[RFI] Flag Antenna Question

[Dave (NK7Z)]

Cool...  I am thinking of comparing it to a Mag loop.  I am setting up a 
RX only antenna for my K4, and suspect the cardioid pattern will do far 
better than the pattern from a mag loop.  Half the noise...  :)

73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist, RFI
ARRL Asst. Director, NW Division, Technical Resources

On 2/1/23 13:39, Don Kirk wrote:
> Hi Dave,
> 
> I have not but I believe it should work (especially since a diamond 
> works).  You can look at other configurations that are known to work by 
> reading the original article about Pennant and Flag receive antennas by 
> Earl K6SE (SK) in the July 2000 issue of QST.  I designed my portable DF 
> antenna as a rectangle because I wanted the most gain possible that 
> would still fit easily in my car.
> 
> 73,
> Don (wd8dsb)
> 
> On Wed, Feb 1, 2023 at 3:50 PM Dave (NK7Z) <dave at nk7z.net 
> <mailto:dave at nk7z.net>> wrote:
> 
>     Don,
>     Have you tried your design with a loop as opposed to the rectangle?
> 
>     73, and thanks,
>     Dave (NK7Z)
>     https://www.nk7z.net <https://www.nk7z.net>
>     ARRL Volunteer Examiner
>     ARRL Technical Specialist, RFI
>     ARRL Asst. Director, NW Division, Technical Resources
> 
>     On 2/1/23 12:09, Don Kirk wrote:
>      > Hi Bob,
>      >
>      > Dave (W0LEV) provided you good insight.  Normally I say just stay
>     away from
>      > wire wound resistors as we know they are definitely inductive,
>     and carbon
>      > resistors are just fine.
>      >
>      > Any value of termination resistor between 680 ohms and 820 ohms will
>      > provide good results for use on my portable flag.  There are just
>     slight
>      > trade offs between how a 680 and 820 resistor perform and you can
>     see front
>      > to back ratio versus elevation plots showing how the 680 ohm
>     resistor and
>      > 820 ohm resistor model.  I actually have two identical portable
>     flags, one
>      > with a 680 ohm termination resistor and one with a 820 ohm
>     termination
>      > resistor and you would be hard pressed telling the difference
>     unless I told
>      > you what to look for in performance.  You can see the plots on my
>     portable
>      > flag website at
>     https://sites.google.com/site/portableflagantenna/
>     <https://sites.google.com/site/portableflagantenna/>
>      >
>      > 73,
>      > Don wd8dsb
>      >
>      > On Wed, Feb 1, 2023 at 2:26 PM Bob Kozlarek WA2SQQ
>     <wa2sqq at gmail.com <mailto:wa2sqq at gmail.com>> wrote:
>      >
>      >> I started putting together one of your portable flag antennas.
>     Regarding
>      >> the resistor that is used by notice it’s called out as a
>     non-inductive
>      >> resistor. Is this something special or with a standard carbon
>     comp or
>      >> carbon film resistor work? If this is something that is super
>     critical I’m
>      >> thinking that I could put two or more larger values in parallel
>     to arrive
>      >> to desire value.--
>      >>
>      >>
>      >>
>      >> *Best 73 de WA2SQQElmwood Park, NJ"The only dumb questions are
>     those we
>      >> don't ask"*
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