Has anybody received a QSL for OZ1LXJ's operation from Greenland during
Sep-Oct, 2013? He made 505 top band contacts.
Thanks
Udo NI0G
_
Topband Reflector Archives - http://www.contesting.com/_topband
Hi Bruce et al
Radiated noise from a new wind farm eventually forced us to close down and
exit the ZL6QH contest station. A detailed report on the noise levels is
available at
http://www.zl6qh.com/rf-noise-measurements-quartz-hill-2009-v3.pdf .
The ZL6QH wind farm used Siemens 2.3 MW
All
Topband list
If you've followed my efforts to shunt feed my Skyneedle tower you'll know that
I settled with a tap point of 67' and 30 or so of spacing with my feed point
reading 42 + j0 ohms. This reading was taken at the interior of my 20 x 30 x
8 steel Hoffman enclosure with the
Since then I've moved the variable capacitor inside the panel and mounted it
to a ¾ think Plexiglas sheet mounted to the back plane with nylon bolts and
washers. There is a 1 air gap between the Plexiglas and the backplane. I
now have seen the 42+j0 ohms change to 45 - j11 ohms...that's the
Well, Carl
I plotted your 45-j11 load on a Smith Chart (normalized to 50 ohms) and it's
very near the origin on a 1.3:1 VSWR circle. Since you have a relatively
short feedline of LMR-400, You should be able to just tune it out at the
transmitter end of the line, and the LMR-400 line will be
BTW. Carl
I agree completely with Tom that there's no point in having a static-bleed
choke on a grounded shunt fed tower!
73,
Charlie, K4OTV
-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Tom W8JI
Sent: Friday, February 21, 2014 8:02 PM
To:
Hi Brian,
Thank you for your input and sorry to find that the windmill farm noise
caused ZL6QH to close down.
It will become evident that each country will need enforce RF noise limits
on windmills, or start rule making if none exist.
In the USA complaints to the ARRL should bring
Thanks to all who replied
Tom W8JI, your comments on the metallic panel and the static bleed choke make
sense. I was so pleased with the FLAT SWR reading with the variable cap
outside the panel but I guess I can live with the slight SWR. (Thanks Charlie
K4OTV). I have a Nye Viking monster
By the way, Carl. it sounds like you might have eliminated a bit of series
inductance when you moved the variable capacitor into the enclosure and you
may have picked up a bit of shunt-C by moving it into the metallic
enclosure, but you are so close to dead-flat 1:1, that it really doesn't
matter.
I'd think your Henry would match that just fine WITHOUT the Nye Viking
tuner!!
73,
Charlie. K4OTV
-Original Message-
From: Carl Braun [mailto:carl.br...@lairdtech.com]
Sent: Friday, February 21, 2014 8:46 PM
To: Charlie Cunningham; 'Tom W8JI'; '160'
Subject: RE: Topband: Shunt feeding
The only benefit of getting it better would be a bit more 2:1 VSWR bandwidth
to keep the amp happy but even then there is sometimes a gotcha when tuning
an antenna.
Carl
KM1H
Subject: Re: Topband: Shunt feeding the Skyneedle - new developments
Well, you can do all that, Carl
But if your
Well, if I recall correctly, Carl, Carl said his feedline was about 70' of
LMR-400, so even at 2 2:1 or 2.5:1 VSWR, the excess losses in 70' of LMR-400
at 1.8 MHz are almost 0, so if he can match it OK at the transmitter end of
the line- no real point in making heroic efforts to achieve a perfect
Charlie
The cap is no where near maxed out. I'm using approx 150pf of a 1050pf
variable cap.
Carl
-Original Message-
From: Charlie Cunningham [mailto:charlie-cunning...@nc.rr.com]
Sent: Friday, February 21, 2014 6:37 PM
To: Carl Braun; 'Tom W8JI'; '160'
Subject: RE: Topband: Shunt
Well, Carl, you might pick up a littie less shunt C with the vacuum
variable, and if it will provide more capacitance, it will probably allow
you to get to j0. I guess if you don't have some other need for the high
voltage capability of the vacuum variable, It should surely do the job!
If you are
Well, that would surely suggest that you should be able to reach j0, by
increasing the series capacitance, Carl, unless there's a shunt-C term that
has entered the picture after mouning that big variable capacitor in the
metallic enclosure. But, again, why bother!
73,
Charlie, K4OTV
I'm working on the radial field weekly.
Here is a theoretical question that results from my particular QTH. The
Skyneedle is situated near a secondary blacktop driveway that is in the back of
my property. I have to run radials over the blacktop to the rest of the
property and, in order to
Hi, Carl
Well, I think that what you are doing with your radials should be OK. I
guess I'd rather get them under the asphalt if I could where they wouldn't
get torn up or b a trip hazard.
BTW I I was playing with your match on the Smith Chart and if you'll add
about 1 uHy inductance in series
17 matches
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