State of the ARRL and US Ham Radio

You will find some interesting points and data on the state of the ARRL and USA Ham Radio here:

Log Potentiometer Options

 If you need to have a log responding pot this idea may be of help:

Log Pots

AC2CZ 50 watt Amplifier Design Article

 A nice description of AC2CZ's 50 watt amplifier design project.

50 W Power Amp

VA3ASE Satellite Antenna System

 I just viewed this YouTube version of Alex's, VA3ASE, satellite antenna system. This is part one.

VA3ASE Satellite Antenna System-Part 1

10x Scope Probes: Teledyne LeCroy

Here is a short application note that covers 10x oscilliscope probes.

Teledyne LeCroy 10x Probe Application Note

A pdf version is also available.

KN5L Blog Covers RF, Chokes, Transmission. Lines and Theory

 KN5L has a very interesting blog that covers RF. transmission lines and filters/chokes with examples, practical data and theory.

KN5L

Lloyd Butler, VK5BR Website

I suggest anyone interesred in test and measurment, antenna tuning/matching peruse the articles of VK5BR.

SITE of LLOYD BUTLER VK5BR Many articles by Lloyd Butler VK5BR have been published in journals, including Amateur Radio and OTN since the 1980's. The site has been set up to display some of the material published.

WSPR article: A WHISPER (WSPR) ADVENTURE and ESP_WSPR by BARBAROS AŞUROĞLU

 Interesting very low power WSPR project by  BARBAROS AŞUROĞLU

WSPR

Miniwhip Antenna by PA3FWM

Nice description of a miniwhip SDR receive antenna

PA3FWM miniwhip

Old Callbooks

 Before the internet if you wanted to know the address of a HAM you would refer to the Paper Callbook.

Someone has scanned them for download at:

https://leehite.org/callbooks/

PI and SDR

 Raspberry Pi SDR Cyberdeck174301-raspberry-pi-sdr-cyberdeck

I/Q Signal Tutorial

 Here is a tutorial from GNU Radio describing I/Q signals.

I/Q Signal Tutorial

French national amateur radio society REF

REF Digital Library Available  French national amateur radio society REF have made available their digital library covering antennas and other ham topics. REF Library

AMSAT Live OSCAR Satellite Status Page

 AMSAT Live OSCAR Satellite Status Page

AMSAT Satellite Status

EME Station by Fred, AB1OC

 EME Station by Fred, AB1OC

Here is a nice 10-part blog post describing a EME station from design and planning through antennas on the tower.

EME Station Design and Construction

G7UHN has built a very useful additional display for the FT-817/818 transceiver.

 

Andy,  G7UHN has built a very useful additional display for the FT-817/818 transceiver.

T-817 Display Accessory 

SDR Software Tutorial

This is quite interesting as it shows how software is written for SDR radios. It is from the AC2CZ web.

SDR Radio Software Tutorial

High Voltage Transformer Winding Information

High Voltage Transformer Winding Information

Transformer winding

KF8OD has some examples of homemade transformers.

Transformer Build

Amateur Radio Magazine from the American Radio Relay League - Early Issues

Scanned QST issues covering 191 to 1949.

https://www.americanradiohistory.com/QST.htm

RFI Site Survey Using an SDR by NK7Z

NKZ uses an SDR monitor a wideband width over 24 hours to determine possible sources of RFI.

RFI Site Survey Using SDR by NK7z.net