I have a 2 loop DB212-2 which is cut for 48 MHz. I want to use it for a 6M repeater on 53.13. I've shortened the loops to about 53". Do I need to shorten the length of the coax which runs from the antenna to the "T"? What should be the length of the cable that runs from the "T" to the feedline (cable C in instruction flyer.
Thanks, Dave Novotny, WA6IFI --- In Repeater-Builder@yahoogroups.com, "Jeff DePolo" <j...@...> wrote: > > > I have dimensional data for both Decibel and Celwave lowband folded dipoles > *somewhere*. If there's interest I'll hunt for them. > > I think the Celwave design (with the "stingers") would be easier to > fabricate - no bending involved. > > --- Jeff WN3A > > > > -----Original Message----- > > From: Repeater-Builder@yahoogroups.com > > [mailto:repeater-buil...@yahoogroups.com] On Behalf Of skipp025 > > Sent: Sunday, November 15, 2009 10:57 AM > > To: Repeater-Builder@yahoogroups.com > > Subject: [Repeater-Builder] Re: Building Low Band Loop > > Antennas (DB-212) > > > > > > > > > > > "Chuck Kelsey" <wb2edv@> wrote: > > > FYI - Sinclair got the extra bandwidth by stager tuning > > > the antenna element from the 1/4-wave matching transformer > > > that is inside the element. The trade-off was a decrease > > > in return loss (higher VSWR). > > > Chuck > > > WB2EDV > > > > Maybe... maybe not. I swept one just a short time back and > > the return loss was about 15.6 dB, which makes it a very nice > > usable animal. > > > > I've also had one in parts and the matching coax length was > > what I would have expected. Somewhere in my notes I have all > > the construction information recorded like I did on the Decibel > > Antennas... > > > > I've got a Decibel Loop at the old shop somewhere... if I can > > easily get it up high enough to throw a sweep on it I can > > report the results back. > > > > I'll have another HP Digital Sender (auto feed pdf scanner) on > > line within the month... then you'll have more information to > > chew over. > > > > cheers, > > s. > > > > > > > > > > > > No virus found in this incoming message. > > Checked by AVG - www.avg.com > > Version: 8.5.425 / Virus Database: 270.14.61/2498 - Release > > Date: 11/15/09 07:50:00 > > > > > > >
