I have modified several of the DB-224 antennas to the 2 meter band by adding a short stub to lengthen each end of each dipole. I make the stubs from the tubing salvaged from an old TV antenna, and it is easy to flatten one end and wrap it around the curved end of the DB-224 dipole. I drill a hole and add a screw and nut to clamp the addition to the original dipole without drilling any holes in the original. After mounting the stub, I measure 2 inches from the dipole and cut the added stub to that length with a bolt cutter.
I have needed no modification to the original harness to get things to work with a low SWR in the 2 meter ham band. 73 - Jim W5ZIT -----Original Message----- From: [EMAIL PROTECTED] To: [email protected] Sent: Tue, 27 Mar 2007 12:40 PM Subject: RE: [Repeater-Builder] Re: 4 bay folded j pole questions > -----Original Message----- > From: [email protected] [mailto:Repeater- > [EMAIL PROTECTED] On Behalf Of Mike Morris WA6ILQ > Sent: Tuesday, March 27, 2007 1:56 PM > To: [email protected] > Subject: Re: [Repeater-Builder] Re: 4 bay folded j pole questions > > At 06:11 AM 03/27/07, you wrote: > > Thanks i found out its a Andrew dB224 - 155-165mhz, i was hoping it > >would be in the 145mhz - 2 meter ham band range but it seems you cant > >adjust this type of antenna. > > Not without a hacksaw and a TIG ? MIG ? welder. How about some clamps and a small aluminum rod attached to each end of the dipole? That should move it down enough. Be careful about drilling holes in the element ends as someone suggested. Some antennas run the feed line through the element all the way around. The phasing harness may end up being too short though. If the phasing harness has connectors in it they can be lengthened by installing some right angle connectors in each leg to lengthen them a bit. I once did this with a Sinclair hybrid ring duplexer to lengthen the stubs to get it to tune to 2 meters. 73 Gary K4FMX ________________________________________________________________________ Check Out the new free AIM(R) Mail -- 2 GB of storage and industry-leading spam and email virus protection.
