Many operators prefer a separate PTT to each of their amplifiers / LNAs. Here the single PTT is extended to a PTT per band.
The GPS Disciplined Reference Generator GPSD-2 is designed to provide accurate and stable 10MHz frequency locking for microwave digital phase locked loops, VHF/UHF radios, and test equipment.
Five port 10MHz distribution amplifier. LPF included for sinewave or bypass for square wave. Currently available with different PCB.
PC time synchronization for digital mode operation using NMEA Sentences from a GPS receiver e.g. GPSD-2.
An explanation of the IC9700 frequency stability issue, firmware revisions, the connection of 10MHz external reference, AutoSync feature, and injection locking with the RefGen-9700.
Explains the operation of injection locking to provide high accuracy and stability for the IC9700 transceiver.
While written for RefGen-9700 module (49.152MHz and external 10Mhz reference to RefIn), these notes provide guidance to check and benchmark other injection lock solutions.
Explains how to connect an external GPS receiver by RS-232 data and how to configure the radio for time, position, and grid locator.
RefGen module, a programmable oscillator locked to an external 10MHz reference, provides reference frequency for a range of Icom and other (TS2000, …). Radio is frequency locked when 10MHz is available else runs from radios internal oscillator.
These notes explain Icom Radio CI-V protocol, CT17 interfaces for hardware and PC Application. Interfaces for IC9700, IC9100, and IC910H PTT Extender are addressed.
The document is not a complete CI-V tutorial. Links to other references are provided.
Safe way to add an RF Tap for 2m band for an IC746Pro / IC7400. Low cost RF amp as splitter.
A safe way to add an RF Tap for all bands for an IC7300. Refer RF Tap IC746Pro / IC7400 for details of splitter amplifier.
A safe way to add an RF Tap for all bands for an IC910H / IC9100. Refer RF Tap IC746Pro / IC7400 for details of splitter amplifier.
PTRX-9700 Panadapter providing RF and IF output from Ic9700 for external SDR. Notes include 10MHz Reference input and coexistence with RefGen-9700 injection locking module.
Using External ALC to suppress transmitter spike on initial press-to-talk. Presents typical transmit spike on PTT in IC910H
This Nano based controller / sequencer provides monitoring, protection, and sequencing for my SSPA projects. The controller is integrated with the power amplifier for ease of monitoring and control. Sequencing includes switching of power for a masthead LNA.
Simple low-cost fan speed controller using step-down DC-DC converter and NTC.
A design with construction photos and test results for a 6m (50MHz) low pass filter used on a Larcan 400W + solid state amplifier.
Constructions for high power based on experience with a popular design.
A design for a M-derived low pass filter capable of handling 400W.
Building a 23cm LPF with lumped L & C can be difficult and rarely repeatable. This design uses microstrip techniques to achieve a high-power filter. References and example calculations are included to design to meet your requirements.
Home brew VHF/UHF reflectometer built from Larcan splitter combiner scrap. Up to 1kW. Repeatable with care.
Describes a stepper motor and rotator control system for tracking sun or moon from data from WSJT tracking data. PC application extracts of data from WSJT azel.dat and sends commands to Arduino processor which controls stepper motor or rotators.
Describes a surplus Marine Satellite TV dish project adapting the 30inch dish for 10GHz EME operation.
Describes extension of the TimeSyncandTracking PC application and rotator controller for KenPro and Yaesu azimuth and elevation rotators.
Modification to rotate the polarization of a RD-5G30-LW dish RocketDish Datasheet (ubnt.com) for horizontal and vertical polarization.
These notes describe a unit conceived by John VK4MJF as an increase of power output for his IC905 for field days. Center piece was a 2.4-2.5GHz 10W Output RF Power Amp 40dB 24-28V. A$100 from Shenzhen, China.
VK4AMG 