Changing the frequency

How do I change the frequence so that my airport sends out the signal on 5.5 rather than 2.4?

Ahhhh, I think I see a misunderstanding... setting the multicast rate to 2 Mbps (for example) does NOT limit every client to that bandwidth. What it does is break the connection to a client if 2 Mbps link can not be maintained to that client.
Every client negotiates bandwidth individually. Regardless of what the multicast rate is set to, the clients are going to be using the highest data rate their connection to the base station is capable of. Therefore the clients close to the base station will be using a high data rate while the clients far from the base station will be using a lower data rate.
If the data rate to any client falls below the multicast rate, that connection will be dropped.
The AEBS has no settings to limit bandwidth or spread it out among clients. I think that is what you are looking for. Any client can dominate the bandwidth.

Similar Messages

How to change the frequency of pulse train on the fly using an array of values?

Hi all!
First I want to thank U for the great job you are doing for this forum.
Iam still busy trying to control a stepper motor, by sending pulses from my E-series 6024 to a compumotor s6- stepper Driver. I've managed to get it working. I desperately need to control the motor using the values from an array. I believe we can use two approaches for that:
1st - I can get an array of the "numbers of pulses". Each element must run for 10 milliseconds. Using that we can calculate the array of frequencies to send the number of pulses within 10 milliseconds for each specific element. Could we use the arrays of "number of pulses" and frequencies in a "finite pulse train " and up
date with each element every 10 millisecond?
2nd - Or Could we use of the frequency array in a "continuous pulse train vi" and update it every 10 milliseconds?
Please note that I must use the values as they are.
Can someone please built a good example for me? Your help will be appreciated.
Regards
Chris
Attachments:
number_of_steps.txt ‏17 KB
frequency.txt ‏15 KB

Tiano,
I will try to better explain the paragraph on LabVIEW. The original paragraph reads ...
"While in a loop for continuous pulse train generation, make two calls to Counter Set Attribute.vi to set the values for "pulse spec 1" (constant 14) and "pulse spec 2" (constant 15). Following these calls you would make a call to Counter Control.vi with the control code set to "switch cycle" (constant 7). The attached LabVIEW programs demonstrate this flow."
You can make two calls to Counter Set Attribute or you can make a call to Set Pulse Specs which, if you open this VI, you will see that it is just making two calls to Counter Set Attribute. What you are doing with the Counter Set Attribute VIs is setting two registers called "pulse s
pec 1" and "pulse spec 2". These two registers are used to configure the frequency and duty cycle of your output frequency.
The example program which is attached to this Knowledge Base demonstrates how to change the frequency of a continuous generation on the fly. Why continuous? Because changing the frequency of a finite train would be easy. When the train completes it's finite generation you would just change the frequency and run a finite train again. You would not care about the time delay due to reconfiguration of the counter.
If you would like to change the frequency of the pulse train using a knob, this functionality will have to be added in the while loop. The while loop will be continuously checking for the new value of the knob and using the knob value to set the pulse specs.
LabVIEW is a language, and as with learning all new languages (spoken or programatic) there is a lot of learning to be accomplished. The great thing is that LabVIEW is much easier than mo
st languages and the learning curve should be much smaller. Don't fret, you'll be an expert before you know it. Especially since you're tackling a challenging first project.
Regards,
Justin Britten

How to change the frequency of a finite/continuous pulse train in the program?

Hello!...
I am trying to modify the Finite pulse train vi example to change the frequency with respect of a ratio (1:2) of the data of a spreadsheet file as they are read one by one.
My aim is to get the pulse train to clock a stepper motor controller, in such way that the speed of the motor increases when the data of the spreadsheet increases and vice-versa.
I think that if I want to get the clock to change its speed, I must change the frequency and if I want it to increase/decrease like the data in the spreadsheet, I must tell the frequency that the data is increasing or decreasing in value.
Obviously the program must do it while it is running
Can anyone see wh
ere I have gone wrong and/or give any suggestions?
I have attached my vi and the spreadsheet file.
Thanks
Tiano
Attachments:
My_VI.vi ‏99 KB
wave.txt ‏18 KB

