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@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
> 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/
> >
> > 73,
> > Don wd8dsb
> >
> > On Wed, Feb 1, 2023 at 2:26 PM Bob Kozlarek WA2SQQ <wa2sqq@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"*
> >> _______________________________________________
> >> RFI mailing list
> >> RFI@contesting.com
> >> http://lists.contesting.com/mailman/listinfo/rfi
> >>
> > _______________________________________________
> > RFI mailing list
> > RFI@contesting.com
> > http://lists.contesting.com/mailman/listinfo/rfi
> _______________________________________________
> RFI mailing list
> RFI@contesting.com
> http://lists.contesting.com/mailman/listinfo/rfi
>
_______________________________________________
RFI mailing list
RFI@contesting.com
http://lists.contesting.com/mailman/listinfo/rfi
|