at best be unreliable. This is due to the voltage
levels required to drive the HCF4049UBE chip used in the DxDoubler. <br>
<br>
All working now. Thanks for your help.<br>
<br>
73 John GW4BVE</div></div></div></div></div>