*     HF2001 Double conversion 0 - 30 MHz Continuos coverage  HF Transceiver - I6WJB - I6YPK 

                                                        (Only in Italian language for now, sorry, but take a look at the schematic anyway!)

* HF1 Triple conversion 0 - 30 MHz Continuos coverage HF TRANSCEIVER - I6WJB - I6YPK

* HP Journal articles online:  HP141 Spectrum Analyzer - HP8568A Spectrum Analyzer - HP4396A Vector Network Analyzer

* HP Z3801A Frequency Standard (this page is available only in Italian). For English page please visit :

   K8CU site :  http://www.realhamradio.com/GPS_Frequency_Standard.htm