Re: [IRCA] Copper pipe loop for amateur radio use - was: Flag antennaquestion

["Craig Healy" <bubba@xxxxxxxxxxxxxxxxxxxx>]

> The latest issue of QST Magazine has an article that describes the
> construction for use on 40 meters (transmit/receive) of a copper pipe loop
> (about 6' square) which is tuned via the use of an adjustable (sliding)
> copper pipe capacitor. A pretty neat design which you might be interested
> in reviewing.

Thanks!  I'll take a look at it.  The copper loops I've built can also be
tuned by adding a winding of about 36 turns into the ferrite toroid and
putting that across a variable capacitor of 365pf or more.  What I did find
is that tuning increased the gain at that frequency.  With the R8B, it
didn't improve any reception.  The receiver was plenty resistant to overload
and didn't benefit from the tuning.  Nulling was similarly not improved.

Craig Healy
Providence, RI

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