This webpage will discuss setting up a dual-receiver system using Linrad as software for a SDR
   (Software Defined radio) providine Adaptive Polarity Reception.
 
   Specifically, the EME receiver is an Elecraft K3 with KRX3 sub-receiver option, fed by a dual-channel
   transverter converting 144-MHz to 28-MHz.  The first IF (8.215-MHz) is tapped from both the Main
   and sub receivers of the K3 to drive two Telepost, Inc. LP-Pan SDR.  The LP-Pan convert the IF 
   into two quadrature baseband audio outputs which are input to a M-Audio Delta-44 soundcard which 
   produces two I/Q data streams for use by Linrad.
 
   References:
   LINRAD Homepage
   LP-Pan SDR Panadaptor
   LP-Pan Manual 6.7 Mb pdf.
   Delta-44 Manual 1.5 Mb pdf.
   Elecraft K3 webpage
 
   Here is the presentation given at the 2011 Pacific NW VHF Society Conference in Bend;
   Adaptive Reception of Dual-Polarity EME signals Using Linrad (1.8 Mb pdf)   
 
    
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
   INSTALLING LINRAD:
 
   The following is for installing Linrad under Windows XP, Vista, or Seven (only).  
   If you wish to download for other OS like win95, win98, win2000, or Linux go the the Linrad 
   Homepage for instructions.  They will not be covered below:

Go to the Linrad Homepage link shown at the top of this page and read the procedures for downloading Linrad, then:
Download the installer: setup-linrad-03.19.exe (681341 bytes)
Run the installer and use the default folder which is C:\Program Files\Linrad\Linrad-3.19
Download the Libraries and Binaries: setup-linrad-dll-package-01.exe (614050 bytes)
Save the setup-linrad-dll-package-01.exe in: C:\Windows\System32
Find and run the setup-linrad executable file just downloaded
close all and launch Linrad from the shortcut on the desktop
   To be continued.
 
   INSTALLING the EMU-0202 Soundcard:
 
   Follow the instructions given by Emu manual found in the emu CD:

Connect the emu-0202 to the computer with a USB2.0 cable
Turn-on power with right-most knob; green power lamp indicates
Insert Software CD which should auto-start under XP
Cancel the new hardware detected dialog page if it pops up
Select the emu-0202 and open the owner's manual
Follow the installation instructions and restart the computer when finished
 
   Connecting K3, LP-Pan, and EMU-0202:
 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   Front Panel of the emu-0202
 
   Note: this configuration is for testing the K3 and the LP-Pan with the emu-0202
   soundcard and can be used for panadaptor use on HF/6m with the K3.  It is not the
   configuration planned for use with Linrad.

Connect cables to LP-Pan output from the emu Inputs using two 1/4 to 1/8 inch mono phone connector cables
Ensure that you connect I and Q cables correctly: I=Left,Q=Right
Connect computer speakers to the 1/8-inch stereo phone jack (Output)
Connect LP-Pan to K3 IF output (BNC cable).
Adjust the Left & Right level adjust controls to "11-o'clock" position
Press the Direct Monitor Button so the stereo lamp indicates green
Computer sounds should be heard now
Turn on the K3 power and tune onto an active band
Launch emu control panel from the shortcut icon on the computer screen
Chose a sample rate = 96 KHz
You can hear radio audio in the speakers by increasing the Direct Monitor Level higher
The emu manual instructs to adjust Line Levels so "-12" green lamps just flicker but this raises the noise floor too high
Radio audio is also available for head phones plugged into the emu
Reset Line Levels to "11-o'clock" for spectrum display
Panadaptor software will need to be installed for display of spectrum
 
   Example of display using Spectravue software, K3 on 14.285 MHz, with 90-KHz span.  Note
   That the noise floor is about -82 dBm with the emu Line Levels set to "11".  Spectravue was
   set up with soundcard input with FFT=16 kbps and RBW=5.9 Hz; mild smoothing=2 and scale= 2dB.
   Display will depend on the spectrum software that is run.
 
   Connecting K3 Sub-Receiver IF to LP-Pan:
 
   The K3 provides IF output for the main receiver but not for the sub-receiver (KRX-3).
   This shows how to modify the K3 to provide IF output for the sub-receiver.  IF output
   can be obtained by connecting a coax line to the p86A terminal at the output of the
   first mixer at jumper "w-3".  This is also pin-1 of J78, the noise blanker connector.
   Refer to schematic of the KRX-3 shown below (refer to upper right corner for the 
   location for making connection).  A small .001 uF disc. ceramic capacitor blocks +8.5vdc
   present at p86A. It is soldered at the eyelet adjacent to w-3 and J78, pin-1.
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

Strip an eight inch piece of Belden 7805 RF100 RG-174 coax cable and remove about 3/4-inch of the jacket.
Comb out the braided shield and twist to make a tight ground conductor.
  
Slip some heat-shrink tubing over the twisted shield so 1/4 inch is exposed.
trim one lead of a small .001 uF disc. cer. capacitor to 1/4 inch, bend one lead and insert 1/8-inch in the hole adjacent to "w-3"
connect the other lead of the capacitor to the center conductor of the coax, after two ferrite beads are slid onto
the foil shield of the center conductor; 3/8 inch of the coax should extend beyond the beads.
 
strip 3/16 inch of the coax and solder to the unconnected capacitor lead.
  
Solder the coax shield "wire" to the tinned metal shield of the KRX3.
Solder it down at the junction of the KRX-3 pc board so the KRX-3 cover can still seat without interference.
reinstall the noise blanker pc board.
 
Route the coax cable up thru the largest hole in the metal KRX-3 cover, install the sub-receiver cover.
Once the KRX3 cover is secured, run the coas thru a small toroid winding the coax thru twice.
The other end of the coax will be connected to a BNC female connector inserted into the hole reserved for the XV144 antenna.
Connect one of the LP-Pan to the sub-receiver IF BNC connector.
   
 
 
 
 
 
 
 
 
 
 
   Modifying LP-Pan to run on a Master Oscillator:
 
   For the LP-Pan to be in phase, the units are run from one master clock.  The 32.836 MHz xtal oscillator
   in one of the units was chosen as the master, and the ocillator in the other unit disabled.  Clock lines 
   from U11 (ADCMP600) were cut in both LP-Pan.  A capacitive divider was installed on the master unit and fed
   to the slave unit via coax jumper.  I had to add a mmic amplifier (MAR-4 to compensate for loading).  The 
   clock signal needs to be >2.2 Vpk-pk for the IQ-switch to work correctly.  The MAR-4 loads down the output
   of U11 to 1.5 Vpk-pk but its gain boosts it to over 2.5 Vpk-pk which is enough to drive both LP-Pan.  
   LP-Pan Schematic from their website. 
 
   
 
 
 
 
 
 
 
 
 

 
 
 
 
 
 
 
 
 
 
   
   INSTALLING the DELTA-44 Soundcard:

Insert Driver CD which should auto-start under XP
Follow directions from the CD
Ignore "Windows Logo Testing" warning - Press continue
Select "Yes, I want to shut down computer" and click "Finish"
Disconnect power and other cables on the computer
Open the computer case
Observe static electricity discharge procedures
Insert the Delta-44 PCI Card into an unused PCI slot
Close the computer case
Connect sub-D15 cable to the newly installed card connector and to the External Breakout Box
Reconnect other computer cables
Turn on computer
XP will display "Found new hardware" Wizard
If running Vista or Seven the install is done - disregard the following steps
Chose "Install software automatically" and click "Next"
When install is done click "Finish"
You should see "New hardware installed and ready to use"
There should be a new icon in the Start Menu
   
   MAP65 version2:

   In 2012 Joe Taylor, K1JT, released a new version of MAP65 which could accept baseband audio directly and
   bypassing the need to run Linrad.  I have downloaded and gotten MAP65v2.3 running on my dual-polarity
   diversity station.  Go to MAP65 For details. (site under construction)

 
 
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