I've seen some return loss figures in the 30-40 dB range on the Decibel antenna. However, sweep one and report back.
Chuck WB2EDV ----- Original Message ----- From: "skipp025" <skipp...@yahoo.com> To: <Repeater-Builder@yahoogroups.com> Sent: Sunday, November 15, 2009 10:57 AM Subject: [Repeater-Builder] Re: Building Low Band Loop Antennas (DB-212) > >> "Chuck Kelsey" <wb2...@...> 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.