Tiano,
Try to build the pieces of the program separately. Get a VI running that reads the spreadsheet and reports the data in it sequentially in an indicator (forget about the pulse generation at this time). This indicator will be wired to the frequency input of the pulse generator VI.
You have read the data and have a transposed array. Now you must learn to use the Index Array function in a For Loop to extract the data sequentially. You will wire the increment output [i] of the For Loop into Index Array to shift from one data point to the next.
You have a For Loop with no constant wired to [N] to tell it how many times to run. If you use Array Size to extract the number of entries in the spreadsheet data, this can be the constan
t that tells the For Loop how many times to run.
You are using the Tab Control in a way I have never seen before (I don't think it will work this way either. Tab Control is for presenting and hiding controls, indicators, labels, etc. on the front panel, before running the VI. They are not used to control the program functionality itself. Typically you would use a Boolean to choose between 2 options for a Case Structure.
You can also change the path constant which selects the spreadsheet file into a control. This would allow you to browse for any file you want and eleiminate the need for the Case Structure altogether.
Mike

How to change the frequency of a finite pulse train?

Hi all? I Know I’ve asked once a similar question, but I need a better answer. I would like some ideas or examples on how to modify the example in LV; "Finite Pulse Train Generation - Intermediate for AM9513-Based Devices",so that the frequency can be changed while the VI is executing.
Will i have any problem with I use this VI in a DAQ-STC-Based Devices(E-series)?

Tiano,
I will try to better explain the paragraph on LabVIEW. The original paragraph reads ...
"While in a loop for continuous pulse train generation, make two calls to Counter Set Attribute.vi to set the values for "pulse spec 1" (constant 14) and "pulse spec 2" (constant 15). Following these calls you would make a call to Counter Control.vi with the control code set to "switch cycle" (constant 7). The attached LabVIEW programs demonstrate this flow."
You can make two calls to Counter Set Attribute or you can make a call to Set Pulse Specs which, if you open this VI, you will see that it is just making two calls to Counter Set Attribute. What you are doing with the Counter Set Attribute VIs is setting two registers called "pulse s
pec 1" and "pulse spec 2". These two registers are used to configure the frequency and duty cycle of your output frequency.
The example program which is attached to this Knowledge Base demonstrates how to change the frequency of a continuous generation on the fly. Why continuous? Because changing the frequency of a finite train would be easy. When the train completes it's finite generation you would just change the frequency and run a finite train again. You would not care about the time delay due to reconfiguration of the counter.
If you would like to change the frequency of the pulse train using a knob, this functionality will have to be added in the while loop. The while loop will be continuously checking for the new value of the knob and using the knob value to set the pulse specs.
LabVIEW is a language, and as with learning all new languages (spoken or programatic) there is a lot of learning to be accomplished. The great thing is that LabVIEW is much easier than mo
st languages and the learning curve should be much smaller. Don't fret, you'll be an expert before you know it. Especially since you're tackling a challenging first project.
Regards,
Justin Britten

HT1689 How do I change the frequency in which I enter my password when purchasing/downloading from iTunes?

I changed the settings and now I cannot figure out how to change them to the default setting. How do you change the frequency in which you enter your password in iTunes?

I don't use restrictions but check ..... Settings>General>Restrictions>Allowed Content>Require Password.

How to control keithley 6221 just to change the frequency of a wave at intervals .

Hello,
I'm very new to LabVIEW. I'm trying to control keithley 6221 using RS-232.
What I want to do is just to change the frequency of a sine wave at every 30 seconds, and the series of the required frequencies could be input at the beginning.
Does anybody know how can I do it?
I'll be glad to get any help.
Thanks!

NI does not have a LabVIEW driver for that instrument but you might want to check with Keithley.
On the main Instrument Driver Network page are links on developing an instrument driver. There is a wizard (Tools>Instrumentation>Create Instrument Driver Project) as well as the Instrument I/O Assistant. You will need the instrument manual to look up the programming commands. There are example VIs for serial communication.

In NI-DAQmx, how to change the frequency of a pulse train?

I was using "GPCTR_Change_Parameter()" to change the frequency of my pulse train in Traditional NI-DAQ and Labwindows/CVI; is there any function can do the same thing in NI-DAQmx without restarting the task?

