FAQs

Q: The first character in my transmitted message is corrupted. After keying the transmitter module do I need to pause before I input my data and if so, for how long?

A synthesised radio transmitter module like the Wood & Douglas ST500 requires a certain amount of time to reach its specified operating levels. This is mainly due to the high frequency oscillator which needs to stabilise at its programmed frequency.

 

As a general rule of thumb, the RF stages in a transmitter would be expected to be within specified limits 50ms after TX-on is enabled. You should therefore hold off inputting data to the radio modules until 50ms after transmitter key-up. Ignoring this will mean that the first bits of the first byte of your message will not be heard by the receiving equipment.

 

It is good engineering practice to pause a short while after the last character is transmitted as well. 10ms is a commonly used value for this TX-hold on function.

Img

Related Products:

Here are range of other products
you may be interested in:
  • There are no products related to this FAQ

Our Markets

Here are a range of other markets you may be interested in:

We can all learn from asking questions so why not ask us a question so that we can all learn together.

Quick question ?

Ask our sales team a quick question

Please include your contact details.