Wolf's Motorhome Modifications

... and Other Stuff

Amateur Radio Antennas and Station


The Home Station and Why HF Is VERY Important

When my kids were little, I watched them a lot.  In fact, I worked a permanent midnight shift and babysat until my wife got home from work.  I would then sleep and work all night.  On top of my babysitting duties, I had days off that would rotate through the week.  One week I was off Monday and Tuesday.  The next I was off Tuesday and Wendsday, etc.  I had three day weekends.  It was a lot more fun watching the kids while we were camping than it was sitting at home.  I began to take the kids camping with me while the wife, with her Saturday and Sunday off, stayed home.

The wife is licensed.  In order to keep in touch, we began using packet radio to time-delay our messages.  HF operation while camping became very important.  In fact, I am writing this from the Canyon Country Campground near the Pennsylvania Grand Canyon after picking up messages from my wife (KA8ZVV) and daughter (KC8KQP).  Now that the kids are 15 and 16, they don't want to go camping anymore.  Now I have to keep in touch with them, too!

At home I operate a full MSYS software-based BBS.  It is fully linked and full forwarding.  At one time, before the Internet, I had over 300 regular users.

On HF, I have a scanning station that looks for people on various frequencies.  At the moment, it's scanning 20, 40 and 80 meters.  I have it set up to look for people on three frequencies on each band.  I have quite a number of Caribbean, Central and South American stations who use the HF port.


Antennas For Portable HF Operation

Many moons ago, I tried all kinds of antennas.  My friend, Mike, WA8BXN, stayed with a single configuration.  Mike ran a standard Hustler mast with standard Hustler radiators.  When he got to a campground, he would mount the antennas on the roof rack of his trailer.  I tried dipoles, longwires, a five band Hustler vertical.  In all cases, if my setup beat Mike's, it was only by a couple of S-units.  The plain, simple fact was his was easier to put up, take down and operate with.

Both HF Antennas and Mounts (55355 bytes)My first set of Hustler for portable used a mount permanently screwed around the top of my ladder.  It worked great and as expected I was able to get home from anywhere at any time (barring solar storms).  Over time it aged and became quite corroded.   The quick connect mounts often would loose continuity.

The current antenna set up involves three separate runs of RG-8x snaked back to a luggage compartment.  One is for HF mobile, one for HF portable and one for VHF/UHF portable.

HF Ladder Mount (22971 bytes)When I arrive, I pull out the Hustler HF mast with the coax already attached.   The mast terminates into a commercial clamp on mount that was modified by using a better bolt.  I attached one or three resonators (using the available Hustler adapter) and climb the ladder to screw the mount down.

My last motorhome had an aluminum roof.  I expected a dramatic loss of signal due to my current fiberglass roof.  No such loss was noted.  Most of my activity (and I work HF a lot when camping) is on 80 and 40.

Works great!  Stays corrosion free.


A Caveat

Please!  When someone on the newsgroups crabs that something doesn't work, ask him if he ever had one and used it.  Nine times out of ten you will find the old windbag has absolutely NO experience.  You'll know because if you ask if they ever tried it they will quote theory instead.


Antennas for HF Mobile

I have my Mobile Worked All States on 80 and 40 so please, don't preach to me about using Texas Bugcatchers or Screwdriver antennas.  I know they work great.  I just don't need them.  I would like to occasionally use them for talking, a general CQ once in a while, listening to short-wave and monitoring the CB band when traffic is backed up.  Oh, and for checking the BBS when I'm parked at Wal-Mart (poke-poke).

I currently use a through the wall mount of my own design.  The walls of a typical motorhome will only support a mobile antenna if you find and utilize a steel beam.   Rather than do that, I designed my mount to distribute the load of the antennas over a large area of wall and thereby provide a solid mount.

External view of HF mount (13909 bytes)Inside HF Mount (normally covered by coats) (13390 bytes)On the outside is a two by six treated piece of wood about eight inches long.  After cutting and drilling it for a Hustler stainless steel mobile mount, I primed and painted it with marine-grade paint.  I drilled four holes through the wall.  These came through in a closet where I used a piece of one by three lumber to distribute the load from he STAINLESS STEEL bolts, nuts and washers.  Again I used GOOP adhesive.   Take a cotton swab and swab GOOP into the holes to seal the walls of the holes BEFORE you put the bolts through.  Use some GOOP on the back of the two by six.

I picked up a ground from a nearby electrical socket.  (You say it won't work without a ground?  Can't prove that in real-life, here-it-is-and-it-works tests!   There is enough metal in the steel framing of the motorhome to provide the ground.   A young-looking/acting representative at the Dayton Hustler booth told me Hustlers wouldn't work on a motorhome!)

After all was set and I knew it worked by testing it, I literally painted the whole caboodle with GOOP.  This is not going to leak nor is it going to peel.

I set the antennas (15, 20, 40 and 80 meters) and used some nylon cord to provide a guy to the back.


Why So Low?

On my last motorhome, I had the same setup but had it mounted high.  I replaced four 80 meter resonators.  Campground trees, low wires, overhangs all do a number and loosen the metal where the whip goes into the resonator.  Mounting them high just isn't worth constantly changing the resonator.


