Search found 494 matches

by VK3YE
Sat Feb 02, 2019 9:29 pm
Forum: 144 & 432 MHz
Topic: 144 MHz with crystal oscillator modules
Replies: 0
Views: 6333

144 MHz with crystal oscillator modules

Some crude transmitter experiments



by VK3YE
Sat Feb 02, 2019 9:17 pm
Forum: General Discussion
Topic: What's on your Workbench?
Replies: 610
Views: 83611

Re: What's on your Workbench?

Transmit a TV picture with a 1N4148 diode (and little else).

by VK3YE
Thu Jan 03, 2019 9:17 am
Forum: General Discussion
Topic: What's on your Workbench?
Replies: 610
Views: 83611

Re: What's on your Workbench?

Quick & dirty vertical antenna for 6m

by VK3YE
Wed Jan 02, 2019 6:56 am
Forum: Contests, Field Days, Portable Operation, JOTA, SOTA
Topic: [EVENT| Melbourne QRP by the Bay - Sat 2 Feb 2019
Replies: 0
Views: 5959

[EVENT| Melbourne QRP by the Bay - Sat 2 Feb 2019

Just a reminder that Melbourne QRP by the Bay is coming up next month – Saturday 2 February at 3pm. Melbourne QRP by the Bay is an occasional gathering of homebrewers, QRPers and portable operators. Normally between about 15 and 30 people show up for a very convivial couple of hours. Bring yourself,...
by VK3YE
Sat Dec 29, 2018 10:54 am
Forum: General Discussion
Topic: What's on your Workbench?
Replies: 610
Views: 83611

Re: What's on your Workbench?

The most recent project. Tested on WSPR, with beacons and SSB DX.

by VK3YE
Thu Dec 13, 2018 4:32 pm
Forum: General Discussion
Topic: What's on your Workbench?
Replies: 610
Views: 83611

Re: What's on your Workbench?

Not the workbench but the ground.

Test was to show that a cheap handheld, some wood, some wire and an LED can work as a lecher line on 70cm and measure frequency to a 2% accuracy.

by VK3YE
Tue Nov 20, 2018 5:56 am
Forum: Ancillary, Test Equipment, Components & Parts
Topic: A box of hamfest freebies
Replies: 2
Views: 3754

A box of hamfest freebies

Why it's sometimes worth staying until the end

by VK3YE
Tue Nov 20, 2018 5:41 am
Forum: WSPR
Topic: WSPR mobile from inside a bus
Replies: 5
Views: 3545

WSPR mobile from inside a bus

Does it work?

by VK3YE
Tue Nov 06, 2018 8:00 am
Forum: General Discussion
Topic: What's on your Workbench?
Replies: 610
Views: 83611

Re: What's on your Workbench?

Horrendously inefficient but it works
test indoors.JPG
by VK3YE
Sun Sep 23, 2018 3:18 pm
Forum: General Discussion
Topic: What's on your Workbench?
Replies: 610
Views: 83611

Re: What's on your Workbench?

Changing a quartz crystal's frequency with sandpaper



And attacking a ceramic resonator

by VK3YE
Sun Sep 23, 2018 3:13 pm
Forum: WSPR
Topic: Some reviews of WSPR gear from Sweden
Replies: 0
Views: 5812

Some reviews of WSPR gear from Sweden

A transmitter and receiver from Zachtek



by VK3YE
Sun Sep 23, 2018 3:07 pm
Forum: Contests, Field Days, Portable Operation, JOTA, SOTA
Topic: Contact with an antenna on the ground
Replies: 0
Views: 5637

Contact with an antenna on the ground

A contact with a wire antenna on the ground. It will work but the report won't be good. And only stations with a low noise floor will hear you.

https://www.youtube.com/watch?v=LmJk3hFE8G0

It follows a previous experiment done with WSPR.

https://www.youtube.com/watch?v=Zk1Yg5-xELw
by VK3YE
Sun Sep 09, 2018 12:27 pm
Forum: General Discussion
Topic: What's on your Workbench?
Replies: 610
Views: 83611

Re: What's on your Workbench?

Variable inductor from corflute material - in this case used for a QRP antenna coupler

https://www.youtube.com/watch?v=NyKu0qKVA1I

by VK3YE
Thu Aug 25, 2016 8:05 pm
Forum: General Discussion
Topic: Lurking 101
Replies: 8
Views: 4850

Re: Lurking 101

The Wikipedia quote is likely a relic of 1980s - early 1990s era hobby computer culture (eg bulletin boards, shareware, furtive late night data transfers on phone lines etc). That culture was steeped in technological elitism and flame wars over scarce storage space and bandwidth. Those conditions ho...
by VK3YE
Thu Aug 25, 2016 7:09 pm
Forum: General Discussion
Topic: What's on your Workbench?
Replies: 610
Views: 83611

Re: What's on your Workbench?

Strange sound effects possible with SDRs, wireless microphones and drone machines (the non-flying variety).

https://www.youtube.com/watch?v=N47uxPTGoIc

by VK3YE
Wed Jul 20, 2016 6:04 am
Forum: General Discussion
Topic: What's on your Workbench?
Replies: 610
Views: 83611

Re: What's on your Workbench?

Using a cheap superregenerative UHF data receiver module and audio amplifier to receive 70cm AM signals on about 434 MHz. https://www.youtube.com/watch?v=7SoXrV6nKBQ 7SoXrV6nKBQ Possible improvements include adding a cavity filter to narrow selectivity (and avoid the heavy activity on 433.92 MHz) an...
by VK3YE
Wed Jun 29, 2016 8:10 pm
Forum: Transceivers, Transmitters & Receivers
Topic: ACITRON SSB-400
Replies: 20
Views: 7685

Re: ACITRON SSB-400

Links to articles on Acitron transceivers in AR magazine (available online)

Sept 1968 http://armag.vk6uu.id.au/1968-september-AR.html
July 1971 http://armag.vk6uu.id.au/1971-july-AR.html
Nov 1971 http://armag.vk6uu.id.au/1971-november-AR.html
by VK3YE
Fri Jun 24, 2016 8:14 pm
Forum: General Discussion
Topic: What's on your Workbench?
Replies: 610
Views: 83611

Re: What's on your Workbench?

The effect of adding a 1 transistor Q-multiplier to a crystal set.

https://www.youtube.com/watch?v=4ix5gNrJy2E