[ARC5] Antenna for small yard

Sat Oct 22 00:48:47 EDT 2016

Start the antenna on one of the 12 ft sides. IT is OK to have a 90 degree bend (or two, if you want to center it on the 24 ft side).

Howie WB2AWQ

On 10/21/2016 4:49 PM, kgordon2006 wrote:
Droop the ends.

Sent via my Samsung Galaxy, an AT&T 4G LTE smartphone

-------- Original message --------
From: "AKLDGUY ." <neilb0627 at gmail.com><mailto:neilb0627 at gmail.com>
Date: 10/21/16 4:46 PM (GMT-08:00)
To: Mike Everette <radiocompass at yahoo.com><mailto:radiocompass at yahoo.com>, ARC-5 List <arc5 at mailman.qth.net><mailto:arc5 at mailman.qth.net>
Subject: Re: [ARC5] Antenna for small yard

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<mailto: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<mailto:arc5 at mailman.qth.net>>
To: AKLDGUY . <neilb0627 at gmail.com<mailto:neilb0627 at gmail.com>>; ARC-5 List <arc5 at mailman.qth.net<mailto: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<mailto: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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