|[AMRadio] open wire line (update)|
collinsradio at comcast.net
Tue Nov 20 10:55:27 EST 2007
I prefer dowel rod soaked in melted beeswax with a tablespoon of Jack
Dave, W3ST - W3CRA
Collins Radio Association
Join the largest Collins group in the world
Nets on 7208 at 4:30 EDST every day and
Monday at 3805 at 8 PM EDST
----- Original Message -----
From: "Geoff/W5OMR" <ars.w5omr at gmail.com>
To: "Discussion of AM Radio in the Amateur Service"
<amradio at mailman.qth.net>
Sent: Tuesday, November 20, 2007 10:50 AM
Subject: Re: [AMRadio] open wire line (update)
> Due to 'operator error' (must be a short circuit between the mic and the
> operators chair) I find I don't need to do anything to the current antenna
> situation, save for making sure the SWR bridge (out of the transmitter,
> into the tuner, out to balanced feed-line) is connected to the proper coax
> connection on the tuner (DOH!)
> (grab bow, slot an arrow, assume good balanced stance, aim, shoot arrow
> into foot) DOH!
> Yeah... I screwed up and connected the SWR bridge output to an antenna
> connection on the tuner, instead of the RF input connector (DOH!)
> (me and my dumb-ass! I wish hard living didn't come so easy to me!)
> Still mysterious as to why the feed line (disconnected from the tuner) and
> loop showed to be 'open', instead of closed, like it did this morning.
> So, I'll continue with plans to build the open wire feed-line.. I'm just
> not as pressed for time now as I was, prior to reviving the antenna
> I'm gonna go with either 1/8" or 1/16" plexi-glass, drill holes 1/4" in
> from the 4 1/2 plexi strips and 'v' a notch with a triangle-shaped small
> wood file.
> The wire I'll be using is 14ga stranded, insulated copper clad steel.
> Due to the size of the coax hole (through the wall, near the ceiling of
> the shack) that the 450 ohm ladder line barely fits through now, I'll
> leave about 5' feet of that on the tuner, and connect the 4" wide
> feed-line outside. There'll be a slight impedance bump, but nothing
> drastic or critical below 30Mc (I never get above 7.3Mc, anyway)
> Thanks to everyone for the suggestions.
> I'd like to extend an invitation to all AM'ers; look for activity on the
> bands late Wednesday evening. I'll be either at the bottom of 3700 (up to
> 3.725 - wherever there's a clear hole) or up around 3.880~90 operating
> while my traditional turkey smoking process is taking place, over night.
> If there's too many in any one particular round table, find a clear
> frequency and call CQ AM! With a cold front draping across the nation
> and dropping the temperatures in Texas (at least) down some 30+ degrees,
> long distance conditions -should- be favorable.
> Driving your AM Rig without a scope, is like driving your car at night,
> without headlights. (K4KYV)
> 73 = Best Regards,
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