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G8MNY > TECH 23.10.20 11:00l 54 Lines 1646 Bytes #999 (0) @ WW
BID : 10219_GB7CIP
Read: GUEST
Subj: 70cm 19el Tonna Yagi info
Path: IW8PGT<IZ3LSV<ED1ZAC<LU4ECL<GB7CIP
Sent: 201023/0857Z @:GB7CIP.#32.GBR.EURO #:10219 [Caterham Surrey GBR]
From: G8MNY@GB7CIP.#32.GBR.EURO
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 G0FTD @ 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 moulded 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 mould around block & fill in the hole you made
with a car repair resin.
Why Don't U send an interesting bul?
73 De John, G8MNY @ GB7CIP
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