CCWN 75:42
                                                     
same level, the desired signal was completely inaudible without
processing through the CCW filter. At this point the builder will
become extremely enthusiastic about the CCW system and begin to
grasp its potential from a practical operating standpoint rather
than as a theoretical concept.          On the Air: From this
point it is just a short step to actual on the air operation. An
antenna should be connected, using the best possible antenna
system because of the low power level. All components are
interconnected as shown in schematic 7, and power applied. To
transmit, the OFFSET and TRANSMIT-RECEIVE switch on the TEN-TEC
must be set to transmit, and the VFO adjusted for lock as
indicated on the VTVM, monitor receiver, or frequency counter. To
begin a transmission, send a continuous stream of dits for at
least 30 seconds to allow phasing adjustments by the distant
operator. Once you have sent this signal, your transmission can
begin, just as a normal QSO. Under severe conditions, this
phasing signal may be sent at intervals as necessary.         
Receiving requires that you switch back to receive on both the
TEN-TEC and the OFFSET switch mounted on the panel. The loop must
be adjusted for lock on either 3551 or 3549 Khz. By this time the
distant station will be sending a phase signal to you. Adjust the
10 step phase control on your CCW filter for maximum clarity and
insure your audio level from the receiver to the filter input is
not over the reference level determined in testing.         
Conclusions: While the TEN-TEC CCW station is certainly not the
ultimate state of the art system, it does work and give you a
chance to investigate a fascinating frontier of amateur radio at
minimal cost. The standard, keyer, filter and stabilizer can be
retained for CCW use in more sophisticated CCW stations at higher
power levels. The station described and pictured in this article
was used by WA7ZVC/WA4MTP in the first recorded CCW QSO - a QRPP
contact on 3550.00 Khz with W7GHM in January 1975 over a 100 mile
pa.h. Up to date CCW activity is detailed in the CCW Newsletter
describing the efforts of a number of amateurs in this
interesting facet of amateur communications.