You can do this in one of two ways, depending on the version of NI-DAQ you are using. If you are using 7.2 or later, you can use the counter write functions (ex: DAQmxWriteCtrFreq()), which are available for each flavor of pulse generation tasks (Freq, Time, Ticks). If you are using NI-DAQ 7.0 or 7.1, you can modify the attributes directly (DAQmx_CO_Pulse_HighTime, DAQmx_CO_Pulse_LowTime, etc). Keep in mind that for each attribute pair, one of the attributes will cause the counter to load the new pair. The attribute that causes the load is LowTime, LowTicks, and Frequency.
I hope this helps!
gus....

How can I change the frequency of when Time Machine reminds me to backup?

I used to get a pop up every ten days telling me that it's been ten days since I backed up Time Machine, but since the last time I backed it up, it's started notifitying me everyday. I'm just wondering if there's a way I can change the frequency, since I usually just back it up every few months and I don't keep my external hardrive hooked up all the time.
Thanks!

That's not a particularly wise backup strategy. You should backup at least once per week. Time Machine is designed to backup hourly if left alone. You should have a permanent backup drive that remains connected to the computer at all times except, perhaps, when you are traveling.
If you disconnect the backup drive then Time Machine will start to save snapshots on your computer until the backup drive is reconnected at which time the snapshots are transferred to your backup drive and erased from the computer's drive.
You can use a utility such as TimeMachineEditor 3.0.3 to change Time Machine's backup interval.

EWA report change the frequency of the alert to monthly.

Hi all
In Solution manager we have early watch alert configured for weekly basis. But we need to change it to monthly basis.
In solution manager, when I execute solution_manager, and EWA reports I get reports for every one week. Where can i change this frequency?
Thanks
subbu

Hi Subbu,
Check the sim file at https://service.sap.com/rkt-solman to configure the EWA reports.
Hope this help
Regards,
Rajesh

Changing The Frequency Of My Wi-Fi

Hi All,
In an earlier post I have put a question about problems with my Wireless Accsess Point and Extender, with my Nokia Lumia 520 losing Wi-Fi signal.
I have probably sorted out the problem by changeing the channel number (frequency) on my accsess point.
I have realised that just some distance away fron the back of my house there is a whole range of digitat terrestrial tv repeaters and also a number mobile phone repeaters.
This in the past have caused me problems with my wireless tv sender, untill I bought one with a slightly different frequency.
To add "insult to injury" I am also receiving a good nummber of SSIDs from other Wi-Fi which make things worse for me. I have now gone to channel 3 which is 2.422 Mhz. Since before I was on the standard default channel 6 which is 2.437 Mhz.
Things appear to have improved since I am no longer experiencing breaks in transmission and it only takes a few seconds for my smartphone to pick up the signal comming from my Wi-Fi Extender when I am in its range.

Or "Forget this Network" on the phone's Settings..

How do I change the frequency of Time Machine backups?

Time Machine backs up far to often for me. I think it slows my computer down when it is backing up.
There must be a way to change the frequency

So far I have not seen Time Machine cause any slow down on my Macs nor have I seen it on any Mac for the users I help to support.
I suggest you download and install EtreCheck from http://etresoft.com/etrecheck
Run EtreCheck and publish report here
Allan

How to change the frequency of time machine back ups

Time machine backs up every hour. And it takes several minutes. I don't need to back up that often. Once a day is fine. But I don't see any way to set the frequency of back ups.

There are a number of applications that can be installed to set different time schedules for TM. I have not provided links as I know nothing about them.
If you do a web search on the title of your post you should find them.

