[ARC5] Antenna for small yard

[AKLDGUY .]

Please tell me how I'm supposed to fit a 33 foot antenna into a 24 foot
yard.

73 de Neil ZL1ANM


On Sat, Oct 22, 2016 at 11:26 AM, Mike Everette <radiocompass at yahoo.com>
wrote:

> Take a look at the article on converting and using ARC-5 and SCR-274N
> transmitters found in ARRL Handbooks from about 1960 through 1967 or 68.
>
> I think this was originally written by Lew McCoy, who had a great
> reputation for knowing what he was doing.
>
> It refers to use of 1/8 wavelength antennas, i.e. 33 feet for 80 meters
> and 16 feet for 40 meters.  The tips for matching and tuning are
> interesting.
>
> 73
>
> Mike
>
> WA4DLF
>
>
> ------------------------------
> *From:* J Mcvey via ARC5 <arc5 at mailman.qth.net>
> *To:* AKLDGUY . <neilb0627 at gmail.com>; ARC-5 List <arc5 at mailman.qth.net>
> *Sent:* Thursday, October 20, 2016 10:17 PM
> *Subject:* Re: [ARC5] Antenna for small yard
>
> Hello Neil,
>
> I was experimenting with the 40 meter Tx antenna in the spring to see what
> length it would tune to. I hoisted one end of the wire up in tree and
> hooked the other end to the TX
> It was amazing small, only about 23 feet (about one third the size of a
> half-wave), if memory serves.
> So, I suppose you would need about 46 feet for the 80 meter.
>
> I looked but couldn't find the right manual, but one of the ARC-5 or
> SCR-274 manuals has a whole description of recommended antennas in it.
> They used straight wire, L, and T types. The T is modeled like a vertical
> with a top load.
>
> A long wire will be HI-Z, which you may be able to match with cap to
> ground at the antenna terminal which makes a L section impedance match with
> the inductor.
>
> Dave Simson said that he could match 50 ohm systems with a series 50 pf
> cap.
>
>
> On Thursday, October 20, 2016 4:07 PM, AKLDGUY . <neilb0627 at gmail.com>
> wrote:
>
>
> Can anyone suggest a suitable antenna for 80m designed for low impedance
> transmitters such as the BC-230 and ARC-5?
>
> My yard is 24 feet (7.2m) x 12 feet (3.6m) with a 5 foot (1.5m) high
> wooden fence on three sides. The ground is covered with concrete pavers, so
> burying wires is not an option. I do not want to erect poles, so the fence
> will be the only support.
>
> I have a 2m J-pole mounted out on the fence with RG-213 coax dropping down
> and running across to the door. I figured that this might act as "the body"
> of a plane, so I disconnected the coax from my 2m transceiver and connected
> the braid to the Ground terminal of the BC-230.
>
> Then I ran out a wire from the BC-230 antenna terminal out to the fence
> very close to the J-pole. This wire was about 4 feet high, and I figured
> that the whole thing might approximate a short antenna above a plane body.
> Unfortunately, no antenna current was indicated on the BC-230's RF ammeter.
> It normally shows about 0.6 Amp when operated into a 5 ohm dummy load in
> series with 150pF (ARC-5 transmitter cap).
>
> Is anyone able to model that entire thing as an 80m antenna, or can anyone
> suggest a better arrangement?
>
> 73 de Neil ZL1ANM
>
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