K5IN, >From the yardstick dimensions of the dipole shown in your photo's it appears >to me that your antenna was designed with a center freq. of 485 MHz, but that >does not necessarily mean this or other such antennas are unusable, as a Smith >Chart design of a suitable simple impedance matching section consisting of >series and shunt coax attached at the antenna feed-point coax will correct for >the mismatch occurring at lower freq(s). thus negating the need for any dipole >or harness modifications. (Been there, done it). Allan Crites WA9ZZU
--- On Sat, 3/28/09, Steve Allred <[email protected]> wrote: From: Steve Allred <[email protected]> Subject: Re: [Repeater-Builder] What is this UHF antenna To: [email protected] Date: Saturday, March 28, 2009, 5:50 PM K5IN, The antenna you have is a DB-406. They are a old design and were fairly narrow banded (450-470). As a rule they do not make the Ham band with any kind of return loss numbers that are desirable for use as a 440 repeater antenna. With the loops orientated the way they are in your picture the old DB books showed the antenna to have a gain of approx 10.5 db. You will most likely need to replace the harness, but check it out thoroughly, it just might be one of the rare ones that will work well on the 440 band. 73, Steve / K6SCA --- On Sat, 3/28/09, k5in <k...@comcast. net> wrote: From: k5in <k...@comcast. net> Subject: [Repeater-Builder] What is this UHF antenna To: Repeater-Builder@ yahoogroups. com Date: Saturday, March 28, 2009, 2:04 PM I know, I am just another (rank) amateur but here are some pictures of the mystery antenna. It appears to be 3 dipoles fed on the bottom half and 3 on top. Harness definitely appears to be factory made. Hopefully the pics will help someone to identify this for me. I have more pics
