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. Chuck’s 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 ‘special’ 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 <[email protected]> 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 <[email protected]> on behalf of Don Moman VE6JY >> <[email protected]> >> 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 <[email protected]> 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 >> > >> > >> > ________________________________ >> > >> > >> _______________________________________________ >> IRCA mailing list >> [email protected] >> http://montreal.kotalampi.com/mailman/listinfo/irca >> >> Opinions expressed in messages on this mailing list are those of the >> original contributors and do not necessarily reflect the opinion of the >> IRCA, its editors, publishing staff, or officers >> >> For more information: http://www.ircaonline.org >> >> To Post a message: [email protected] >> >> _______________________________________________ >> IRCA mailing list >> [email protected] >> http://montreal.kotalampi.com/mailman/listinfo/irca >> >> Opinions expressed in messages on this mailing list are those of the >> original contributors and do not necessarily reflect the opinion of the >> IRCA, its editors, publishing staff, or officers >> >> For more information: http://www.ircaonline.org >> >> To Post a message: [email protected] > > Nick Hall-Patch > Victoria, BC > Canada > _______________________________________________ > IRCA mailing list > [email protected] > http://montreal.kotalampi.com/mailman/listinfo/irca > > Opinions expressed in messages on this mailing list are those of the original > contributors and do not necessarily reflect the opinion of the IRCA, its > editors, publishing staff, or officers > > For more information: http://www.ircaonline.org > > To Post a message: [email protected] _______________________________________________ IRCA mailing list [email protected] http://montreal.kotalampi.com/mailman/listinfo/irca Opinions expressed in messages on this mailing list are those of the original contributors and do not necessarily reflect the opinion of the IRCA, its editors, publishing staff, or officers For more information: http://www.ircaonline.org To Post a message: [email protected]
