PA3CLQ's Leuke Linken Nr. 441


How it's made, radio crystals!

This is a really cool video of how your rockbound rig gets it's rock.

73s & Enjoy! N4IVE - David Gale


Ho, what a grand old film!

It's a great period piece not just for the technology but for the flavour of the times, too.

The girls knew that it would be filming day.

In the later, cleaner, operations, they have worn their finest and have their hair, make-up and finger nail polish all just right down to flowers in their hair!

Even the girl handling that warmed, concentrated chromic acid has worn the smartest, most dainty and feminine apron; it's right out of a magazine!

(For those readers who have not "done" chemistry, chromic acid is seriously bad stuff.

She should have at the least a full face mask and head to toe rubber apron but, tsk, a girl simply can't look dowdy on this day!)

Many thanks, Dave.

John at radio station VE7AOV.

An usefull DIY Frequency Tester 1Hz-50MHz Crystal Counter Meter With Housing Kit less than 10 bucks at:



I have no commercial relationship with this company!



Beste mede amateur,

Dear fellow amateur,
In deze mail staat een link waarop het zesentwintigste DKARS-Magazine is te downloaden.

This mail contains a link which the 26th- DKARS-Magazine is available for download.
De Dutch Kingdom Amateur Radio Society is een stichting die de belangen wenst te behartigen van ALLE radioamateurs binnen het gehele Koninkrijk der Nederlanden.

The Kingdom Dutch Amateur Radio Society is an organization that seeks to represent the interests of ALL radio amateurs throughout the Kingdom of the Netherlands.

De DKARS doet niet aan copyright en het staat een ieder vrij om deze link aan zoveel mogelijk radiovrienden door te sturen.
The DKARS does not copyrighted and any person shall be free to forward this link to as many radio friends.

DKARS Magazine verschijnt 1x per maand en wij stellen het uiteraard op prijs als je ook (radio amateur gerelateerde) bijdrages wilt leveren.
DKARS Magazine appears 1x per month and we obviously appreciate it if you (related radio amateur) to provide contributions.
Namens de Dutch Kingdom Amateur Radio Society wens ik je veel leesplezier nadat je op deze link hebt geklikt:

On behalf of the Dutch Kingdom Amateur Radio Society, I wish you pleasant reading after you click on this link: sept 2016

Wil je in plaats van een PDF te downloaden het Magazine on-line doorbladeren?
Dat kan ook, ga dan naar deze link:

Want to download the magazine browsing on-line instead of a PDF? This can also go to this link:

73 namens de DKARS
Peter de Graaf
Secretaris DKARS


What is It????

Hi All,

The "wirechief" just got a request to identify a "telegraph" item.

I've never seen anything like it before.

It appears to be some kind of adjustable inductive load but whether for telegraph purposes or some other early electrical purpose, I do not know.

I've attached the photo the requestor sent me.

Any ideas...

73, Chris Hausler


That is an early resistance decade.

Used for determining resistance of a wire out to a ground or cross fault as one arm of a bridge with a galvanometer.



Hi Ed,

Thanks!!! I passed on the information.

I also got the following link to info on Wheatstone Bridges.

The first photo looks familiar.

73, Chris

For home page Electrical Measurements see:

For home page Instruments for Natural Philosophy see:




Game Boy ... Telegraph fed.

Washington, D.C., 1924.

 "The latest in electric baseball scoreboards.

George Coleman, inventor, is shown with the mechanism of the new scoreboard."

Harris & Ewing Collection glass negative. 

A backstage view of Washington, D.C., inventor George Coleman's "Lifelike Baseball Scoreboard" (seen earlier here and here), which was set up in movie theaters to "broadcast" the home team's away games.

"It contains 19,000 feet of wire and has 400 stereopticon slides with an electric light bulb for each slide.

Five men are required to operate the great board, including the telegraph operator who receives play-by-play from the field."

QSP: Skip SlowSpeedWireGroup

here is

and here is




Found old picture of two lovely keyers.


Jos ON6WJ SiteSwiperKeyGroup


73, from the town at the rivers "De Bergse Maas" and "De Dongen" Geertruidenberg (800+ years city rights)

your Editor Jan Pieter Oelp PA3CLQ



My simple website about Gigantic DF-Antennas

Part 1 "DF-Antenna Wullenweber Array"

Part 2 "DF-Antenna USSR Variants"

Part 3 "DF-Antenna USA Variant"

Next Part 4 "USSR OTHRA DUGA 1,2 & 3" at: