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What is electric field distribution around two conductor cable connected to DC power supply? Assume power supply is isolated and not grounded. Assume cable is straight. Case 1: no current runs through the cable. One wire is positive, another – negative. Negative or zero? If we think in terms of...

I believe I know these types of motion sensors at 10.525GHz. Not to 1 degree but it was never stated beam has to be 1 deg. Parabolic reflector will do wonders and even tin can properly positioned will give respectful directionality.

>> Go to a heavy truck parts supplier or a diesel engine parts supplier. Look for a starter solenoid ... Thank you, good advice! And I did ... an learned that starter solenoids are often intermittent duty and i need continuous one. Nothing is easy but this is right direction.

Thank you everybody for comments and suggestions. This really makes good thinking reference for me. To answer the questions: the motor start once and be kept in continuous operation the entire time the vessel is underway. The motor will start with minimal load - when the system is not engaged...

The motor is powered up from large 24v battery. It drives a pump. The application is marine steering gear.

What is proper way to start 1hp 24V DC Motor? Permanent magnet type. Can I just use contactor with sufficiently high current rating? (like, 100A, this is what my boss wants) Or do I need to rig resistive ladder and use multiple contactors? (I see lot's of literature on that, mostly old) Or do I...

Thank you everybody for sharing opinions. Basically you proved that my idea was possible however I did not win and system with hydraulic accumulator will be used to provide required hydraulic 'pulses'.

You mentioned your special motors KllrWolf. Are fluid filled motors any better then regular 3 phase inductance motors for applications with rapid changes of motor operation?

Hello, Can 50HP motor be accelerated in 1 second from zero to full speed? And then decelerated in 1 second time? This question may sound naïve but this is really what I need to figure out. The RPM value is not important as I learned. The motor will be driving the pump and the pump is...

Basically oyu are talking about using dielectric lens. Interesting idea even though I afraid it will be losses. Meanwhile I experimented using conductive scatterers. I simulated single patch (the antenna is 16 patches) and found out that i can adjust effectively pattern of one polarization but...

The antenna in question is dual polarized directional Panel, operates at 5GHz ISM band. Horizontal beamwidth 60 degrees. How to modify the pattern to make beamwidth ~120 deg (both polarizations) without disturbing radiating structure (structure is corporate-fed unidirectional patch array)? Is...

to DenVo: I think you are correct in the essence of your warning though: the designer should watch for elliptical polarization. It is easy to get it elliptical by cutting the opposite corners of the patch but there is only one size of the cuts when polarization becomes circular.

I did some modeling: we can get you Circularly polarized 9 dBic Gain at 915 MHz if footprint/ ground plane will be 250 x 250 mm. If you still did not find your solution I offer to construct and send you hand-made prototype for small fee. Tuned properly. It will be suspended plate, truncated...

I can construct suspended plate configuration with narrow ground plane resulting in 120 deg. beam width and gain ~ 6 dBi. Gain can be further increased by making an array of plates ... Such design will be feasible on UHF... MacGyver is right - you need to explain what you want: your operating...

Friends, Thank you for all your comments! I should say that the Control system is not the cause of the problem since I observe exactly the same vibration either I use control system or manually switch the valves on/off. (electronically manually, with a switch.) >> have you checked for air in...

Hello desertfox and hydtools! What means 'cylinders binding on operation'? >> Is this a new problem? Has the system always vibrated? The system always vibrated Is it any practical way to diagnose air in the system?

Please help me to figure out hydraulic problem – I am not hydraulics expert. I got large ship steering system: tiller operated with two cylinders, controlled by directional valve. When the valve closes the rudder vibrates instead of stopping abruptly - makes several minute oscillations...

>> Why CANbus are you going to interface directly with another system or is it your preferred network for your remote IO. I am tasked to create network based on CANbus. One specific piece of equipment, Rudder Angle Indicator interfaces through CANopen and not another Network. I need to set...

Spoke with Siemens - they do not offer CANbus functionality. "... some equipment can be interfaced using 3d party hardware"

My requirements are actually quite modest: I need single controller and 3 clusters of I/O's with up to 20 digital I/O's (mixed in different combination) per cluster and 2 Analog 10 bit Inputs per cluster. Power: 24V. Graphical method of programming. Right now I use Siemens LOGO! PLC's and in...