PreciseRF HG3 QRO 80m-30m MLA Manual Download Page 3

 

2.

 

See the figure below. The add-on radiation loop is connected in series with the existing radiation loop. 
Connect one end of the existing radiation loop to the 

left input

 (looking at the front) on the tuner case. 

Connect the other end to the six-inch SO239 extensions. Secure it with the supplied Adel clamp to the 
back of the tuner case using the existing bolt.  

Connect the two “L” SO239 connectors back

-to-back to 

form an offset. Connect one end of the add-

on loop to the output of the two “L” connectors. Connect 

the other end to the 

right input

 (looking at the front) of the tuner case.  

 

Figure 3 Routing the radiator 

3.

 

The radiation loop is made up of two turns. The loops are separated by two spacers. These spacers are 
placed at approximately the 90-degree and 270-degree positions on the loop. Use the supplied zip ties 
and affix them as shown below.  

 

Figure 4 Radiator loop spacers 

Summary of Contents for HG3 QRO 80m-30m MLA

Page 1: ...3 QRO 80 M 30M MLA OPTION The HG3 QRO 80m 30m is an add on kit to the HG3 QRO MLA It supplements the existing HG3 QRO 40m 10m system by adding a second turn to the radiator loop Roger Stenbock W1RMS S...

Page 2: ...9 extensions Two radiation loop spacers Two zip ties One Adel type clamp Arduino microprocessor with latest firmware Assembly The 80m 30m option adds an additional turn to the existing HG3 radiator lo...

Page 3: ...sing the existing bolt Connect the two L SO239 connectors back to back to form an offset Connect one end of the add on loop to the output of the two L connectors Connect the other end to the right inp...

Page 4: ...3 4 See below After all the components are installed dress the loops for a symmetrical appearance Now tighten the loop hanging brackets Figure 5 Loop centering...

Page 5: ...these values using the SET command once you have installed the Arduino with the new firmware You may need to open the controller case and replace the Arduino it is in a socket no soldering required 6...

Page 6: ...rn radiator A single turn radiator is somewhat unwieldly Also to achieve resonance on the lower portion of 80m requires a considerably longer loop than simply stretching out the two turn radiator That...

Page 7: ...data obtained in our lab The upper trace is return loss and lower trace is VSWR Note the narrow bandwidth and excellent VSWR While requiring more careful tuning it does provide significant noise redu...

Page 8: ...7 Figure 10 40 Meter Scan Figure 11 30 Meter Scan end...

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