ARRL HB CHP 31 FIG 38
Description: The project is a linear up converter for a 28 MHz transmitter and requires 1 watt drive for 3 watts output on 6 meters (+22MHz up converter). The board has a 22 MHz oscillator, an SRA-1 doubly balanced mixer and four gain stages at 6 meters. The transistor line up is 2N5179, (2) 2N5109's, and MRF476 with an on board low pass output filter harmonic filter and a bandpass filter after the mixer.
Description: These are separate converters that
use the same PC Board to build either a 2 or 6 meter converter. Both
circuits use a NE602 followed with a 10.7 IF transformer and a
separate Clock osc for the LO. The 2 meter converter has an
additional 74AC86 to generate the fourth harmonic from a 32Mhz clock
osc. The output of the 2 meter converter is 16 to 20Mhz and the 6
meter is 10 to 14mhz. These converters make a simple way to receive 6
or 2 meters with your general coverage receiver.
Description: This is a down converter that converts wide band TV signals in the 420 to 440Mhz (70-cm amateur TV) to a 61.25 or 67.25Mhz IF, which is TV Ch 3 or 4. Circuit consists of a low-noise dual-gate MESFET RF amplifier, mixer, tunable local osc., feedback-pair IF preamp. Over all converter gain is 37-43 dB.
Description: This project is a transverter for converting the receiver and transmitter of 28 to 30 Mhz to 144 Mhz. The project is built on three PC boards. Receiver converter gain=18db, Transmitter output=10 watts, IM=>80 db. The receiver line up is: BF981, (2) BFY90, 78L08, MSA0404, 116 Mhz 5th overtone crystal, SBL-1. Transmitter line up: J310, BFR96,(2) DB136, (2) MSA0204, CA3140,NE555, BA479, (2) 1N4148, SBL-1. Power amp line up: (2) 1N4148, M57713 Mitsubishi module, 78S09. Each of the sections (receiver, transmitter, PA) are built on a separate board.
QEX Mar/Apr 00
Description: This is a 4.5" by 4.5" double sided non plated through G-10 board per the artwork in the QEX article. The board uses a LF353 op amp, a Motorola MCD12179D PLL IC, a POS-2000 VCO, LM317 regulator, SB-11 mixer, 6.068 Mhz crystal, and a MAR-3 front end amplifier. The circuit receives at 1691 MHz and down converts to 137.5 MHz.
Description: This is a converter to convert the VLF/LF bands up to 2 to 14 Mhz. The project has three boards, power supply, (from the AMRAD active antenna project in QST Sep01), a filter board, and the converter board. The converter board uses 74HC4053, 74HC04 and 78L05. The 4 Mhz crystal is available from Far Circuits for $1.50 each.
QEX Jul93 (Also CHP17-88 IN 95 HB)
Description: This is a three board set, two boards are 4.25"x6.25, and one board is 3.5"x6.25". The design is by Zack Lau. The more detailed description is in the 7/93 issue of QEX. The project transverts 28Mhz up to 220Mhz.
AMSAT JOURNAL May/Jun03
Description: This is a kit of three boards with plated through holes and all the surface mount resistors, capacitors, SM inductors and a 7808. See VE2ZAZ web site (http://ve2zaz.net/23cmcvtr/23cmcvtr.htm ) for additional details.
Description: Down converter designed by Steve Ford at ARRL to convert a 445Khz IF signal to 12Khz for computer sound card. Check out his article, all the software is available. Kit includes NE602, 78L05 and PC Board.