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.
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