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at the same distance from where they enter the vehicle. If the chokes are staggered, common mode will transfer 
from one of the RF hot cables to the other. 
 
 

Antenna Wiring Color Code 

With the yellow wire positive and the green wire negative the antenna coil will travel downwards going towards 
the 10 meter band. With the green wire positive and the yellow wire negative the antenna coil will travel 
upwards towards 80 meter band. 
With the control box in your hand and the cable towards your body, pushing the top of the rocker switch the 
antenna coil should go up; this is going towards the 80 meter band! If the antenna goes the opposite direction 
the connection of the yellow and green wire should be reversed. If the Antenna goes the opposite direction then 
the connection of the yellow and green wire must be exchanged.   
 

Warning: Do not apply DC voltage across the brown and white wires you will damage the reed 
switch. 

The brown and white wires go to a Normally Open reed switch that closes two times per revolution of the motor 
coupling. This reed switch is compatible with all currently manufactured controllers which require a switch 
closure to return a voltage pulse to the controller that will update a digital display.  

 

If the Brown and White wires are not used, DO NOT CONNECT THEM TO THE BODY OF THE ANTENNA! 
RF coupling to these wires by close proximity of the RF HOT Stainless tube is not an issue. 
 
Connection of these wires to the RF HOT Stainless tube or antenna body will transmit either 100 watts or 500 
watts if an amp is used, into the reed switch with severe RF CURRENT coupling to the Motor. 
 
IF YOU CONNECT THE BROWN & WHITE WIRES TO THE BODY OF THE 
ANTENNA , YOU WILL VOID YOUR WARRANTY! 

 

 

 
Installing and Tuning the Antenna Matching Coil 

Your 

Scorpion

 antenna comes supplied with a base matching coil, sometimes 

referred to as a shunt coil. The shunt coil is almost invisible from the 20 meter 
band and higher frequencies. 
 The photo at right shows the proper mounting location of the shunt coil on the 
antenna. The shunt coil transforms the input impedance closer to 50 ohms to match 
that of the transceiver. Since the input impedance varies with each installation, the 
inductance of the coil might have to be adjusted. This is done by changing its 
overall length a small amount. 
 
 

Adjusting the Shunt Coil using an SWR meter “80 

meter antennas only” 

With the shunt coil as is…the Micro Henry value will be at its maximum. This will give you a lower SWR on 
the low bands such as 75/80 meters.  

Do a test with the shunt coil on the 40 and 80 meter bands before adjusting the coil. 

 

If you have high SWR on 40 meters and your 80 meter band has a low SWR…try spreading the shunt coil apart 
a little “VERY LITTLE” then retest. You will notice that the SWR at 40 meters will 

decrease

 a small amount 

or a lot depending on how much you spread the shunt coil, and the 80 meter SWR will

 increase

 a small amount. 

 

Summary of Contents for SA- 680

Page 1: ...Scorpion Installation Manual ...

Page 2: ...s dense and heavy Our finger stock and coil support housing is polished 6061 T6 Aluminum It houses the tin plated finger stock and a one inch wide phenolic coil support The housing also works as a heat sink during high power operation The finger stock is very expensive special order tin plated Beryllium Copper that maintains 37 pounds of combined pressure on the coil at all times Our antenna coil ...

Page 3: ... covered under warranty 1 Remove the packing tape from both ends of the shipping tube 2 There are 15 Phillips head wood screws safely holding the antenna in the shipping tube Eight at the bottom of the tube 3 in the middle of the tube and 4 at the top of the tube All were located under the packing tape that you just removed Please remove all of these screws 3 Using two of the removed screws partly...

Page 4: ...ctions Antenna Installing Tips Your Scorpion antenna is manufactured to an exacting standard utilizing top quality components Its inherent high Q means you ll get the best performance money can buy However any HF mobile antenna is only as good as its installation What follows are a few things to keep in mind when choosing where and how to mount your Scorpion antenna Please go to Breedlove mounts J...

Page 5: ...ecially on the 40 or 80 meter bands A ground strap will have to installed between the base of the antenna using one of the 8 button head bolts at the base of the antenna and the body frame structure At a minimum this should be tinned copper braid 3 4 inches wide The use of solid copper flat stock that is 010 to 030 inch thick and 1 inch wide will actually work better due to RF skin effects Remembe...

Page 6: ...radiating part of the antenna By doing so we also help to stop common mode from migrating into the cab of the vehicle This is accomplished by installing the two supplied 31 type clamp on chokes These chokes are ample for 100 watts of power Additional chokes will be needed if higher RF power is used Install one of the two supplied 3 4 inch ID 31 type material clamp type chokes on the coax and one o...

Page 7: ...e proximity of the RF HOT Stainless tube is not an issue Connection of these wires to the RF HOT Stainless tube or antenna body will transmit either 100 watts or 500 watts if an amp is used into the reed switch with severe RF CURRENT coupling to the Motor IF YOU CONNECT THE BROWN WHITE WIRES TO THE BODY OF THE ANTENNA YOU WILL VOID YOUR WARRANTY Installing and Tuning the Antenna Matching Coil Your...

Page 8: ...ual shunt coil relay is located at the bottom of the enclosure There are two locations on the antenna that you can mount the dual shunt enclosure As seen in the photos the small button head screw above the white Delrin insulator is a 10 32 thread and the button head below the white Delrin insulator is a 20 There are three locations for 10 32 button head screws they are 120 degrees apart from each ...

Page 9: ... for permanent installations this 1 amp fused connection is required by the customer to be made to a power source other than the accessory socket On the top of the 160 meter antenna control box is the 80 160 meter switch When operating on 80 meters the switch must be switched to the 80 meter position When operating on 160 meters the switch must be switched to the 160 meter position WARNING Do not ...

Page 10: ...nd Any band higher will require a 6 ft whip Any screwdriver antenna will perform better on the 40 80 or on the 160 meter band with a 102 inch whip Most people do not like a long whip that tall so we recommend using a capacitance hat of at least 36 inches in diameter The capacitance hat has to be installed a minimum of 24 inches above these large coils 36 inches is better still The antennas efficie...

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