Re: [IRCA] KAZ versus Pennant/Flag

[Neil Kazaross <neilkaz58@xxxxxxxxx>]

A quick EZNEC look at varying the height of the mast near Rt, so as to have
unequal mast heights doesn't help the antenna and makes the beamwidth
slightly wider.  73 KAZ

On Fri, Oct 26, 2018 at 1:32 PM Neil Kazaross <neilkaz58@xxxxxxxxx> wrote:

> OK Mark, let me understand what you're asking. You want me to adjust the
> height of the support mast closest to the nulling resistance? This will
> result in loops that aren't the same size, and based upon previous work,
> while good nulls can still be had, the effect of having one of the two
> loops in series with a smaller one, will be a somewhat wider beamwidth.
>
> In your experiments, you may have found some magic very deep nulls at some
> frequencies, but I'll bet that at some others the nulls were worse. I'll
> also bet that DXers in other locations might not get the same results you
> got.
>
> In practice while nulls deeper than 30 dB are nice, and you hope that a
> well built DKAZ away from reflecting structures would have quite a few in
> the daytime, it isn't very likely that someone else at a different QTH
> could get the exact results you got.
>
> 73 KAZ
>
> On Fri, Oct 26, 2018 at 11:23 AM Mark Durenberger <Mark4@xxxxxxxxxxxxxxx>
> wrote:
>
>> KAZ:  Included in my voluminous measurements this summer was a set of
>> data taken with various height-extensions of the null-side support pole.  I
>> got this idea from the way some AM Directional-Antenna systems are designed
>> with un-equal tower heights.
>>
>>
>>
>> Can you run a few EZNECs assuming a front pole height of 22 feet with a
>> few different âbackâ-pole heights?  We may discover that identical-apex is
>> the best solution.
>>
>>
>>
>> On the other handâ
>>
>>
>>
>>
>>
>> Cheers!
>>
>>
>>
>> Mark Durenberger
>>
>>
>>
>>
>>
>> -----Original Message-----
>> From: IRCA <irca-bounces@xxxxxxxxxxxxxxxx> On Behalf Of Neil Kazaross
>> Sent: Wednesday, October 24, 2018 2:03 PM
>> To: irca@xxxxxxxxxxxxxxxx
>> Subject: Re: [IRCA] KAZ versus Pennant/Flag
>>
>>
>>
>> The Double Loop genre of antennas models to have better back end nulling
>> performance at relevant higher angles (ie rather short skip) than do the
>> single loops. This is because a double loop is nearly electrically the same
>> as an end fire array of two single loops.
>>
>>
>>
>> 73 KAZ
>>
>>
>>
>> On Wed, Oct 24, 2018 at 1:27 PM Mark Pettifor < <mailto:
>> mark@xxxxxxxxxxxxxx> mark@xxxxxxxxxxxxxx> wrote:
>>
>>
>>
>> > Well here's something that's been on my mind lately, regarding
>>
>> > differences between superloops and the DKAZ:
>>
>> >
>>
>> > It seems to be my experience so far that at night, the back and side
>>
>> > nulling characteristics of these antennas changes, due to sky wave vs.
>>
>> > ground wave, yes? Which one is more affected by those changes?
>>
>> >
>>
>> > Mark
>>
>> > Goshen, IN
>>
>> >
>>
>> > On 2018-10-24 1:42 pm, Chuck Hutton wrote:
>>
>> > > Mark -
>>
>> > >
>>
>> > >
>>
>> > > No arrogance detected here.
>>
>> > >
>>
>> > > Now back to the issue of DKAZ low band performance...â
>>
>> > >
>>
>> > >
>>
>> > > Chuck
>>
>> > >
>>
>> > >
>>
>> > > ________________________________
>>
>> > > From: IRCA < <mailto:irca-bounces@xxxxxxxxxxxxxxxx>
>> irca-bounces@xxxxxxxxxxxxxxxx> on behalf of Mark
>>
>> > > Pettifor < <mailto:mark@xxxxxxxxxxxxxx> mark@xxxxxxxxxxxxxx>
>>
>> > > Sent: Wednesday, October 24, 2018 8:58 AM
>>
>> > > To: Mailing list for the International Radio Club of America
>>
>> > > Subject: Re: [IRCA] KAZ versus Pennant/Flag
>>
>> > >
>>
>> > >
>>
>> > > Apologies, Chuck, and to the rest here. In looking back at my post,
>>
>> > > I realize I could have said things a lot less arrogantly and
>> put-offish.
>>
>> > > That's how I sounded to myself anyway after re-reading what I posted..
>>
>> > >
>>
>> > > 73,
>>
>> > > Mark
>>
>> > >
>>
>> > > On 2018-10-24 1:57 am, Chuck Hutton wrote:
>>
>> > >> Mark -
>>
>> > >>
>>
>> > >>
>>
>> > >> I suppose we all agree that the DKAZ has nailed some great catches.
>>
>> > >>
>>
>> > >> My goal was to point out a shortcoming, not to say that it can't
>>
>> > >> hear DX a la Colombia / Venezuela / Nicaragua.
>>
>> > >>
>>
>> > >>
>>
>> > >> Chuck
>>
>> > >>
>>
>> > >>
>>
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