Hello
KD9SV made a great Magic T
https://www.dxengineering.com/parts/svp-sv-rsc
73,
Jorge
CX6VM/CW5W
El mar, 9 feb 2021 a las 23:02, Lee STRAHAN () escribió:
> Hi Low Band people,
>Nice presentation Steve. I would like to point out that Beverage users
> or even other phased antenna users s
https://dxnews.com/ua9ba-spitfire-160m/
73 Al 4L5A
_
Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
Grant KM5KG (SK) had a Windows program for impedance matching network design
that provided current and voltage levels for each component in the system,
based on the power passing through the network to the load, as well as many
other useful features for reducing a theoretical design into a pr
Hi Eric,
Long time no speak - hope you are well.
Have you looked at SimSmith? It appears to do some of the things you are
looking for. Plenty of videos on YouTube or start here perhaps:
https://www.w0qe.com/SimSmith.html
73 Chris, G3SVL
On 10/02/2021 17:16, Eric Scace K3NA wrote:
Gran
Ham radio literature often IMHO misuses the term
"magic tee" to refer to a transformer-based
0 degree hybrid combiner/splitter.
AFAIK, a magic tee is a WAVEGUIDE device as explained here:
https://www.tutorialspoint.com/microwave_engineering/microwave_engineering_eh_plane_tee.htm
and here:
http
My impression is that a hybrid combiner, which introduces 90 degree shift
(hence two identical signals of amplitude A fed to its inputs will give in
total a signal with the amplitude of 1.41*A) is 3dB less efficient in
comparison to a simple combiner where A+A gives 2*A at the output.
Do you hav
Hi All,
Rick I have to agree with you up to a point. Your 9 circle and other 8
circle receiving arrays except mine are on wide footprints and only use 4
active antennas at a time. All of my antennas are reduced footprint antenna
arrays which require much more phasing accuracy for optimum per
On 2021-02-10 5:25 PM, P H via Topband wrote:
A loss of 3 dB may be like "to be or not to be" of a QSO on 160
meters.
That is extremely unlikely. The limiting factor on 160 meters is
signal to noise ratio, not absolute signal levels. Most amateur
receivers have absolute sensitivities of -130
On 2/10/2021 9:16 AM, Eric Scace K3NA wrote:
More generally, is there a modern software tool available
Hi Eric,
Many of us are using SimSmith for modeling anything that can fit on a
Smith Chart. Freeware, mature, runs in Java, imports Touchstone files
from measurements and antenna models (in
This antenna was clearly working well at UA2FW in the recent CQ 160 contest.
When I listened on the band, UA2FW was, by far, the strongest signal coming
out of Europe in mediocre conditions. Normally northern Europe, including
UA2, is at a disadvantage in terms of propagation to the US. Also, UA2
The 90 degree hybrid is a third type of hybrid combiner,
distinct from the 0 degree and 180 degree types. It
is typically used for 4 square phasing. All 3 combiners
basically have a 3 dB insertion loss for signals having
appropriate phase conditions.
What you say is true to the extent that usin
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