Resonant Speakers for CW

Resonant Speakers for CW


1. http://kd1jv.qrpradio.com/resonatespkr/CWSPKR.HTM

2. http://www.n5ese.com/res_spkr.htm
a. http://www.n5ese.com/res_spkr_sketch.jpg
  b. http://www.n5ese.com/res_spkr_parts_med.jpg

3. http://www.qsl.net/n5iw/RESONANT.htm

4. http://www.n5ese.com/res_spkr_sketch.jpg

5. http://www.n5ese.com/res_spkr_parts_med.jpg

ZL1CVD, Chris Day, CatDisplay

ZL1CVD, Chris Day,  CatDisplay

Works with Yaesu FT-817, FT817ND, FT-857, FT-857D, FT-897 & FT-897D transceivers.

https://sites.google.com/site/zl1cvd/catdisplay

Rig Expert AA30.uno SWR and Antenna Analyzer Kit

The Rig Expert AA30.uno has been available since, it appears, November 2017

I hadn't seen it before. It is essentially the AA-30 analyzer w/o the case and is supplied as a partial assembly kit.
It can be connected to a PC and can be intyerface to Rig Experts AntScope program.

It can easily be interfaced and controlled by an Arduino CPU. That makes it possible to make all sorts of wireless and remote controlled instruments.

Looks like it can be had for approximatley $80 depending on the vendor.


https://rigexpert.com/news/see-the-aa-30-zero-video-review/

https://rigexpert.com/products/kits-analyzers/aa-30-zero/

Frequency counter using F{GA, STM32 and a Bluetooth Android APP

NANOCOUNTER Frequency counter using F{GA, STM32 and a Bluetooth Android APP

This is from a blog posy Andy's Workshop

I like the idea pof instruments that use a tablet with Bluetooth interface for data display and instrument setup.


http://andybrown.me.uk/2016/02/21/nanocounter

A RUGGEDIZED GENERAL PURPOSE 100 kHz - 2 GHz LOW NOISE RF PREAMPLIFIER by Glen E. Gardner Jr., AA8C

As submitted to QEX/Quarterly Communications for Publication
Published in May-June 2004 QEX

A RUGGEDIZED GENERAL PURPOSE 100KHz-2GHz LOW NOISE RF PREAMPLIFIER
by Glen E. Gardner Jr., AA8C

http://gridtoys.com/preamp/preamp.html

A JFET preamplifer for 50 MHz by AA8C

A JFET preamplifier for 50 MHz
Glen Gardner, AA8C
http://gridtoys.com/6m_preamp/jfet_preamp.html

Possible Replacement for MPF-102/MPF-105 JFET

Possible Replacement for MPF-102/MPF-105 JFET

http://gridtoys.com/6m_preamp/MMBF5457.pdf

https://www.onsemi.com/pub/Collateral/2N5457-D.PDF

Aluminum 40/30/20 meter Square Loop Antenna by AA8C

A MORE EFFICIENT MAGNETIC LOOP ANTENNA

Variations on a Theme Continued

Glen E. Gardner, Jr.

AA8C

http://gridtoys.com/glen/loop/loop3.html

Early 20th Century Magazines and Engineering Proceedings

A very large collection of early 20th century radio magazines and proceedings in pdf format.

http://www.jumpjet.info/#menu

40/80M Direct Conversion REceiver by F6KFT

The "TENOR" receiver 40 / 80m Direct conversion receiver by F6KFT

http://f6kft.free.fr/spip.php?article31

SDR Based Test Equipment

SDR Based Test Equipment
Beric Dunn, K6BEZ
http://www.bay-net.org/docs/baycon2017/rf_test_gear.pdf

Yaesu FT-891 to FLDIGI

How to setup the Yaesu FT-891 to FLDIGI by KD9CJX

https://kd9cjx.wordpress.com/2017/11/22/how-to-setup-the-yaesu-ft-891-to-fldigi/

Mobile Ham Radio

If you are into mobile ham radio check out K0BG's site.
http://www.k0bg.com/

Power/voltage/current meter for a Portable Battery Box Project

I was looking for a power/voltage/current meter for a portable battery box to be used when I operate QRP from local parks picnic bench style. The "power box" would be able to power whichever radio I used:  KX3, FT817, or FT891. I will be using a BioEno 12AH battery(s). The cumulative energy measurement was one capability I wanted.


