DIMENSIONS can be found on each yagi page...
Please note that the element lengths shown in the elements table (bottom right hand image colour blue) must be doubled (x2) to give the correct overall length (end to end). Reason, YO7 only shows the elements half length. However, the yagi calculators on this website work out the actual lengths...DO NOT TUNE THESE YAGIS WITH YOUR VSWR METER ADJUSTING LENGTHS...USE ONLY THE EXACT DIMENSIONS SHOWN IN THE ELEMENTS TABLE!
Element Cutting Tolerances - Yagis have a frequency response that looks very much like that of a Low Pass Filter. Remarkably it is better therefore to cut 1mm too short than 1mm too long. Long elements can result in the cut-off frequency coming into the pass band.
When calculating the driven element length remember that the moulding establishes a center gap of 15mm which forms part of the total end to end length.
PARACLIPS are secured with a single screw/bolt...Recommend M4 Slotted Pan Head Screws (40mm)...Suggest wing nuts for easy portable operating deployment...First insert screw into ParAclip and then locate parasitic element, take to antenna...
Make sure that you slightly bevel the edges of the element rod ends so they are not sharp. When you push the elements in from the side of the clip be careful NOT to push the element into your hand, take it slowly. Use a dab of vaseline grease on the element end to act as lubricant, the clip is a VERY TIGHT FIT!...You could for example hold the parasitic element in a bench vice whilst you carry out this process...
Finally, some antennas (144 mhz - 9 and 11 ele) need bracing - a strut / bracket is provided but you will need to provide suitable bracing cord/string.
1. deassembly.doc
2. demoulding.jpg
3. tail.jpg
| Inch | 3/16 | 1/4 | 3/8 | 1/2 | 5/8 | 3/4 | 7/8 | 1 | 1 1/8 | 1 1/4 | 1 3/8 |
| mm | 4.76 | 6.35 | 9.53 | 12.7 | 15.88 | 19.05 | 22.23 | 25.4 | 28.58 | 31.75 | 34.93 |
FINALLY, IF IN DOUBT ASK!
73's and successful DX'ing from Richard Mason G6HKS and Derek Hilleard G4CQM
