|
HamRx - 144-146 MHz synthesized FM receiver (circuit added 08/07/06)
|
|
HDT Technology Adds Power to CDMA Chip Set - RF Micro Devices App Note TA0003
(added 02/05) |
|
How to Build a 300MHz AM RF Remote Control System - (electronic circuit added
4/05) |
|
I.F. Amplifier - The I.F. transformer primary has 18 turns, the secondary winding
has 4 turns. The capacitors across the IFT primaries are 82pF. The input/output
transformer has 12 turns, tapped at 3 turns from ground. This transformer is wound on
a ferrite core. The mosfets are 3SK45's. The diodes in the product detector are
1N34's. I use a six pole SSB filter from a scrap CB. The centre frequency is 7.8MHz.
The -6db bandwidth is about 2.5KHz. (added 02/05) |
|
ICOM CI-V interface with RS232 RTS to PTT - This page describes my home-built ICOM
CI-V interface. In order to connect most all ICOM radios to a computer, an additional
interface is required. The interface bridges the gap between the RS-232 electrical
levels used by the computer serial port, and the open collector shared bus used
by the ICOM radios. The interface, therefore, is not much more than a level
converter....(diagram added 05/06/07) |
|
IF Amplifier Circuit - Three of these amplifiers are used in series to build the
455 kHz IF amplifier. AGC voltage comes from the AGC Circuit. The diagram above shows
the circuit for the second IF amplifier. (added 02/05) |
|
Improved CMOS RF PLL sythesizer - (diagram added 05/06/07) |
|
Kenwood TR-7950 manual & schematics - (diagram added 05/06/07) |