For PCI-4451,How to change the frequency of an output signal without any undefined state

I would like to generate a signal using output channels of PCI-4451 and at the same time capture data using the input channels. Is there any method that I can generate a continuous signal without any undefined state when the signal frequency is being changed?
Attachments:
Input_Signal.bmp ‏729 KB

Wee,
DSA boards such as the PCI-4451 have a number of very desirable properties including high precision and a high sampling rate. The trade-off for the combination of these two properties is that the DSA boards cannot adjust their sampling rate on-the-fly. Instead they have to be stopped and reconfigured. During this reconfiguration time, the value of the board's output becomes flat and level.
If you are looking to adjust the board's output without seeing these flat spots, you have to take a different approach to programming a DSA board. Instead of reconfiguring the board, what you need to do is allow the board to continue to run (at the same output frequency), and then overwrite the output buffer that the board reads to output values. This will
allow you to output new data without the flat spots. Below you will find an example that displays this behavior.
If you determine that this is not an acceptable workaround due to the limitations on output rates, you may want to look at using a Multifunction DAQ board (60xx or 62xx) or an arbitrary waveform generator (54xx) device instead.
Best of luck with your application.
Regards,
Jed R.
Applications Engineer
National Instruments
Attachments:
Cont_Gen_Voltage_Wfm-Int_Clk-With_Updates_for_DSA.llb ‏161 KB

How to avoid delay during analog output generation by changing its frequency?

Windows XP
LabVIEW 7.1
PCI-6036E + BNC-2120
Hi,
I am going to create a vi to generate an engine speed sensor signal (a simple square wave with specific missed pulses, in my case 58 pulses “teeth” and 2 missed pulses “missed teeth”) as an analog output but in addition give me the opportunity to control parameters for example frequency online to simulate the engine speed changes during running that vi. For this purpose I have started with “Continuous Generation.vi” which is available in NI Example Finder under the following path:
Hardware Input and Output > Traditional DAQ > Analog Output > Continuous Generation.vi
Then I modified it towards above mentioned goal, all related vi s are attached. The main vi is: "Motor Signal Generator_1.12.vi"
At the first try it looks that it works properly but when have a look on that more accurately with Oscilloscope (fortunately I have a good one: Agilent 54621A – 60 MHz, 200 Ms/s) obviously there is a gap (delay or Jitter) whenever I change the engine speed. It is also attached in Signal generation_problem report.doc file.
Note: Small gaps are OK and related to predefined missed teeth but the big one is happened during changing engine speed.
As far as I understand it is related to the time which case structure in AO C-GEN sub-vi needs for AO reconfiguration each time after changing the engine speed (update rate). How can I get rid of this delay or gap during signal generation and generating completely continuous signal?
I have to mention that obviously I changed the frequency by changing the update rate. The other possibility is to change the number of updates in one period (refer to "generate arb frequency.vi" in NI site: http://sine.ni.com/apps/we/niepd_web_display.display_epd4?p_guid=B45EACE3E48F56A4E034080020E74861) which resulted in no delay however then I can not change the frequency continuously but step by step (for example jump from 5Khz to 2.5KHz immediately) and this can not pass to my application.
Any hint is appreciated.
regards
Attachments:
Signal_generation_NIsupport.zip ‏81 KB

Hi Roozbeh,
The following example will allow you to vary the pulse train frequency during run time.
Thanks,
Lesley Y.
Attachments:
GenDigPulseTrain-ChangingSpecs.vi ‏75 KB

Automatically decreasing the frequency of a sinwave in a While loop, at a set timing.

Hi,
I am quite new on labview, I just started to use it roughly a month ago.
I am trying to simulate impedance measurement (not connected to any load units yet).
I am struggling to find a proper way to change the frequency of the sinwave, after a certain length of time, to make it describe a full spectra of frequency. I don't want to change it at every iteration, but like every 80 seconds, after the start/stop button has been pressed.
To be more clear, I want to set a Max frequency, a Min frequency, and have the program dividing the frequencies by two (10000, 5000, 2500... Assuming the Max is 10000 for example) every 80 seconds. And stopping at the min frequency.
Here is the vi attached.
If you think of better way to run my .vi, please let me know.
Kentmey.
Kentmey
Attachments:
Sin wave start stop.vi ‏97 KB

The frequency is set by the 'w' parameters in your sine wave function.
So basically, you want a function that reads in the current time and outputs a frequency value starting at 10000 and decreasing by 50% every 80 seconds.
Here is a simple VI that will do exactly that. It takes the data from Elapsed time (s) and delivers a frequency to w.
Right now, it's set to start at 10,000 but you can wire Fmax instead.
Attachments:
Untitled 1.vi ‏6 KB

Changing the frequency

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