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I put this on the reflector just in case someone else has the same question: I thinked we e-mail before on this topic as I was planning on getting the switch box. Here is the scoop. The switchbox is a large grey plastic box about the size of a cigar box but a little narrower. Inside are 2 inductors and one relay. One inductor is for the center of your coax and the other is for the shield. The inductors (coil of wire) make the antennae longer thus lowering the antennae SWR. Energizing the relay shorts out the inductor, makes the antennae shorter, thus puts you on SSB. The antennae linear loading tuning wires are tuned for SSB with the relay energized say for freq 7.220. Turn the relay off puts the 2 inductors in line and then spread or compress the inductors to get the antennae SWR for freq 7.040. That's right - tune antennae for SSB with relay on, and spread or compress inductors to get on CW frequency with relay off. Use the coil of wire that has a smaller diameter (supplied) for the hairpin match on the input to the switchbox. That how it is suppose to work. I think you will have to trial and error to get everything correct. You would not build it on the ground and expect it to work on the first try. I have the box but have not installed it. The mfg supplied black plastic ties. I don't think this will do it. The aircraft safety wire sounds like the way to go. My thinking is if you are going to run power then you want the switchbox for SSB. If you just run 100 watts you can tune out the SWR with a tunner and do just fine. Let me know if you need more info. A better way would have been a to supply a bracket similiar to the reflectors drilled to mount into the boom and holding the switchbox from the top. The box has a door that can be open to make your adjustments. Joe - K9DMV >From: Richard Thorne <rthorne@tcac.net> >To: JOSEPH SZCZUBELEK <k9dmv@hotmail.com> >Subject: Re: [Force 12 Talk] Mounting switch boxes to the boom >Date: Mon, 11 Sep 2000 12:28:30 -0500 >MIME-Version: 1.0 >Received: from [208.180.118.31] by hotmail.com (3.2) with ESMTP id >MHotMailBB8660E50035D821EEABD0B4761FDAA50; Mon Sep 11 10:27:06 2000 >Received: from tcac.net ([1.1.1.1]) by europa.cox-internet.com >(InterMail vK.4.02.00.10 201-232-116-110 license >1dc0b39e31881b14e43eebad2dae5270) with ESMTP id ><20000911172851.IIQ3894.europa@tcac.net> for <k9dmv@hotmail.com>; >Mon, 11 Sep 2000 12:28:51 -0500 >From rthorne@tcac.net Mon Sep 11 10:31:58 2000 >Message-ID: <39BD163E.54B3EAE5@tcac.net> >X-Mailer: Mozilla 4.7 [en]C-DIAL (Win98; U) >X-Accept-Language: en >References: <20000911163934.YUOA3741.io@dante.qth.com> > >Joe: > >How do you like the relay box? I'm fixing to order one for the upcoming >contest >season. > >As it is now, the antenna is tuned for cw. How do you have to tune the >stubs >for the relay box to work? Is the antenna tuned for ssb and the relay >brings >the reasonance down to cw or is it visa versa? > >I wonder if a second relay box needs to be installed on the reflector? Just >curious. > >Thanks. > >JOSEPH SZCZUBELEK wrote: > > > I have the Force 12 40 meter relay switch box that mounts to the boom of >the > > C4S next to the 40 mtr dipole and gives the ability of switching the 40 >mtr > > linear loaded dipole from CW to SSB. The rather large grey box is >secured to > > the boom with black plastic tie clamps. I can also use electrical tape >to > > help secure the box to the boom. It seems that there might be a better >way > > of securing this box to the boom. Does anyone have a better solution. My > > guess is that it is only a matter of time before this part of the >antennae > > becomes a problem. > > > > Wondering if other owners have installed the box with only the > > tie clamps. > > > > Best, > > > > Joe Szczubelek - K9DMV > > >_________________________________________________________________________ > > Get Your Private, Free E-mail from MSN Hotmail at >http://www.hotmail.com. > > > > Share information about yourself, create your own public profile at > > http://profiles.msn.com. > > > > -------------------------------------------- > > Force12Talk mailing list provided as a service by Force 12 Antennas, >Inc. > > Force 12 Web site: http://www.qth.com/force12 > > > > Submissions: send to Force12Talk@qth.com > > To unsubscribe: send a blank e-mail to Force12Talk-leave@qth.com > > Force12Talk Message Archive: http://www.qth.com/force12/list/force12talk > > For problems with the list, contact n4zr@qth.com > >-- >73, > >Richard Thorne >ARS N5ZC (ex KA2DSY, N2BHP, WB5M) >Remote Control Airplanes: AMA# 657062 >http://www.tcac.net/~rthorne/ > > _________________________________________________________________________ Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com. 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