For weak signal work with no strong signals capable of overloading RX stages, there is no advantage in installing 250 Hz at 8215 kHz IF. Operating comfort may be increased slightly by a narrow filter
My mistake, NOT is missing, should read as follows: Operating comfort may be increased slightly by a narrow filter, such as Inrad's 125 Hz at 455 kHz IF, or the built-in 60 Hz DSP APF. They will NOT
You need a trifilar winding, i.e. wind it using three parallel wires. Then connect wires in series, just as if you had three separate windings. To match 50 Ohm to 22 Ohm proceed as following. Let the
I've seen such an advice, but no explanation was given. In absence of some good reason to pass an electric current from wire A to wire B, I'd rather keep those wires unconnected. 73, Sinisa YT1NT, V
5 x 100 ft, or even 6 x 83 ft will do better than just a few longer ones. 73, Sinisa YT1NT, VE3EA _______________________________________________ UR RST IS ... ... ..9 QSB QSB - hw? BK
Those two files are completely unrelated, even the duration is not the same. The file http://www.sdrham.com/bin/cq_unfiltered.mp3 has a very weak signal on 650 Hz. The file http://www.sdrham.com/bin/
Perfectly true. Wait a minute, a piece of coiled wire is not a perfect inductor! It's a completely different beast: the perfect inductor has zero length, but a piece of coiled wire almost always has
A current decrease (meaning less current at one end that at the other) is not a loss, and it's far from being unexplained. It's caused by the standing wave, just like the current decrease on a straig
Capacitance from primary to secondary will degrade common mode isolation on higher frequencies. Depending on your needs, it may still be sufficient. The splitting and matching function is fine. The n
... ... Folding has nothing to do with either radiation resistance or ground losses. It is impedance-transforming device only. You've just performed 1:4 impedance transformation, nothing else. 73, Si
I did a detailed study of this device last year, and can confirm that the marketing story of being able to handle SWR of 65:1 is an absolute nonsense. 73, Sinisa YT1NT, VE3EA ________________________
If one wishes to look at this as a simple voltage divider, then the end of the souce cable should be terminated in 50 Ohms, assuming that the unknown impedance is substantially higher. If there is a
It's fun to learn that Dr. Maxwell, the inventor of electromagnetic waves, had used metric units exclusively 200 years ago. So, why we cannot do the same today? 73, Sinisa YT1NT, VE3EA ______________
The question of correlation with reality must be answered for each particular sumulation. NEC works most accurately with straight thin wire antennas. It leaves much to be desired with telescopic tub
A hairpin or a parallel matching inductor should be adjusted this way: 1. select inductance (hairpin length); 2. adjust wire length for the desired resonant frequency. Repeat 1 and 2 until you get SW
The purpose of a choke is to prevent the coax shield from becoming a part of your antenna. Do you want to connect directly to your antenna a long conductor with random length and position, connected
Orientation doesn't matter. Place it as you would place any other inductor, i.e. 1-2 coil diameters away from other metallic objects, and from soil. Protect it from elements, and that's it. 73, Sinis
10 kV between contacts, or 10 kV between a contact and the coil? 73, Sinisa YT1NT, VE3EA _________________ Topband Reflector Archives - http://www.contesting.com/_topband
Sommerfeld integral is not an approximation, has not been tuned, and has no provision for tuning. Sommerfeld integral is an exact solution of Maxwell equations for the case of infinite, plane and hom
This is interesting. Where in those 10,000+ lines is the tuning hack? 73, Sinisa _________________ Topband Reflector Archives - http://www.contesting.com/_topband