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Re: [IRCA] KAZ versus Pennant/Flag
I remember Chuck talking about a non-linear amplifier for the DKAZ - one that gave more oomph on the low end than the top end. That would be nice.
I end up making liberal use of attenuation on the Perseus to not overload the top end to get enough signal on the low end.
Chuckâs non-linear amp would be a very nice addition to a 9:1 balun for the business end of a DKAZ vs. a FLG100[LN].
Op amp with some external components and an ability to actually adjust where the rolloff begins aught to be possible.
Who will design such a device?
May we could talk Andy into making a âspecialâ DKAZ version of the FLG100?!
Wild talk from a crazed DXer.
Bill Whitacre
Alexandria, VA
---
> On Oct 23, 2018, at 10:48 PM, Nick Hall-Patch <nhp@xxxxxxxx> wrote:
>
> Thanks for doing that Chuck. One interesting number is 42dB F/B at 0.5MHz for 120'. Is that correct?
>
> But the problem seems to go beyond low signal level on the lower band with smaller DKaz. Beyond that one data point I mention, it also seems that the larger DKaz provides significantly better F/B on the low band, as it also weakens the F/B on the upper band.
>
> Looks like two DKaz' are in order for the next DXpedition, a big one and a small one...
>
>
> Nick
>
>
>
>
> At 01:31 2018-10-24, Chuck Hutton wrote:
>> Here's a little comparison of DKAZ'es from 100' to 200'.
>>
>>
>> LENGTH .5 MHZ GAIN 1.5 MHZ GAIN .5 MHZ F/B 1.5 MHZ F/B
>> 100 -61.1 -34.6 35.1 47.3
>> 120 -58 -31.8 42 32.5
>> 140 -55.4 -29.5 37.4 30.7
>> 160 -53.2 -27.5 39.4 26.5
>> 180 -51.2 -26.8 44.8 22.2
>> 200 -49.5 -24.2 45.2 19.1
>>
>>
>> The formatting is a little messed up when pasting data from Excel.
>>
>>
>> Chuck
>>
>>
>> ________________________________
>> From: IRCA <irca-bounces@xxxxxxxxxxxxxxxx> on behalf of Don Moman VE6JY <ve6jy.1@xxxxxxxxx>
>> Sent: Tuesday, October 23, 2018 4:02 PM
>> To: International Radio Club of America
>> Subject: Re: [IRCA] KAZ versus Pennant/Flag
>>
>> http://www.durenberger.com/documents/DKAZ070314.pdf is updated and still
>> SOME FIELD INFORMATION ON THE DOUBLE DELTA (D KAZ) ANTENNA<http://www.durenberger.com/documents/DKAZ070314.pdf>
>> www.durenberger.com
>> The D$B!>(BKaz antenna for MW (and well above) is a Double$B!>(BDelta variant, as seen below. The $B!H(Bself$B!>(Bimpedance$B!I(B of the D$B!>(BKaz is around 1000 ohms at corners $B!H(BA$B!I(B and $B!H(BB.$B!I(B The null$B!>(Bpot at 2000 ohms gives good range.
>>
>>
>>
>> shows the 140 foot version. I don't see anything more recent.... I wish I
>> had. Is there a link? I just built 4 of them last year, one for each major
>> direction. I finally have them all hooked up for this season. With the low
>> wire they are a great moose catcher! I could have easily made them higher
>> but I was just following the instructions. I could have made them larger as
>> I have plenty of room. Now not so easy...
>> Don
>> VE6JY
>>
>>
>> On Tue, Oct 23, 2018 at 3:36 PM Chuck Hutton <charlesh3@xxxxxxx> wrote:
>>
>> > As do we all I think. The 140 foot version was abandoned over 5 years ago
>> > as it wasn't cutting it at th low end.
>> >
>> >
>> > Chuck
>> >
>> >
>> > ________________________________
>> >
>> >
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>
> Nick Hall-Patch
> Victoria, BC
> Canada
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