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" <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.
>
>
>
>
>
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