KB9JJA

A little bit of everything

QRP AM BroadCast Interference High Pass Filter

An evening project to stop that AM Broadcast Interference that plagues many QRP Rigs

GPS Antenna and Splitter- Future Project

I have multiple items in the lab that needed a GPS antenna connected.

My Statum1 time server
Leo Bodnar GPS Frequency Ref
10 Mhz Frequency Standard
WSPR 6 & 10 Meter Transmitter

I set off to purchase a nice outside antenna and buy a 4-6 way active GPS Splitter. The splitter turned out to be very expensive so I am looking at building one my self.

I am thinking about starting with a Mini Circuits ZC6PD-1900W and modify if to work with the GPS. I need to cover the L1 and L3 bands. I found some info on the net on what it might take.

Bellow are some links I found with info I will use to start my conversion.

https://www.febo.com/pipermail/time-nuts/2017-June/105932.html
http://www.prc68.com/I/4GPS.shtml

LiPo Discharger

A Discharger for 3S Lipo Packs

LiPo-DischargerCrop

LiPo-DischargerCrop

Hacking Hobby King Volt Meter

Hacking the Hobby King RC 3 Digit Volt Meter To read below 3.2 Volts

Circuiters

A fun project with some components

RF Probe

I am putting together a portable work bench.
And Decided I needed to include a simple RF probe.
Here are notes and info I found on the net, and my construction of one.

Jetstream JTPS14M Switching Power Supply Mods

Adding Anderson Power Poles
Modifying Fan Circuitry

Jetstream JTPS35BCM Switching Power Supply Mods

Modifications to my Jetstream 35 Amp Power Supply

Review
Adding Anderson Power Poles
Modifying Fan Circuitry

Anderson Power Poles

Some of my Anderson Power Pole Gadgets

AF Bech Amp

Small and self contained.

AF - RF SIGNAL INJECTOR

Time to retire and old friend, with a smaller unit.

Milli Ohm/Micro Ohm Short Finder

Some times you find your self with a short in a circuit. This device is great for pin pointing the short.

Quick and dirty way to ID unmarked network cables

Its not radio related, but here are some simple tools that I find useful.

Grid Dip Meter

A weekend project to build a grid dip meter

Read More...

Icom PCR-1000 10.7 Mhz IF Tap

How to add a 10.7Mhz IF out to the PCR-1000

NJQRP Clubs Antenna Analyzer Project Micro908

This is a handy tool to have in the shop, and it was a kit too!
101 Uses, well maybe not, but this is a well thought out unit, and simply a joy to use.

2006 ARRL Frequency Measurement Test

This is the first time I ever tried this. It was a lot of fun, and I learned a lot.

Radio Interface Box

A home brew universal RIB Box

Dummy Loads and Attenuators

You can never have too many Dummy's and Attenuators In the Shack!

M3 Universal Freqency Counter / Power Meter

M3 Power Meter

Sound Card Interface for the TS-2000

A interface specifically built for the TS-2000

Crystal Tester

My version of a crystal tester.
And circuit board for the project.

Rock Mite CW Tranceiver

Another fine kit from Small Wonder Labs

Keyers and keys

Some of my keyers and keys

NJQRP Sniffer

A Tunable, Multiband Field Strength Meter.
The Kit is no longer available, but do not let that stop you from building it!

Small Wonder Labs SW 40

The SW-40 is a wonderful kit, and a nice rig to operate.
If you want to lean a bunch and like to mod your rigs this is a nice little rig to play with.

M3 Semiconductor Analyzer Kit

A few simple modifications make it more user friendly.

AADE L/C Meter IIB

This kit sure does come in handy on the work bench.
Some simple modifications make it more enjoyable to use.

Lithium Polymer Cell Balancer

A simple way to manually keep Lithium Cells Balanced

Lithium Ion / Polymer Battery Chargers

Lithium Ion / Polymer Battery Charger Circuit Boards

RapidWeaver Icon

Made in RapidWeaver