Mobile install

By Toshen, KEØFHS
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Kenwood TM-V71A Dual-Band Radio
Kenwood TM-V71A

1) A bit of a long, strange trip

I'm not much of a car guy, so I'm pretty satisfied with—and surprised by—how well the installation of the Kenwood TM-V71A into my 2015 Subaru Forester turned out. It was a bit of long, strange trip to get to this point.

1a) You call that professional?

In fact, I had intended to have the radio installed professionally, but apparently the universe didn't want that to happen. My regular car mechanic shop wasn't interested in the job, so I thought about using a local branch of a car stereo installation chain shop, but the online reviews they have received are so awful that I was scared away.

Finally, I found a high-end custom car audio installation shop that had good reviews and told me by phone that they were willing to do a ham radio installation and had experience doing them, so I went in to talk to them about it. It was a bit of a drive to get to them and their charge was definitely on the pricey side, but I figured it would be worth it for a job done professionally, so I made an appointment for two weeks later.

On the morning of the appointment, I drove my car there again, and a friend drove there as well, to give me a ride home. We arrived on time for the appointment, and then waited and waited, but nobody showed up to open the shop, and nobody called or texted me to explain why they were so late. After a long, boring time, I decided that it probably wasn't a good idea to have my radio installed by a shop that would treat a customer that way, so we left.

1b) Many sweaty hours

I wasn't sure what to do next, but when I asked a local Elmer if he could recommend an installer, he convinced me I should try to do it myself.

It took me a lot of hours and sweat spread out over three days, and I ended up with scrapes and cuts all over my hands, and with my body bruised and feeling as sore as when I take a long, steep hike up in the mountains. I'll also confess that I cussed at the people who design cars more than a few times. But I got the job done, and in the end I'm glad I did it myself.

2) Mounting the front panel and speaker

The radio's front panel and the companion KES-3S speaker fit nicely into the cubby hole in the Forester 2.5i's center console. I hung the front panel from the top of the cubby using the DFK-3D remote kit, and I mounted the speaker to the floor of the cubby using the bracket that came with it.

The microphone hanger fits nicely into an indentation on the outside passenger side of the console, which is perhaps a spot designed for an additional speaker in an upgraded version of this car. Kudos to Kenwood for providing a quality mic hanger with this radio, which holds the mic firmly in place.

Kenwood TM-V71A front panel and KES-3S speaker mounted in the cubby hole

By the way, using the KES-3S external speaker really improves the sound quality, not to mention letting you put the speaker where you need it (rather than, for example, under the seat where the radio's main body ended up). In my shop I use the same model radio for my base station, and also use KES-3S speakers mounted up high with that, which provide crisp, clear audio with good volume that I can hear throughout the shop.

2a) Running the radio wiring

I was able to gain access to some hollow space in the center console by popping off the two plastic gray pillars at the front of the cubby hole, which then enabled me to pop up the black plastic cover surrounding the shifter assembly.

I drilled a hole through the inner plastic wall toward the rear of the cubby (thank goodness for right-angle drills), popped a rubber grommet into it for cushioning, and then ran all the cables—front panel and speaker, as well as the microphone extension cord that came in the PG-5F kit—through it and down into the space surrounding the shifter assembly. (Later, I ran the power cable, which you can see on top of the other cables, through this same space.)

All the cables running through the center console around the shifter assembly

2b) Mounting the radio's main body

I mounted the radio's main body under the passenger seat by hanging it from a steel bar that runs between the seat runners (I'm guessing that bar might be there for mounting the motor that controls seat movement on models with power seats).

Kenwood TM-V71A main body mounted under the passenger seat

There are two openings in the carpet beneath the seat that give access to some mounting bolts (not sure what they're for). I was able to run a wire puller from the center console into one of those openings in order to pull the cables beneath the carpeting and up into the center console. (Sounds easy, but that step took a long time and a fair bit of sweat!)

Here's the view of the radio's main body from the rear seat. I glued the ferrite choke that's attached to the cable that runs to the front panel onto the radio's main body in order to prevent the cable from getting accidentally snagged by a passenger's foot.

