Description: This is a project to build a fox transmitter that uses the third harmonic of a 49.3 MHz computer clock osc unit with a three pole high pass filter. The output is 15 milliwatts. A 555 is on the board for a tone oscillator.
ARRL HB CHP 25 FIG 72
Description: The project is an 8-stage attenuator for the front of a receiver to aid in transmitter hunting. The pc boards supplied are pre cut to be soldered together to form the box with individual dividers between each switch. The top is cut out to mount slide switches. The switches provide (3) 20db, 10db, 5db, 3db, 2db and 1db steps of attenuation. The handbook describes the resistor values for the Pi network or T network configurations.
QST MAY 93
Description: This is a direction finder that has a butterfly antenna mounted on the P C Board. It uses the phased audio from a FM or AM receiver produced by the switching of the antenna to indicate a front to back direct. The unit will work in a 45 to 470 MHz radio.
TRANSMITTER HUNTING BY JOSEPH MOELL
Description: This is a Roanoke Doppler DF unit that uses three boards, a main board, 16 circular LED display board and a antenna switch board. The antenna switch board is the circuit that Joe published in his 73s column that does not require the 1/4 wave feed lines. The display board uses a 4514, three 75492s and 16 LEDs. The main board uses two LM324, a CD4051, two 555, CD4049, 74LS75, 7445, CD4024, CD4028, and LM7805 ICs.
Comment: Perry Scott, KB0MCB, reports that he and several friends have built this and says it works great.
Comment: Ian Ashford G8PWE, reports: "Went together well no faults found. Construction skill level -beginner. The only problem with this design were the LED driver IC's. I had some success with specialist obsolete parts suppliers, they were not expensive. The new wideband switcher works very well. I used cheap out of spec PIN diodes from a UK supplier called J Birkett Electronics. (I understand Fair Radio sales in US has similar setup)"
Description: A low cost Doppler to (RS232) APRS Interface designed by Swain KA4JSR/N7LUE. Complete description with schematics and parts list can be viewed at http://members.aol.com/joek0ov/dopp2aprs.html.
Description: This is a two board (main board and display board) Doppler project that uses the Moell antenna switch board. The project uses 4 IC's: PIC16C72, MAX294, MAX494, and 74HC4051. Complete details can be viewed at http://www.colba.net/~jacbro/picproj.html.
Description: This is the PC Board and Programmed PIC processor for a 32 circular LED display Doppler DF project. I have seen this one and it works great and was made in a small (4"x4"x 1") package by the designer. The project uses a PIC processor and 4 other IC's. The circuit has an audio filer that uses two MAX IC's. The circuit will work with the Moell antenna switch board which is included. Package includes Documentation, three PC boards and programmed PIC processor. Details can be found at http://www.colba.net/~jacbro/index.html
Comment: Ian Ashford G8PWE, reports: "I was astounded by the performance of this unit compared with the Roanoke! (probably due to the inbuilt PIC processor for the display) Construction level -advanced. Component sourcing ..no problem (Jaques mailed me the PIC).The unit worked well. I used your Roanoke Wideband switcher with this design with no problems. The PCB is so small I mounted them back to back vertically.This makes for a very compact dashmounted unit -ideal for the smaller vehicle!"
2 METER ARDF FOX TRANSMITTER FOR ZONE 2
Description: This is the CW ID Montreal Fox Controller by VE2EMM. The board uses a 16F84 PIC, a P Channel MOS FET, 2N4427, 78M05, ICS501 LOCO PLL Clock, and a 4.194304 Crystal. This is a self contained FOX CW Id'er and 2 Meter FM Transmitter. Complete description can be seen at: http://www.colba.net/~jacbro/index/projpic/mfox/mfox1wat.html
Description: This is the PIC controller for a FOX transmitter with MCW and CW outputs. Circuit uses a 16F84 pic, a 4.194304 MHz crystal, and a 78L05 and is built on a 2"x2.5" board. Complete details can be seen at : http://www.colba.net/~jacbro/index/projpic/mtfoxctr/mtl_fox.html
Description: Circuit uses PIC16F84 PIC processor Crystal, transistor, and two LED's, see www.byonics.com/tinytrak for complete details and code for the PIC
Description: This is a simple crystal controller 80 meter Fox transmitter with a 50% duty cycle of CW carrier and 3-5 watts out. Project uses a 4001, and IRF610 transistor and is built on a 2" by 1 3/8" board. Details can be found at www.colba.net/~jacbro/index/projpic/picproj.html
Description: This is Jacques new Doppler DF unit, using a PIC, MX232 and MX492 ICs. See http://www.colba.net/~jacbro/ for complete description.
Description: This unit uses two antennas and runs off 9 VDC. The circuit requires (2) AT90S1200A uPs and a MF10 IC. PROGRAMMED IC's (AT90S1200A) are available from Tom Wheeler, 11224 Holmes Rd. Room 208, Kansas City, Mo. 64131
Description: This is a two-microprocessor DF unit with 18 LED circular display. The project is on three single sided p c boards: main board, display board, and an antenna switch board. The main board is 3.2" by 3.2" and consists of (2) Atmel AT90S1200A processors, MF10 audio filter, LM336, and 78L05. The two programmed microprocessors are available from N0GSG. Source code available at http://faculty.kc.devry.edu/twheeler/projects. The display board, 2.4" by 2.4", mounts the LEDs. The antenna switchboard is 2" by 2". Boards are sold in sets only.