Hi,
I am trying to work on 160m (also on 80m) from a city lot.
I have been reading about half slopers in the ARRL Wire antenna classics B
(chapter 7).
I have a 50 ft grounded tower available and can run an sloping wire 60 ft
(1/4 wl on 80m) then add an 80m trap and more wire to work 160m.
Any
Well that was amazing. FT4JA super-easy copy in W3 for several hours before
his sunrise. My RX antenna pointed toward EU. Working well into USA midwest
with a very occasional European. I didn't get through but I heard many
regulars that did!!!
Now about 10 minutes after his sunrise I can still hea
Tnx, Jim...yes, see now where 43 material works almost as well...will find #43
core...Jim R.
From: Topband on behalf of Jim Brown
Sent: Friday, April 1, 2016 2:55 PM
To: topband@contesting.com
Subject: Re: Topband: Receive loop observations
On Fri,4/1/
On 4/1/2016 1:25 PM, donov...@starpower.net wrote:
Hi Jim,
A properly constructed loop antenna absolutely requires a preamp.
Yes, but usually the preamp function built into the radio is
sufficient.
If your loop is operating correctly it will be omni-directional for
skywave signals and it
On Fri,4/1/2016 1:36 PM, James Rodenkirch wrote:
need to find a Fair-rite 61 core
N6RK notes that Fair-Rite #43 will work fine, with slightly increased
loss. Mu is higher, so you will likely need fewer turns to get 100 uH.
#43 is much easier to find.
73, Jim K9YC
_
Topband R
You are the 2nd fella, Frank, to remind me about a matching/coupling
xfmr.muchas gracias!!!
71.5/72 de Jim R. K9JWV
From: donov...@starpower.net
Sent: Friday, April 1, 2016 2:25 PM
To: Top Band Contesting
Subject: Re: Topband: Receive loop observations
Hi
Doggone it, Don...I'd seen that presentation before - simply forgot about using
a xfmr to couple unbalanced coax to balanced rcv antennagood on ya for
sending that on -- need to find a Fair-rite 61 core.hihi
From: Don Kirk
Sent: Friday, April 1, 2016 2:
Hi Jim,
A properly constructed loop antenna absolutely requires a preamp.
If signals are so strong that you don't require a preamp then its
likely that the signals you're hearing are not actually coming from
the very inefficient loop but from other sources such common mode
from your coax fee
Hi Jim,
I know my following info does not directly answer your question, but I do
think it's important regarding feedline isolation.
I suggest you take a look at the recommendations of N6RK regarding the use
of a matching transformer to feed tuned shielded loops as it isolates the
feedline from t
I have installed a receive loop ( http://www.qsl.net/kc2tx/ ) and finished
measuring and observing...
Measurements:
VSWR --- 1.7 @ 1.830
ZO - 77 at 1.830
Observation:
Following ON4UN's comments regarding needing a preamp or not, measured S1 to 2
noise level with antenna connected d
I live in one of the areas of G-land with the highest concentration of wind
farms.
What I learned while looking for a new low-noise QTH:
- small wind generators (50kW or less) have induction generators and therefore
are essentially no-noise on HF & VHF.
- mid-size (up to around 1MW) usually have
Brian,
The last paragraph is particularly interesting. Variable speed drive
motor controllers are well known noise generators, primarily because
they are generally very poorly installed in a manner that their wiring
forms loops with a large loop area, establishing strong magnetic fields
that
ZL6QH is the only Long Path 160m qso I ever made.
Pity it had to switch off!
PE5T
--
From: "Brian Miller"
Sent: Friday, April 01, 2016 2:22 PM
To:
Subject: Re: Topband: Wind Farming
Thanks Frank
I was previously the chair of the Quartz Hill Us
Thanks Frank
I was previously the chair of the Quartz Hill User Group responsible for the
ZL6QH station.
We undertook measurements of the noise from the wind farm at the ZL6QH site. A
report on our measurements is published at
http://www.zl6qh.com/rf-noise-measurements-quartz-hill-2009-v3.pdf
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