I have built and tested Langford's Phased Delta Flag Array. It was very
good. I have built this antenna on a small, remote island in the Bahamas. I
compared it with a DHDL and a single flag (same dimensions as one of the
elements of the array).
The antenna was very good. You can see and hear a
On 3/13/2020 12:34 PM, Richard (Rick) Karlquist wrote:
On 3/12/2020 4:29 PM, Mikek wrote:
I'll stick my neck out and suggest Dallas Lankford's '2 FET amp'.
If anyone has an interest, I have some more files in my computer.
https://www.okdxf.eu/lankford/Hi%20Z%20PPL%20Loop%20And%20Fl
On 3/12/2020 4:29 PM, Mikek wrote:
I'll stick my neck out and suggest Dallas Lankford's '2 FET amp'.
If anyone has an interest, I have some more files in my computer.
https://www.okdxf.eu/lankford/Hi%20Z%20PPL%20Loop%20And%20Flag%20Arrays.pdf
I
On 3/13/2020 11:13 AM, Mikek wrote:
advice about common mode filtering,
This ran in National Contest Journal a year or two ago.
http://k9yc.com/RXChokesTransformers.pdf
73, Jim K9YC
_
Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
I have a plan to put a matching transformer and a Hi Z amp on my
antenna with relay switching,
so I can do a real A, B, comparison. If you have any advice on
implementing that or advice about common mode filtering, I'm listening.
Appropriate relay suggestions would be appreciated.
I meant to add
This is only half tongue-in-cheek.
With the ambient noise going up, and there being limits to the size and cost
of receiving arrays most amateurs can build, the next logical step is to
raise the output power. Perhaps the FCC should be petitioned to raise the
legal limit? They were supposed to s
Me neither.
On Fri, Mar 13, 2020, 12:22 PM Wes wrote:
> It's not clear to me.
>
> Wes N7WS
>
> On 3/13/2020 9:42 AM, Jim Thomson wrote:
> > ## Clearly whats required is a long overdue increase in TX
> power limits on 160 band...and also 80+40.
> > That or arrl legal remote RXs.
It's not clear to me.
Wes N7WS
On 3/13/2020 9:42 AM, Jim Thomson wrote:
## Clearly whats required is a long overdue increase in TX power
limits on 160 band...and also 80+40.
That or arrl legal remote RXs. pick one.
Jim VE7RF
_
Searchable Archives
On Thu, Mar 12, 2020, 3:48 PM Michael Tope wrote:
> There are a lot of SMT to DIP adapter boards out there which would allow
> newer SMD op-amps to be used in older through-hole PWB layouts.
>
>
> https://www.digikey.com/product-detail/en/aries-electronics/LCQT-SOIC8-8/A880AR-ND/4754588
This is
Hi Mike,
Yes, the math can get tricky and cause you to get lost in the forest. I'm not
afraid of doing math (I did a mathematics minor in graduate school) but as an
engineer, I prefer to seek the simplest possible solutions to engineering
problems. This is a case where you can avoid messy mat
Date: Thu, 12 Mar 2020 20:25:16 -0700
From: Jim Brown
To: topband@contesting.com
Subject: Re: Topband: Hi Z amplifiers for 160m
http://www.contesting.com/_topband - Topband Reflector
Hi
https://www.kkn.net/stew/stew_rules.html
I plan to wait for the American and Canadian stations all night and
morning.
Do not forget about the morning in the 16th zone!
Details UY0ZG VE6WZ 2020-03-12 03:33:00 160MCW 1.8
CANADA
-
And do not be afr
FYI, I just found this page with many Dallas Lankford articles:
https://www.okdxf.eu/index.php/technika/80-antenarska-kolekce-dallase-lankforda
. Open the site in Chrome (or use translate.google.com), and it'll
translate from Czech to English.
On an old laptop here, I have many of his articles dow
The document was published last year so we might assume the noise graph is
up to date. To put this in perspective,
To put the ITU-R P.372-14 claimed noise in perspective here's the
calculated antenna terminal voltage for a 100% efficient 1/4 wavelength
vertical in 500 Hz bandwidth. S-units are als
Yes. While most things are being cancelled these days, the Spring Stew is
still on.TreeSent from my Samsung Galaxy smartphone.
Original message From: rgarre...@comcast.net Date: 3/13/20
6:22 AM (GMT-08:00) To: 'Tree' Subject: Spring SPDC Hi Tree,I
didn't see an announcement
I agree with your conclusions regarding the case of isotropic
atmospheric noise. This is the same reason that cold space looks like 3
Kelvin regardless of how high the antenna gain. As the antenna gain goes
up you reinforce to a greater degree a lesser slice of the overall pie.
This ends up bei
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