FAQ

I will expand this section as questions come in.

If you have any question, please feel free to contact me by email at steamingcoax@gmail.com !

Thanks!

• Can I still buy one?

No. As the DWM V1 was very difficult to manufacture efficiently and lacked several capabilities.

Fear not! The DWM V2 will be available soon!

• Can the DWM be used for both 30uA and 100uA elements?

Yes! To switch between 30uA mode and 100uA mode, you must set the two jumpers on the board to either the "30uA" or "100uA" setting. Then go to the Configure option by entering into Main Menu -> Configure -> Meter Sel, then choose the desired meter type.

Don't forget to set the element's memory slot calibration to match the elements type (30uA or 100uA)!

• How do I perform a return loss measurment?

1. Press and hold the Up Arrow and Down Arrow buttons simultaneously for 1 second, then release.

2. Rotate the element in the line section 180 degrees to measure the opposing direction of power.

When the two Up and Down buttons are released when going into the return loss measurement mode, a reference power will be captured and displayed at the bottom of the screen.

To leave the return loss menu, press and hold the Up Arrow and Down Arrow buttons for 1 second and release.

Note: A negative return loss means an increase in power has been observed and a positive return loss means a decrease in power has been observed relative to the reference power.

• How do I use the output interlock relay to protect my transmitter?

Here's how:

1. Go to Main Menu -> Interlock -> Level, then set the desired trigger power level limit.

2. Then go to Main Menu -> Interlock -> Type/En, then select Lo Power to trigger the interlock when a power level below the trigger level have been reached or Hi Power to trigger the interlock when a power level above the trigger level has been reached.

3. Then save by going to Main Menu -> Save.

To reset the interlock relay state, press and hold the ENTER button when in the main power viewing mode until the message "STAT RESET" appears, then release the button. Also, power cycling the device will also work to reset the interlock relay state.

• Can the DWM work with elements made by Coaxial Dynamics?

Yes! All Coaxial Dynamics elements are 30uA output desinged to be interoperable with Bird 30uA meters.

• What is the sample rate?

The sample rate of the current version of board is 7.5KHz. 

This means the DWM can reliably detect pulses as narrow as 150us.