73 Amateur Radio Today – January 1993
Issue Contents:
The Techno-whizzy 1 Part II
– Build a direct digital synthesis (DDS) transmitter …… N9JZW 10
Programmable-frequency Audio Generator
– High accuracy with digital control …… Redman 16
The SP-1 Transceiver
– Build the HF “Spider” …… WA8TXT 24
Twin Crystal Ladder Filters
– Upper or lower sideband filters using inexpensive crystals …… N2DCH 32
Handi-beacon
– Turn your tape recorder into a beacon controller …… WB9YBM 38
The Down East Microwave OEM 432K
– Put your HF rig on the 70cm band with this easy-to-build linear transverter kit …… KT2B 36
The SR4 Multimode Simplex Repeater
– The next generation of store-and-forward voice controllers …… WA3USG
73 Amateur Radio Today – January 1993
