GMRS YAGI. By: Jeffrey Bail - N1BMX

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1 D GMRS YGI y: Jeffrey ail - NMX TOOLS NEEDED: - Measuring Device (Tape Ruler and/or Vernier Calipers) - Marking Device (Center punch and/or Marker) - Hacksaw (Or and Saw/Chop Saw) - Drill (Drill press prefered) - Drill its (#9[.6], #H[.66] 7/6"[.8] and /"[.750]) - #8- ottoming Tap W/ Tap Handle - ench Vise - (Optional) -/" ngle grinder for tuning* D C C Materials Needed: - 6in X" Sq luminum Tubing - 0in /8" (.75) Round luminum Rod - X #8- SS Screws - X 0.68(ID)X0.75"(OD) Shoulder Washers (McMaster Carr P/N: 9850) - X 0.75(ID)x0.65"(OD)Shoulder Washers (McMaster Carr P/N: 99070) - X 0.75(ID)X0.750"(OD) Round Spacer (McMaster Carr P/N: 9795) - + Ft RG-8 or etter COX - #8 Terminal Rings - X -Part Epoxy n easy to build element directional antenna that is designed to transmit on the GMRS band. This antenna can be used at home or in the field. - Continue to Page

2 D X [5.67].850 [00.99].50 [6.5] 5.50 [87.5] [06.0] [.70] D TOP VIEW (DRILL ONLY THIS SIDE) [.70] DRILL n.60 DRILL n.60 DRILL n.60 DRILL n [6.60] [6.60] [6.60] [6.60] [6.5].000 [5.0] SIDE VIEW (DRILL THROUGH OTH SIDES) C [5.67] DRILL n.8 DRILL n.750 [.] [.70] [.70] [9.05].850 [00.99] 5.50 [87.5] [.70] DRILL n.8 [.] OOM C X 6.0 [6.58].880 [7.5] DRILL n.60 FOR #8- TP - DO NOT DRILL THROUGH! [.06].50 [6.5] X 5.90 [.8] 0.80 [6.65].88 [.76].50 [6.5].88 [.76] n.75 [9.5] n.75 [9.5] REFLECTOR X X [.70].75 [9.5].88 [.78] [8.0] [.70] 6.00 [5.] Spacer - Mcmaster Carr P/N 9795 DRILL n.6 For #8- TP - DO NOT DRILL THROUGH! [.7] n.750 [9.05] n.75 [9.5] n.88 Or Ø.60 [.78] (Drill Through one Side) X Drill n.6 For #8- TP - DO NOT DRILL THROUGH! [.7] n.75 [9.5] n [.70] Shoulder Washer No Modification Needed Mc Master Carr P/N: [6.5].5 [.8] X n.75 [9.5] DRIVEN ELEMENT n.88 [.78] n.75 [9.5]. [.5] Shoulder Washer No Modification Needed McMaster Carr P/N: 9795 Instructions: - Cut the " Sq Tubing to 6" - Cut the /8" Rod to the following - pc.88" (or -7/8") - pc 0.8" (or 0-/8") - pc 6.0" - Using marking device locate and mark the parts you just cut using this print - Drill Holes nd/or TP using the sizes listed on print - Sand/Smooth any sharp edges DIRECTOR PLESE EXERCISE SFTEY ND CRE! See for detailed instructions See Page for ssembley PGE (Of )

3 D 7 ITEM QTY PRTS LIST PRT NUMER oom Element Insulator Screw Insulator Reflector Director Driven Insulator Driven Element 8-screw DESCRIPTION " SQ OOM Plastic Shoulder Washer Plastic Shoulder Washer /8" (.75) luminum Rod /8" (.75) luminum Rdd /" (.750) OD Plastic Spacer /8" (.75) luminum Rod #8- Stainless Machine Screws D.880 [7.5] 0.80 [6.65] C C 8 8 ssembly Instructions:.) Dry fit all the materials together. Make sure all the shoulder washers and plastic spacer fit through the hole. Then make sure the elements slide through the washers. Then screw in the elements and use a continuity tester to make sure there is no contact between the elements and the boom and also the two driven elements from each other. If something is touching the boom or both driven elements are touching then double check your setup..) If Dry Fit checks OK, Mix some two part epoxy (save some for later!) and use it to glue the shoulder washers to the boom. DO NOT GLUE THE DRIVEN ELEMENT SPCER! The screws will later hold the driven elements and spacers. wait for glue to set or cure.) fter the epoxy is set, assemble the antenna according to the print above. Slide the elements through the shoulder washers to line up the hole you drilled and tapped, then use a #8- Screw to secure the rod (Do not over tighten)..) Slide each half of the Driven element, hole first into the plastic spacer making sure the hole in the element lines up with the hole in the spacer, depending on the spacer used, you might have to hammer it in. 5.) Slide assembled driven element through the boom while making sure the hole line up to the ones on the boom. Then secure the the driven elements and plastic spacer using #8- Screws. These two screws are considerd your feed point. 6.) Test your antenna one more time to make sure there is no contact between the elements and the boom and the driven elements from the boom and each other. If it checks out, your antenna is ready for use 7.) Not shown is the feed line assembley. There are many ways to do this. Just make sure the shield of the coax is connected to one side of feed point and the center (core) is connected to the other. fter connection, test the end of the coax with your meter for any shorts. Test SWR and trim elements if necessary, Once.: SWR is obtained (or better) Use epoxy to seal everything. See for detailed information! - Special thanks to WEL for the help! DETIL SCLE : 8 DETIL SCLE : 7

4 For #8 Screw Size 0.75" 0.09" 0.65" 0.69" 0.05" 0 McMaster-Carr Supply Company Information in this drawing is provided for reference only. PRT NUMER 9850 White PTFE Unthreaded Shoulder Spacer with Flange

5 For /8" Screw Size 0.65" 0.060" 0.7" 0.80" 0.00" 0 McMaster-Carr Supply Company Information in this drawing is provided for reference only. PRT NUMER lack Hard Fiber Unthreaded Shoulder Spacer with Flange

6 For /8" Screw Size /" ±0.05 /" ± " ± McMaster-Carr Supply Company Information in this drawing is provided for reference only. PRT NUMER 9795 White Polypropylene Unthreaded Spacer

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