View of the Kenwood TM-V71A main body from the rear seat

2c) Running the power cable

The power cable attaches directly to the car battery and then runs through the engine compartment and into the passenger compartment. I wrapped the exposed wires with wire sleeve (aka: split wire loom or convoluted tubing) that I picked up in the automotive section of our local hardware store, and then secured it all with zip ties in a way that keeps it away from any hot parts of the engine.

View of the power cable running through the engine compartment

I ran the power cable into the passenger compartment through an unused diamond-shaped rubber grommet labeled LH that covers an opening in the bulkhead where, for a manual transmission model of this car, the clutch master cylinder would be mounted. I sealed the slit I made with GOOP.

View of the power cable running through the bulkhead

That opening enters the passenger compartment just above the gas pedal assembly. I ran the cable from there to behind the carpet that is mounted up onto the center console, and then into the center console. From there, it joins the other cables that run under the carpet on the other side of the center console and to the radio's main body.

3) Installing the antenna

I mounted a 40″ Comet-NCG CA-2x4SR antenna (with spring) to the passenger side of the rear hatch with the Comet-NCG RS-730 mount.

Comet-NCG CA-2x4SR antenna mounted on rear hatch

This is the one thing I'd do differently next time. I think it would've been better to mount the antenna on the driver side of the car where it would be in the middle of the roadway, as I've already hit a few branches overhanging the passenger side of the road. Live and learn!

I think what I'll do to solve this is to install the shorter 27″ Comet-NCG SS-680SB antenna for normal day-to-day use, and reserve the CA-2x4SR antenna for times when I need stronger and wider coverage.

3a) Running the antenna cable

This was another step that took a long time and a lot of sweat!

I ran the CK-3M5 antenna cable into the roof space through a slit I cut into the the center brake light cable boot (again, resealed with GOOP).

Antenna cable running into the rubber cable boot

From there, I ran the cable down the pillar behind the rear window and along the side panel to beneath the rear seat. Then I ran the cable through the frame beneath the kick plate for the rear passenger door and into the floor space next to the center pillar.

Finally, I brought the cable up into the open space beneath the front passenger seat just in front of where the rear of the seat runner is bolted to the floor, where there is an opening in the carpet.

3b) Antenna mount do over!

A couple weeks later: Well, after knocking the longer antenna on low-hanging tree branches a few more times, I went ahead and installed the shorter antenna. But after knocking even that shorter one on roadside branches several times, which can make a fairly shocking sound, I decided I simply had to bite the bullet and fix my mistake.

Fortunately, there was some excess antenna cable under the rear seat, and I was able to pull that back to the rear of the car fairly easily. I cut the GOOP seal on the cable boot and pulled the cable through. There was just enough extra length so that I could mount the antenna down a bit lower on the driver-side of the rear hatch. Should be good now!

4) Compensating for my suspect memory

Because the radio is connected directly to the car battery, the radio can be on when the car is off. After using the radio for a couple of weeks, I realized that I was a bit nervous at the prospect of forgetting to turn it off when I turn the car off, possibly causing the battery to completely drain. Fortunately, while researching APRS I came across a product made by APRS World called APO3 (Automatic Power Off 3), which does just what its name implies: shuts off the power to the radio after the car is turned off.

APRS World APO3 unit with OEM radio connectors

The device has a variety of settings for how long after the car is shut off that it shuts the power to the radio off. The default is ten minutes—in order to give the radio enough time to send one final update if APRS positioning is enabled—and that works fine for me. It even has an override switch to enable using the radio when the car is off.

The black box is small enough that I was able to put it under the seat right next to the radio itself, mounted via a scrap piece of pine to the same steel bar, so everything remains up off the floor and tidy.

Mounted APRS World APO3 unit

Because I was working under the seat in an area that was even more confined because of the radio body that was already there, mounting it was a royal pain, but with enough time and fumbling around I was able to get it securely attached. I also went ahead and wrapped all the cables with wire sleeves just to give them an added bit of protection.

By the way, I've since learned that Powerwerx makes a similar product: DC Automatic Power Switch/Timer, and it has the advantage of being waterproof and mountable in the engine compartment.



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