How to adjust adjacent channel bandwidth to 30 kHz and leave primary at 1.23 MHz

I would also like to level trigger on the RF input of my NI PXI-5660

Take a look at the shipping example called "RFSA Adjacent Channel Power Application Example.vi". If you dig down several levels in the VI heirarchy, you will find "SML Adjacent Channel Power.vi". This is where the actual channel powers are calculated for the center, upper, and lower channel. You will see the simple arithmetic that calculates the frequency bands for each channel. Using this technique and the "SMT Power In Band.vi", you can calculate channel powers for any channels you want with any bandwidth.
Regards,
Brent R.
Applications Engineer
National Instruments

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Welcome to the Support Communities!
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Hi,
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http://zone.ni.com/devzone/cda/tut/p/id/3173
.SUBCKT MLED96 A C P
* A = Anode
* C = Cathode
* P = (light)Power as output voltage in Watts
* Diode forward, reverse leakage and breakdown, and capacitance
characteristics
DLED A VC MLED96
.MODEL MLED96 D
+ IS=10.000E-21
+ N=1.5219
+ RS=1.7433
+ CJO=50.000E-12
+ M=.3333
+ VJ=.75
+ ISR=100.00E-12
+ BV=5.3573
+ IBV=10
+ TT=5.0000E-9
* Leakage resistance
Rleak A VC 40Meg
* Input resistance
Rin P 0 1G
* Power output (as a voltage) - fit to total power output vs. forward
current curve.
ELED P 0 TABLE
{pwr(I(VLED),1.170105501)*EXP(-2.114426964-4.065819492*I(VLED))} (0,0) (1,1)
VLED VC C
.ends
Tien P.
National Instruments

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duplicate
LabVIEW Champion . Do more with less code and in less time .

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I am using Labview (with Flex motion) to program the NI 7344 motion control servo board (PID update rate of 62.4 micro-seconds). This output signal is then amplified by the MID 7654 power amplifier, supplying current to a Voice coil (this can be considered as a Linear DC motor with a bandwidth of 40Hz). This applies the force to a bone sample. Feedback is then provided by a load cell and connected to the ADC feedback channel of the servo board. (For full specs of all mentioned components please refer to the web links which are listed at the end of this email!)
Problem description:
After optimally tuning the PID characteristics and defining the amplitude and pre-load, I can successfully control a continuous, sinusoidally varying force (frequency 1Hz), however when I try to increase the frequency to 10Hz, the amplitude of the output waveform is marginally reduced�i.e. there is attenuation. I know that the bone sample is not viscoelastic enough to act as a low pass filter. The bandwidth of the Voice coil is not a limiting factor either, so�..
How do I extend the bandwidth of this system?
The following Paragraph describes some of the things I have tried, which have had some or no influence. Being a mechanical engineer I would be grateful for any expert advice.
(Note all results have been verified with an oscilloscope where applicable)
Influential Factors:
1) Method of programming.
To generate the wave form a series of points describing one period are written to a circular buffer on the servo board. The points are executed in 10 milli-second intervals and are splined through using a cubic spline algorithm (hence a period described by 100 points gives us a frequency of 1Hz and a 10 point wave gives us 10Hz). All this happens on the servo board in real time. I am confident that although the integrity of the sine wave is reduced at 10 Hz the amplitude is still described within the 10 points and so is not the reason for attenuation. However this does limit the maximum frequency achievable. (I would say the max frequency is about 20Hz)
2) Redefining the resolution of the of the ADC Feedback
The 12 bit ADC feedback channel is scanned at a rate of 50 micro seconds (faster than the loop update rate which is 62.4 micro-seconds). Initially the voltage range was specified at -/+ 10 V giving 20/(2^12) Volts per significant bit, however I noticed that when I increased the resolution to the max possible by changing the range to 0-5 V (giving 5/(2^12) volts per significant bit), the amount of attenuation was reduced, however there was still some attenuation there. This begs another question why would this factor improve the frequency response???
3) PID characteristics
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Can you offer me any expert advice?
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Regards Duncan Webster
Email: [email protected]
Product specs:
Servo board:
http://www.ni.com/pdf/products/us/4mo636-637.pdf
Power amp
http://www.ni.com/pdf/products/us/4mo642-643.pdf

Hi Duncan,
i'm sorry that this answer took this long, but i think a constructive answer which takes a long time is better than a useless answer in a short time....
For the following thought-provoking impulses we have to consider the signal-change when increasing the frequency. The points which describe the signal get streched over the period. Increasing the frequency enlarges the distance between the points.
a) The spline algorithm could be the problem here hence the signal does not correctly pass through the points anymore with increased frequency. Therefor the amplitude decreases with increased frequency. Perharps another kind of spline algorithm can be helpful.
b) Another point can be the control deviation. Since a feedback control system needs a devia
tion for the control, the deviation gets larger when increasing the frequency of the controlled loop. Maybe the control loop has to set the desired value when already getting to a new point. So the signal could get "washy" and the maximum amplitude is reduced.
In this case, the "Velocity Feedforward"-parameter could be of use. This parameter is to use with caution for it can have similar effects like a too high chosen integral term.
c) You can try to set the 7344 to circular contour. Therefor use 2 axis where you use the second axis as dummy (open step). There is a major disadvantage in this setup: since you use 2 axes at the same time, the 7344 can update each axis only with 125 microseconds. But perharps this is sufficient. Either way the parameter of the control loop have to be adapted (integral term reduced).
d) If the 125 microseconds describend in c) is insufficient, you can try to test it with a 7352. The 7352 can handle 2 axis at a time with a update rate of 62.5 microse
conds for each axis.
I hope this answer helps you in solving your rather special issue.
-Norbert
NI Germany
CEO: What exactly is stopping us from doing this?
Expert: Geometry
Marketing Manager: Just ignore it.

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end if
end tell
end tell

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Not sure if youre after the portchannel bandwidth or port-channel speed... If you really want to get an insight on the bandwidth usage, get SNMP on both sides, actively monitor the port channel and interfaces (real time by frequent polling)
And you could get two endpoints @ 10 gb nics that are bundled, then 'thrash' the link, end to end. I use iperf, you could use big ftp transfers to test and see what performance is. You'll get the rate / speed in which the links are operating 'end to end'
It may mean that the ports are @10gb full duplex, but the overall bandwidth is 20gb
Sent from Cisco Technical Support iPhone App

How to adjust adjacent channel bandwidth to 30 kHz and leave primary at 1.23 MHz

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