HF Mobile

The rig is a Kenwood TS 480 SAT with the optional 500 hz CW filter installed.
I use a set of Bencher Paddles, just in front of the arm rest. They are vertical and can be moved from the back cup holder to the front cup holder. The arm rest slides front to make working CW more comfortable. 

The RF section is under the front seat. There is a matching transformer at the base of the HF antenna but the SWR gets a little too high on the band's edges. The auto tune keeps the rig from going into SWR protection. Under the TS 480's control head is mounted the control head for the TM 733A dual band  VHF/UHF radio. 
The control heads are mounted on a block of wood. The wood is pushed into the compartment that was used to store the CD's for the CD player. No holes were drilled in the car and it looks like it was made to fit. A pair of #12 wires run from the RF deck direct to the terminals on the battery. This line is fused at the battery connection.
 





The antenna is a dual band hybrid system which consists of the following:
 1" x 5' copper mast covered with black shrink tubing.
 
B&W Hy Q coil with a movable tap for 40 meters (7.180 mhz).
By moving the tap I can go anywhere in the 40 meter band or any frequency from 10 to 40 meters.
 
The whip on top of the coil is six feet long for a total antenna length of twelve feet which includes the coil form that is 1 foot long.
 
Under the 40 meter coil is a 20 meter resonator which is mounted at a 45 degree angle. The 20 meter resonator is a modified Hustler 80 meter resonator rewound to resonate on the 20 meter band. This resonator will now cover the entire 20 meter band with an SWR of less than 1.5 to 1. I have provided instructions, on the bottom of this web page, for modifying an 80 meter Hustler Resonator to work on 20 meters.
 
A matching transformer is located at the base of the antenna to provide a low SWR at the resonant frequencies of the two bands.


 

 

 

I always wanted to try 160 meters mobile. I put the Kenwood TS 480 SAT in the car and made a 160 meter resonator to fit on the mast shown in the picture. I have checked into the 1900 group (1900 khz) on Weds. evenings while driving home from the club's station. I have gotten favorable results. I am located in Bethlehe, PA and I was 20 DB over S9 into Maryland.
 
The coil is not a high Q coil. I used 1 ½" PVC and wound the coil using #18 enamel wire. This is not a very efficient system, but neither are most of the commercial mobile 160 meter antennas.
 
 If you would decide to build one of these coils, don't expect to go too far from its resonant frequency. The 2:1 bandwidth is in the order of 5 khz.
 
 
 
 
 
 
 
 
 
 
 

Shown to the right is the 160 meter coil. The actual coil length is 7 ½ inches long and wound with number 18 enamel wire. The coil form is 1 ½ inch PVC.

If you have a screw driver type antenna, this coil can be placed between the top whip and the top of the screw driver’s coil. By moving the adjustable coil on the antenna you should be able to work the entire 160 meter band.

 
 
 
 
 
Hustler Resonator modifing instructions:
First you must aquire a Hustler 80 mobile resonator Remove the shrink tubing and all of the enamel wire from the form. Rewind this form with 37 turns of 14 gauge enamel or bare wire. You can use 14 gauge THHN house wire if you don't have any emanel wire.Replace the shrink tubing and extend the whip to a length of 27 inches. Check the SWR, and adjust the whip for a resonant frequency near the center of the band. You should be able to cover most of the band with a very low SWR. Efficiency of the antenna system will be improved over the standard and the Hustler KW resonator..
 
Here is my original article that shows how to modify a Hustler Resonator titled, "Hop Up Your Hustler".  This article shows you how to, not only make the 20 meter resoantor, but also give the needed information on how to make a Hy Performance 15 meter resonator.