Are there hams in countries who are not in your so-called "technology jail," who are using ultra wide bandwidth HF modes?
What other HF modes are being used or proposed that we can not use here in the U.S. that require changes to our regulations? 73, Rick, KV9U expeditionradio wrote: > > It isn't necessary to use an SDR. You can modify a standard hardware > transceiver with wide bandwidth filters. It is simple. Obtain a new > wide bandwidth filter of the proper bandwidth and frequency, such as > 25kHz bandwidth or 250kHz bandwidth. Install it in one of the filter > options, or remove the original filter and install the new one. Other > types of switching can be used as well. > > For transmit, tap into the balanced modulator directly with a high > value series resistor, and run this directly to a shielded cable to an > add a jack on the radio for it. This connects to the soundcard speaker > output. > For receive, add a small high impedance amplifier on a rider board > inside the radio, and use a high value series resistor tapped into the > product detector. Run this directly to a shielded cable to an add a > jack on the radio for it. This connects to the line input of the > soundcard. > > Bonnie KQ6XA > >
