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I've registered and received an FRN applied under as a Foregn Entity. For 450-455MHz is says Fixed Mobile for the Radio frequency Spectrum allocation would that cover transmission of RTK corrections for from a fixed base for conducting a survey? I'm trying to select the service option for a...

Hi, could some one advice on wha the requirments for transmitting on UHF 2 450 - 470 MHz for Indiana US. Whats the power limit before a license is required. Is there a specific band width to use 12.5 or 25KHz. Thanks Paul

Thanks, I'm now looking at a SN74LVC1G06DCKT Chip, I was recommended to use a SOT23 Package as this was going to be a hand solder job and the package already assigned would be very difficult. I've looked at the data sheet and Eagle Packages but am unsure of what the correct package to use is and...

Hi,instead I've moved my SMD device to the bottom layer by clicking move, then switching to the bottom layer which I think is the equivalent of mirroing. And Managed to link my via's to the GND Plane by renaming to GND. almost finishded, but when I print on a 1 to 1 scale I checked to see if my...

With the routing I've connected between the top and bottom layer with vias for some signal lines where I've had to route this way due to cross-overs. Some of these where to SMD on the top layer of the board for a 6-position connector. Can I tap in right at the pin so that the top and bottom...

Hi Keith, managed to fix it, I'd changed the grid fromt the defaut 0.1 in both symbol and package when I created my custom devices and it didn't like it when I connected them together. Fixed any way after I redesign my devices with the default grid. I'm just doing the routing now, for defining...

Hi, I've made up my custom connectors. Then I've made up my schematic, which includes a buffer chip. But when I go to board view I don't see any air wires between anything. Not usre if there something to make them show or I've done something incorretly with layers or something for things not to...

Are TNC swtiches easily available could only see one's for coax, and is there relays avaialbe in TNC type. The jumper sounds like a great idea. So from what your saying I just have a 3 two connectors on the base of the box, one is directly connected to the TNC connector on the top of the box for...

The radio would be used for reception only but not at just a single frequency. It would be used at any frequency from 450 to 470 MHz (UHF 2). Thanks Paul

If the secondary antenna with the 1 meter cable wasn't in use this would be disconnected from the bottom of the system/box that it attaches to. Within the box there would be a TNC T-adapter on a short lead of say 5 cm to the radio then the TNC cables to primary and secondary TNC Antenna...

And its a TNC T-Adapter I was refereing to for linking the Radio to the two different antenna positions. Thanks Paul

Hi I was going to use a TNC Adapter to link antenna's to a Radio so that I have the choice of two antenna mounting positions. TNC directly on top of the system/box for 2.4db whip antenna and underneath the system/box for a secdondary to attach a 1 meter cable to, for a larger antenna such as a...

Hi Keith thanks for that, got a little stuck when it wouldn't except just putting in one value for the size i.e. Smd Size 0.066. But then I just entered it as Smd Size 0.066 x 0.066 and that was accepted, then I got my round Pad I wanted. Just have to do the second bit when I get to that stage...

Thanks Brian didn't realise there was a set of application notes to compliment the data sheet. Using this it was easy to calculate the SMD Resistor for solder pad mounting on the back to bring it step down to 20VDC I needed. Thanks Paul

Also for my design I've got a 12-position interface connector on the PCB which then routes to a circular pattern for 12 drill holes with pads to solder wires to in order to route signal lines for a flying lead. For the connector I'm using I have 3x 22 AWG wires for Postive supply and another 3...

Hi I'm trying to create an Solid Round Pads to take a SMD 6-Position Connector with round pins with PCB Teriminations. I see pads but that has a drill size in properties and there's no option to turn the drill size off or set it to 0. Thanks Paul

Hi, how do I set the voltage up for this DC/DC converter,8.5-36Vin,12Vo 15A,180W http://uk.rs-online.com/web/p/isolated-dc-dc-converters/7541438/ I'm looking for an output of 20VDC from an Input of 12VDC. Is there a set of instructions usually for something like this? thanks Paul

Hi, I'm looking at supplying 4.3A through a 19way connector, each crimp can accept max wire size of 22 AWG. I was looking at an AWG able to check the current ratings, for 22 AWG: in air 7A and in jacket 0.92A, so does that mean to get the 4.3A its 4.3/0.92 = 4.67, therefore I need 5 22 AWG wires...

The board's supplying 12V for the encoder port so sticking with an encoder that has a suitable input range to accept this and this helps avoid the problem you mention about increased noise due to the lower voltage and also avoids the need to use a DC-DC voltage converter to provide 5V from the...

Hi Thanks for the replies, I got some what confused thou over someone terming an encoder non quadrature, I was thinking this was some specific/special type of encoder which wasn't the case. My understanding is clearer now on how the encoders are supplied with a resolution or PPR. Then say by...