1. Large Panel-Mount Digital Power Meter - 6.5V to 100VDC up to 20A
It even does some calculations like Watts and cumulative Watt-hours. There is a small recessed button to reset the cumulative measurements.

https://www.adafruit.com/product/3626


2. This Mini Power Meter with Voltage, Current, Watts, mAh & mWh Display
https://www.adafruit.com/product/3624

Old Army Radios from Around the World

http://armyradio.com/Mercury_Radios.html

An RF Inductance Meter by N5ESE

==N5ESE's RF Inductance Meter ==
This meter makes measurements at RF frequencies.

1. http://www.n5ese.com/l-meter.htm

Manhattan Construction Techniques by NA5AN.

Manhattan Construction

Paul Harden, NA5N
http://www.aoc.nrao.edu/~pharden/hobby/HG-MANHAT1.pdf

Web Links for QRP parts, blogs, kits and homebrewing

Miscellaneous Links: QRP, Kits, and Homebrewing
1. http://www.qsl.net/k5bcq/Kits/Kits.html =
Attenuators and 20 W HF AM

QRP Labs
http://qrp-labs.com/qcx

Bitx
http://www.hfsigs.com/
http://www.qrpkits.com/bitx20a.html

NorCal 40 Update
1. https://groups.yahoo.com/neo/groups/qrp-tech/conversations/topics
2. ARRL: The NorCal Sierra: An 80-15 M CW Transceiver http://www.arrl.org/files/file/Technology/tis/info/pdf/96hb1789.pdf

QRPme: Kits, parts, supplies
1. http://www.qrpme.com/

Minima
1. http://www.phonestack.com/farhan/
2. https://sites.google.com/site/ae5phradionotebook/minima_main_page
3. http://www.sarfata.org/ham/downloads/Minima-Pacificon2014-Handout.pdf

Four State QRP
1. http://www.4sqrp.com/kitIndex.php
2. http://www.4sqrp.com/bayouJumper.php

Yahoo Groups
1. https://groups.yahoo.com/neo/groups/QRP-L/conversations/topics

Google Plus QRP and Homebrew
1. https://plus.google.com/communities/118063927587926627177
2. https://plus.google.com/communities/118063927587926627177
3. https://plus.google.com/communities/101567225799677082176

Blogs and Podcasts
1. Solder and Smoke: http://www.soldersmoke.com/  and http://soldersmoke.blogspot.com/
2. Homebrew w/o PCB: https://aa7ee.wordpress.com/
3. SST: https://aa7ee.wordpress.com/2016/09/09/a-scratch-build-of-n6kr-and-wilderness-radios-sst-for-20m/
4. SST: https://vk3hn.wordpress.com/2016/12/27/summit-prowler-two-a-scratch-built-30m-cw-transceiver-wilderness-sst-for-sota/

Reflow Soldering Controller

Reflowduino - Bluetooth Reflow Oven Controller

Reflowduino is a completely open-source Arduino-compatible reflow oven controller with tons of features!

by Timothy Woo

Hackaday Link

Heavy Duty Fiberglass Push-Up Mast Products and Guy Rings

Heavy Duty Fiberglass Push-Up Mast Products and Guy Rings

The guy rings may be useful for other poles to

Fiberglass Masts and Guy Rings

RF Sweep Generators

Here are some links that show how sweep generators can be built and applied. Thesemay be useful if you have an oscilloscope.

RF Sweep Generators

Use a Paper Map to Keep Track of States Workesd

I know logging programs can keep track of this type of information but this method is quick and visual.

Many times there are short term contest or events that I wish to keep track of my contacts by states. Recently I have been working FT-8 trying to get a WAS total with conformations.

I keep track by cross hatching the state when I have worked but not confirmed the state. Once confirmed I shade the state.

Not an original idea by me. A ham got his daughter involved with the hobby by coloring in a similar map to cover states and DX QSOs. A little geography lesson too.

http://www.wparc.us/hints-sub/hints-pdf/was_8x11.gif

IOTA Printable Beam Headings

Need to know where to point your beam for a rare IOTA QSO?

Take a look here.

http://www.mapability.com/ei8ic/iota/iota.php

IOTA Map Page

Wow this is some help in chasing IOTA stations.

IOTA Maps

S-Units Explained

S-Unit Table and Information
Paul NA5N
http://w7dk.org/images/rct_tech/tech_sunit_chart.pdf