VLF upconverter

Many people want to take a peek at what is on VLF. The problem is that many receivers do not tune that low. One answer is an upconverter so that VLF is translated to a frequency covered by a conventional receiver. 

For amateur VLF signals, this is extremely unlikely to be useful as VLF amateur signals need great frequency accuracy, extremely narrow bandwidths and long integration periods measured in hours or days. 

For VLF utility stations this upconverter will be useful.

See https://sites.google.com/view/g3xbm4/home/vlf/vlf-converter