What is SimSmith?
SimSmith Is An Evolving Program. This means that over time, basic operation can change. Changes are made for a variety of reasons: adding functionality, fixing bugs, making things ‘consistent’ across subsystems, making things ‘intuitive’ for the user, meeting industry standards and/or expectations, etc.
How do you read a Smiths chart?
Real or resistive part with magnitude 1 a similar circle which passes through the resistance axis at zero point 2 represents a normalized resistance of zero point 2 at every point on that circle.
What does a Smith Chart show?
The Smith Chart is used to display an actual (physical) antenna’s impedance when measured on a Vector Network Analyzer (VNA). Smith Charts were originally developed around 1940 by Phillip Smith as a useful tool for making the equations involved in transmission lines easier to manipulate.
What is forbidden region in Smith Chart?
Because of the way in which the addition of series and parallel capacitances and inductances move along lines of admittance and reactance, there are certain areas on the Smith Chart, known as forbidden regions, within which the combinations of inductance and capacitance cannot be used to translate the impedance to the …
Why is a Smith chart necessary?
Smith chart can be used to display several parameters including; impedances, admittances, reflection coefficients, scattering parameters, noise figure circles, constant gain contours and regions for unconditional stability, and mechanical vibrations analysis, all at the same time.
Is Smith chart still used?
The Smith chart is most frequently used at or within the unity radius region. However, the remainder is still mathematically relevant, being used, for example, in oscillator design and stability analysis.
What are the advantages of Smith chart?
The main advantage of the Smith Chart is that one can, with experience, quickly glean qualitative relationships. For example, at a glance one can tell from the Smith Chart that: the circuit is matched at the center frequency. the circuit has the same amount of mismatch at the edge frequencies.
How many types of Smith charts are there?
Types of Smith Chart
There are mainly two kinds of Smith chart, the impedance or the Z-Smith chart and the other one admittance or the Y-Smith chart. The superposition of Z or Y-Smith chart gives the Z-Y Smith chart or the complete smith chart.
What is SWR in RF?
Standing-wave ratio (SWR) is a mathematical expression of the non-uniformity of an electromagnetic field (EM field) on a transmission line such as coaxial cable. Usually, SWR is defined as the ratio of the maximum radio-frequency (RF) voltage to the minimum RF voltage along the line.
Is 1.5 SWR good?
SWR Range Explanations. SWR 1.0-1.5: The ideal range! If your SWR is under 1.5, you’re in great shape. If you’re at 1.5 and really, really want to drop down to closer to 1 it’s likely possible to do with addition tuning, different equipment or a different mounting location.
What SWR is too high?
If the SWR on channel 40 is higher than that on channel 1, your antenna is too long. If the SWR on channel 1 is higher than that on channel 40, your antenna is too short.
Is an SWR of 2 OK?
SWR 2.0 – 2.4: While not good, this likely won’t damage your radio with casual use. However, you should definitely try to improve it if you can. SWR in this range is usually caused by a poor antenna mounting location and/or a poor choice of equipment for your specific vehicle.
Should my CB be on SWR or S RF?
In the S/RF position the meter will show transmit power and receive signal strength. The CAL and SWR positions are only for checking the SWR of the antenna. Recommended Setting: The S/RF position.
How do I bring a SWR down?
If your antenna is mounted down low on the vehicle, like on the bumper or behind a pickup truck’s cab, the signal can bounce back to the antenna, causing a high SWR. To alleviate this, keep at least the top 12 inches of the antenna above the roof line, and position the antenna as high as possible on the vehicle.
Can a pinched coax cause high SWR?
Damaged coaxial cable is a big reason behind high SWR readings. A coax can get twisted, shorted, or pinched while routing through the vehicle. It might come damaged when buying from the market. Hence it is essential to check your coax cable thoroughly before purchasing.
Is 1.5 A good SWR?
Where should RF gain be set?
Volume, Squelch Control, and Channel knobs. The squelch control is ALWAYS present in CB radios, where the RF gain is not.
…
| RF Gain | |
|---|---|
| Where to set it | Commonly full right |
How high is too high SWR?
3.0+:
SWR 3.0+: Performance will be severely affected, and you’re likely to damage your radio with extended transmission use. You SHOULD NOT transmit with your CB at SWR levels above 3.0.
Does the length of coax cable affect SWR?
Coaxial Cable Length Does Not Change Antenna SWR.
What is the best squelch setting?
Ideally, the squelch level should be set just above the background radio noise level or at the point where the desired signal is becoming too noisy to be acceptable. Higher settings of squelch level require higher received signal strength to unmute the receiver.
What is a good SWR ratio?
Is it OK to coil coaxial cable?
There’s nothing inherently wrong with “looping up” extra coaxial cable. In fact, a neatly wound coil of coax can function as an air-core choke balun (“ugly balun”) which is useful for some antenna systems when located at the feed point of the antenna.
What happens if squelch is too high?
If you turn the squelch up too high, you will considerably restrict what radio traffic you can receive. This might be handy if, for example, you are trying to focus on highly localised strong radio messages, but do remember to reset the control afterwards.
How do you set RF gain and squelch?
Some truckers turn the squelch on a CB radio all the way off, turn the RF gain on a CB radio all the way on, then dial back the RF gain control until almost all the noise disappears. That eliminates the choppy signals that a squelched radio produces, but it still allows the distant signals to come in.