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                            AMATEUR RADIO - Mobile/Portable 

 

                                                     Mobile Ops Gallery.............                    
                                                 http://www.jerryclement.ca/HamRadio/HamRadio/

                                                                                                                                                                                                                                                                                                              

Having operated mobile with the majority of the gearmotor antennas available over the years, I have always been somewhat disappointed with these antennas due to the limitations of the mast size that the coil was mounted in, the larger the OD of the coil, the heavier the antenna.
 Giving thought to the problem, I came up with the idea for a design that utilizes a two diameter coil, the upper working section of the coil of any diameter desired, and the smaller tail section of the coil riding in the smaller OD mast housing, capable of supporting the working section of the coil along with included whip and caphat. This allows for an antenna that is much lighter in weight than the typical 10-80 meter gearmotor antenna with a 3"OD coil.

                                                   Antenna Werks Gallery..........

                                     http://www.jerryclement.ca/MachineShop/Antenna-Werks/


 The 10-80 meter antenna as seen here is proving to be what I have always wanted in a gearmotor antenna, an antenna design that does not limit the diameter of the coil that can be utilized in its construction. I built this antenna with a 3"OD coil, although the design allows for a larger diameter coil if desired. Still, the design is capable of using a much larger diameter coil with the same results. The antenna (mast assembly) as finished weighs in at 6 pounds (minus the whip and caphat) making it one of the lightest weight 10-80 meter gearmotor antennas around.


With the gearmotor antenna having been mounted on my mobile for the past four years, the antenna performs as I imagined that it could. This antenna with its one of a kind coil assembly is proving to be a very good design, and the 3"OD coil with the smaller 1 1/4"OD x 12" length tail section of the coil is wonderful to see in operation. The coil is rock solid with no side to side motion when extended in the 80 meter position, and will handle the biggest of whips with included caphat with ease.

 

                                                   


 

 

It goes without saying that the antenna that resides on your vehicle is only half of a successfully designed antenna system. In my case, my mobile has a body that sits on a frame that required bonding to eliminate noise and increase the ground-plane beneath my antenna. This in turn increased the performance of my overall antenna system. This also took a fair amount of time, and to accomplish this, I used 1 inch wide tinned copper flat braided ground straps with eyelets at either end to bond the various components of my mobile together. It is important that you use flat braided strapping and not round wire for bonding, as RF travels on the surface rather than through the wire, therefore flat braid has more current carrying capacity due to its larger flat surface.

It is important that you keep all of the ground straps as short as possible, and do take care when drilling holes in the body, so that you do not drill in-to any existing electrical harnesses that may not be visible. I used quality stainless steel fasteners along with stainless steel serrated washers for attaching the ground straps throughout my mobile.
So, don?t forget that your antenna is only one half of a dipole, and in the case of a mobile antenna, the missing half is the vehicle and its capacitance to the ground under the vehicle. The single biggest factor with respect to efficiency for any mobile and especially on 80 meters is ground loss, so maximizing this half of the antenna system is essential, and this is accomplished through bonding.

Mobile Radio Stack

As you can see, I have it covered when it comes to navigation with my mobile, as I am running three different mapping devices, that consist of from left to right, my Garmin Nuvi running City Navigator mapping with a built in FM traffic transceiver, that keeps me up to date as to the happenings on all controlled highways, as well as reading out all up coming roadways, safety cameras, and the posted speed on any controlled roadways.

My Garmin Montana is next in line to the right, and I have it paired with the SCS Tracker located just beneath it. The SCS Tracker is a HF APRS Robust Packet TNC that is paired with the Kenwood TS-480HX and listening on the top end of the 30 meter band, the band used for HF APRS across the world. Once the SCS Tracker has decoded packets that it is hearing via the TS-480HX, the tracker then sends this information to the Garmin Montana where the beaconing HF stations are placed on the map as seen in this photo. The SCS Tracker is proving to be a superb TNC that keeps me connected with the APRS network from anywhere I may travel while mobile. I also run APRSIS/32 on my netbook in conjunction with the SCS Tracker allowing me to keyboard message with HF APRS Stations located across across North America.

The device on the far right, is my Kenwood AvMap Geosat 6, that is also used for displaying beaconing VHF stations on the map, and I enjoy the fact that it runs in portrait mode. Again, I have it covered in spades, when it comes to mapping for the roads I am going down, and as to what is happening around my location at any time.

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           Although I enjoy going mobile immensely, I also enjoy working portable with the manpack that I built and carry in my mobile, and on occasion I will head down the trail with this setup. 

                                                                          Portable Ops Gallery................      http://www.jerryclement.ca/HamRadio/VE6AB-Portable-OPS/

                                                                       JERRY'S JOURNAL is about all things ham radio, check it out...............   http://ve6ab.blogspot.ca/

 

8661808 Last modified: 2018-02-19 14:02:10, 10150 bytes

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QRZ Logbook Summary for - VE6AB
Latest Contacts for VE6AB at QRZ.com
dedateband mode grid Country op
W2ZZA 2012-07-14 2m FM FN02pu United States David H Halik
K0MCM 2012-02-12 17m USB EN13pm United States Brian E Ward
VA6BDJ 2012-01-24 2m FM DN39qk Canada Nancy Orr
G1XOW 2011-11-13 10m SSB io93ma England Steve
ZS6CX 2011-10-23 10m SSB KG43ct South Africa Glen Mathew Marshall
VA2LS 2011-07-24 80m SSB FN36xa Canada Serge Lebel
KD7AAT 2011-07-03 2m FM DN17gq United States JOHN P MYERS, JR
W7TX 2011-06-24 17m SSB DN32su United States David E Rakos
KF7MYK 2011-06-09 2m FM DM09ff United States Kevin S Deane
KD7AAT 2011-06-07 2m FM DN17gq United States JOHN P MYERS, JR
VA6TSS 2010-09-20 2m FM FN04jm Canada Tammy Scheirman
VA6MKS 2010-09-20 2m FM DN39nk Canada Melanie Still (+)
ON6DP 2010-08-21 20m RTTY JO20sm Belgium PAUL DELMELLE
YD7JON 2010-07-13 40m AM OI76hm Indonesia YUDDI PRIHANDOKO,SH
KI6PMD 2010-07-08 2m FM DM04vc United States Philip S Percival

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