Antennas for VHF/UHF Mobile

When I bought my current toad (a "toad" is a vehicle that is towed behind a motorhome) I decided upon a Saturn station wagon.  I needed the wagon for the Irish Wolfhound.  The Saturn can be towed four wheels down. The problem with the Saturn is that the thing is plastic.  The only metal in skin is the hood.

I bought it in October and didn't want to mess around punching a hole in the roof.   I was going to put a ground plane between the headliner and the roof and run antenna(s) from there.  I run 2, 1 1/4 and 3/4 meter mobile in all vehicles.   Instead, I picked up a Comet tri-band antenna and a Comet trunk lip mount.   The mount was put on the hood and I used that through the winter.

The car I traded was a Caravan.  I had drilled three quarter wave antennas into that roof and they worked very, very, very well.  I was quite surprised to find that my tri-bander on the Saturn worked nearly as well!  So well, in fact, that I bought one for the wife's car and the motorhome.

View of Triband Mount (15124 bytes)wxantin.gif (14655 bytes)Larsen makes a 3/4 inch angle bracket.  I used that bracket and drilled into a cabinet to conceal the wire and mounting bolts.  The bracket allowed the stress of the antenna to be distributed to a wide enough area.  On the inside I used some one-by-two pieces of wood to take the inside load and distribute it.

As always, I used a lot of GOOP.  Prior to mounting, I swabbed GOOP into all the holes to seal the inside of the hole.  I then sealed the entire assembly, inside and out, with GOOP.

Again, I know there's no ground.  Sorry, it works very, very well.  Must be working against the steel frame.  You do have a steel frame in your RV, right?


VHF/UHF Portable

With the advent of micro-miniature radios like the Yaesu VX-1R, the need for cross-band repeating becomes apparent.  I recently picked up a Diamond dual band single-piece base station antenna.  I am experimenting with attaching that to the third run of coax.  I have about 100 feet free so that I can locate and pull that antenna high into a tree or other structure.

In my last motorhome I had a dual-band Ringo mounted to a standard RV antenna lift mechanism.  WHAT A GREAT COMBINATION!  All I had to do was change the coax and crank the lift up.  It worked GREAT.  I might still do that in the new motorhome.


The Station

The station is built so that it can be carried from the motorhome to the shack at home and used there, too.  The "stack" as I call it consists of an AM/FM/Cassette on the top.  Below that is a Kenwood TM-731A dual band radio for 144 and 440 MHz.  An Icom IC-706 is used on HF.  More on that later.  A small, meterless MFJ antenna tuner allows me to run about any antenna I desire.  A Kenwood 220 radio is next followed by a KAM all-mode controller.

The Stack (64087 bytes)Below the radios in the same box are mounted five HIGH QUALITY three inch speakers.  Two are for the AM/FM/Cassette.  One is for HF, the fourth for 220 and the last for the dual bander.  Having the proper speakers makes mobile operation much more pleasant.

The radios are held in place by a piece of one inch by 1/8 aluminum stock bent back to the console.  A wing nut holds the radios to this retainer.

For Pactor, I use an older Radio Shack IBM/PC laptop, the 1500HD.  I have cables that allow that to be positioned at a lounge chair for ease of use when parked.  When mobile I sometimes use my Hewlett-Packard HP-100 palmtop computer.

When mobile, a Toshiba 440CDT sits atop the stack and is held with Velcro.  That is connected to power and the Tripmate GPS software to run DeLorme's Street Atlas, Map-N-Go or TopoUSA.  My Tripmate GPS receiver was mounted above the driver's seat inside of a front cabinet.   I found that by putting the receiver against the front and all the way against the outer fiberglass roof, I could maintain a green arrow even in dense forest.  With the ceiling carpeting or any other item in the way, it's effectiveness was diminished.

I installed a 12 foot nine conductor cable between where I have the GPS mounted and the computer.  By using DB-9s at both ends, I could leave that cable yet use the Tripmate in other places.


Power for the Station

Power comes from two sources.  First, and used most, eight gauge wire runs from the battery (where it is fused) to an outlet installed in the front of the motorhome.   Go DIRECTLY to the battery with this lead.  Sucking power out of any old 12 volt line could give you converter hum or a higher voltage than you would like your radio to see.

Two 12 volt and one 110 volt outlets (22177 bytes)My second power source is an Astron 35 amp power supply mounted in the basement.  Should the batteries be low, I can suck power out of the Astron.   Eight gauge stranded is again used to a second separate outlet.

The radio stack is fed by a extension cord made from eight gauge stranded.  I have a longer cord ready should moving the stack outside be necessary.

The gray 110 volt outlet visible in the photo is discussed on the "Winter Camping" page.

A note on the plugs I used.  I used plugs that look like this:  (-.-).   They are designed for 220 volt 15 amp service.  NOTHING in my life makes use of anything close to that plug.  Yet, it's easy to find.  I am PERFECTLY comfortable in its use.  If using a 220 volt plug for 12 volt DC bothers you, use something else.

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