[Antennas] 40m Antenna Ideas

2003年10月27日 12:25:36 -0600

Reminds me of the old Beer Can Vertical for 40, in QST 30-40 years ago
(back in the days of the old steel beer cans!), which were constructed by
soldering empty beer cans together for the required length. Never needed
to ask for help in building one!
Dave W9LYA
What wrought doG hath?
On 2003年10月27日 09:12:19 EST [email protected] writes:
> Greetings all,
>> At my home QTH, I have a 40/20 meter vertical which I constructed 
> from copper 
> pipe and which works quite well. 
>> It consists of a 4" X 4" 11' post sunk in the ground a couple of 
> feet which 
> has the antenna mounted to it with insulating standoffs. 
>> The radiating elements on 40 consist of ten foot sections of 1" + 
> 3/4" + 
> 1/2" + an additonal 2' of 1/2" - all copper pipe. The different 
> sizes are 
> connected together with threaded adapters for ease in erecting. The 
> bottom of the 
> 1" section has a threaded adapter which connents to a PVC threaded 
> adapter to 
> act as a base insulator. The 40 meter radiator is guyed at 20' with 
> some black 
> antenna cord from HRO to keep the thing from being bent in a strong 
> wind. 
>> The 20 meter antenna is connected in parallel with the 40 meter 
> radiator and 
> is 16' of 1/2" copper pipe held by standoffs to the 40 meter 
> radiator. 
>> Finally, there are 4 radials for 40 and 4 radials for 20 meters. 
> The 
> antennas are fed in parallel with RG-58 which has a balun coil wound 
> on the feed line 
> 32' from the feed point. 
>> The SWR is low on both bands and also on 15 meters. Only complaint 
> is 
> receiver overload on 40 meters due to the SW BC stations at night. 
> I have to use an 
> attenuator on 40 then to use efficiently.
>> Try it, you might like it!
>> 73,
>> Norm Hall, W6JOD
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