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G8MNY > TECH 16.03.03 17:45l 51 Lines 1597 Bytes #999 (0) @ WW
BID : 52266_GB7CIP
Read: DB0FHN GUEST OE7FMI
Subj: 70cm 19el Tonna Yagi info
Path: DB0FHN<DB0RGB<OK0PPL<RZ6HXA<IK1ZNW<GB7CRV<GB7CIP
Sent: 030316/1409Z @:GB7CIP.#32.GBR.EU #:52266 [Caterham] $:52266_GB7CIP
From: G8MNY@GB7CIP.#32.GBR.EU
To : TECH@WW
Length Measured
Element in mm Spacing
Reflector 350
Folded Dipole Not done
Director 1 330 Not done
Director 2 315 Not done
Director 3 305 Not done
Director 4 300 Not done
Director 5 297 Not done
Director 6 295 Not done
Director 7 295 Not done
Director 8 290 Not done
Director 9 285 Not done
Centre of boom
Director 10 285 171
Director 11 280 172
Director 12 280 173
Director 13 275 172
Director 14 275 172
Director 15 270 172
Director 16 270 172
Director 17 265 173
Quoted figures
Gain 17dBi
Aperture -3dB H 2x14ø
" V 2x16ø
Front-back 23dB
Side Lobes > 38dB
VSWR ò 1.2
Weight 1.1Kg
Length 3.2M
Wind load @ 25m/S 5.4Kg
73 de Andy @ GB7SXE.#38.GBR.EU
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Folded dipole spacing 2-3cm.
I have found a problems with Tonners of this construction, the ally-ally
connections inside the molded connection block. These corrode & you end up with
no aerial. Repairs can be done by sawing away at the block until the connection
rivet is located. Drill this out & drill & tap in a suitable brass screw after
first painting it with silver conductive paint on the screw & tapped hole. Make
a paper/tape mold around block & fill in the hole you made with a car repair
resin.
73 De John, G8MNY @ GB7CIP
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