ARRL 600m Experiment Group
WD2XSH/34 Station Licensed to WØRPK
Rural Indianola, Iowa EN31fk
Ralph Wallio, WØRPK W0RPK@netINS.net
WD2XSH/34 is being developed as a portable 600m digital station for ARES message handling.
See http://www.500kc.com/ for extensive information about the much larger 600m experiment.
See http://www.500kc.com/W0RPK_Report/W0RPK_Report.htm for daily 600m activity updates.
The WD2XSH/34 station is currently operating in a breadboard configuration. To the left is the PSK600, a modification of a Small Wonder Labs PSK20/30/40 digital transceiver with 2W output power (http://www.smallwonderlabs.com/). In the center is the EB63-600 linear amplifier, a modification of the Communications Concepts EB63 semi-kit with 100+W output power (http://www.communication-concepts.com/). To the right is a DIY low-pass filter. All of these modules were jointly developed with Fred Temple, KN8AZN (WD2XSH/29).
The transmit antenna includes a 20ft vertical radiating element with a ~360uH loading coil at the top, 4ea 40ft capacitive-hat loading wires drooping down to 10ft height at the far ends and 32ea 40ft radial wires. Feed-point matching at the base of the antenna is 12,000pF of fixed shunt capacitance. The base insulator is a modified Hustler BTV mount.
WD2XSH/34 uses two receive antennas including a DIY 8ft amplified shielded loop,
see http://members.shaw.ca/ve7sl/burhans.html for details.
The second receive antenna is a DIY amplified whip based on an AMRAD design,
see http://www.arrl.org/tis/info/pdf/0109031.pdf for details.
The circuit has been slightly modified to use an inexpensive J310 FET and 12VDC.