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Call Sign : 26-CT-4345 / M5WJF Posts : 144 Times Thanked : 10 Join date : 2021-11-19 QTH or Location : Shrewsbury IO82OQ Equipment Used : Albrecht AE-5890EU / Yaesu FT-847 + SGC-235/Dipole + V2000 + 4m Folded Dipole, Yaesu FT-100D + ATAS-120A, HF Transceiver? + Butternut HF-9V, Yaesu FT-8800R + 2/70 Whip, then Yaesu FT-90 / FT-727 and other stuff Age : 56
Subject: Inverted-V Portable CB... Wed Dec 08, 2021 8:06 pm
OK, thinking about this.
With a 26ft telescopic mast with a drive on base support, using a 90 degree Inverted-V for DX, and calculating ~3.5% shorter legs for a target centre frequency of ~27.478 MHz, this would mean two legs of wire 5.264 metres using RG213 coax and a Dipole Centre Balun, which would need rope + egg insulators extending ~5.94 metres each leg to ground posts.
This would mean that the ends of each leg would be suspended 4.2 metres / 13ft 9in AGL, so meets EMC for 12 Watts SSB, and is well out of reach for Electrical Safety.
Anyone see any problems with this as a plan for DX Portable?
Sounds better than the one I once knocked up. I made one with a square slap of timber and two plastic garden canes bolted through, and a piece of plastic drain pipe for mounting. I set it up outside the caravan I was staying in Scotland. Right by a lochside, set it up just a metre off the ground tied to a fence post. I had pile ups every morning.
I did consider the slightly cheaper 17ft Telescopic Mast, but losing 9ft in height this brings the ends of each antenna leg down to 4 ft 9 in (1.45 metres) AGL, and obviously someone could end up touching these.
Anyway, there's only £10 difference in a new Telescopic Mast of 17ft or 26ft, so it's a no brainer.