ZS1JHG Multiband Longwire

66 feet (20.12m) of insulated wire about 1/1.5 mm diam.

Connect 66 ft long wire to a 4.1 Balun and then use a short length of coaxto Transceiver.The Counterpoises are connected directly to the 4.1 Balun. Do not use a ground earth.

Tested using a 4.1 Moxon voltage Balun and an MFJ 259B SWR Analyser

Freq C/poise SWR SWR R XMhz length 50ohm 75ohm

coax coax

7050 32.7ft 10m 2.3 1.7 133 0

14200 17ft 5.2m 1.1 1.4 54 0

21200 9.8ft 3m 1.2 1.3 56 0

28500 5.9ft 1.8m 1 1.5 49 3***

Notes

To obtain a lower SWR on 7.050 use RG59 (75ohm) coax to connect to TXOn other bands RG58 ( 50ohm) must be used.*** Calculated SWR using RG59 coax on all bands

from TLW program by Dean Straw QST Tech editorThe counterpoises must run away from the TX operating position to minimisecapacitive coupling with the operator. Note these are hot with RF so ensuresuitable insulation at ends of counterpoises.

The counterpoises can consist of one length of 17 ft , 9.8 ft and 5.9 ft.Joining these all together with suitable couplers will give 32.7 ft

66 ftC/Poise

4.1 balun

coax 50 ohm(for 40m coax 75 ohm)