FT-817 Portable Antenna and other tips
The Portable Antenna
I had experimented with several types of portable antennas for my 817 and had some success, however I wanted something "cheap and dirty" and particularly easy. I have a full set of Hustler resonators which I use in my mobile installation and those resonators sure looked like an easy solution to my problem. I do more listening than I do transmitting so I just wanted to be able to set something up without going to the hassle of 'stringing something up.' I use an LDG Z-11 tuner attached to the 817 so my setup is shown in the pictures. The same ideas can, however, be used with the single 817 although it will require some different type of machining. I will discuss how I attach the transceiver and tuner together later on in this piece.
The Hustler mast was, of course, out of the question for my portable station so I constructed a short mast for the purpose. The mast is made from a 19" piece of 1/2" PVC pipe. This particular length was nothing special, it just happened to be a piece which was not too long and not too short for my project and, best of all, it was available. This PVC is a thinner-walled version than some and is marked on the side, "CRESLINE PVC - SDR 13.5 - PVC 1120 - 315 PSI PR WATER at 73 degrees F --------- Drinking Water -- ASTM D 2241......" I'm really not sure what some of the numbers mean but it wasn't necessary for me to know.
When I built mine, I found a solder lug called a "Ring Terminal" which fit the 3/8" bolt and I used some #14 bus wire to run through the PVC pipe. I found it easiest to build the endcap/threaded bolt end first and solder the bus wire on the lug, then clamp on the endcap to the pipe leaving the long piece of wire sticking out the other end. The wire is threaded into the PL-259 piece as the coax plug is inserted (jammed) into the other end. Once everything looks correct, the bus wire can then be soldered onto the center pin of the plug with the excess wire snipped off.
The mast allows any of the Hustler resonators to be used for a portable antenna. With the PL-259 built into the bottom of the mast, a right-angle coax fitting can easily be screwed in and attached to the back SO-239 coax socket for the 817. One caution, however, but the mast/resonator is a long arm and if the transceiver is bumped or moved the whole thing swivels one way or the other and is no longer a vertical piece. I found it not uncommon for the mast to swivel and whack me or someone else close or to break something innocently sitting nearby. To alleviate this problem, I built the mast holder discussed below.
The No-Pull Power Adapter
The coaxial power jack seems to be one of the 817's weak points and numerous letters in the various Reflectors discuss problems other users had. I could see that this could cause a problem on my unit so I constructed a piece to firmly attach the coaxial power plug to the transceiver. It has worked superbly for me for many months.
The pictures above should pretty much tell the story. The small L-shaped bracket is built from 3/4" aluminum bracket material which is available from many hardware stores and usually comes in 6-foot sticks. It is available in various thickness' but this bracket is made from 1/16" stock. I cut mine to 1 1/4" width. The bracket is attached to the transceiver using the screw already conveniently located about 3/4" under the power jack. The hold-down piece I used was from the junkbox but almost anything would work to keep the power plug from wiggling around or coming out. It's a one-screw out operation if I want to remove the bracket.
The Mast Holder
I struggled over trying to find something to stabilize the mast for quite some time. What I finally decided upon was a U-shaped (square corners) aluminum piece which attached to the No-Pull Power Adapter bracket shown above.
Firmly tying the 817 and Z-11 together
I tried several things to tie together my FT-817 and a tuner. I had previously used an MFJ-901B Versa Tuner and it fit below the 817 perfectly, although it was thicker than my present Z-11 tuner. At that time I only used one strap and it was not quite as secure.
When I recently got my Z-11 I had to construct a smaller strap so I chose to try two instead of one and that has worked beautifully. The straps are made of 1" black webbing material which I found at the Army-Navy Surplus store. This store also carried several varieties of snap-together clamps and I chose the ones you see in the pictures. I did find a couple of clamps at the local Wal-Mart but I liked the size and selection I found at the Surplus store much better.
The straps each have 2 1/2" to 3 1/2" of overlap webbing material and where they overlapped, I used SuperGlue and a heavy-duty wooden carpentry clamp to apply pressure while the glue dried. With several straps I've built this way I have never had one even remotely look like it was trying to come loose. The determination of where to put the overlap to have a tight strap is done experimentally. My straps are built so that it takes quite a bit of "oooomph" to clamp them together but they hold the units securely with no movement. I place both my straps near the back of the pair so as not to cover the mike/earphone jacks or to cover the speaker grill.
Written Jan. 12, 2004