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@nk7z.net
<mailto: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 <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@gmail.com <mailto: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"*
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