Some crude transmitter experiments
Search found 494 matches
- Sat Feb 02, 2019 9:29 pm
- Forum: 144 & 432 MHz
- Topic: 144 MHz with crystal oscillator modules
- Replies: 0
- Views: 8266
- Sat Feb 02, 2019 9:17 pm
- Forum: General Discussion
- Topic: What's on your Workbench?
- Replies: 663
- Views: 133576
Re: What's on your Workbench?
Transmit a TV picture with a 1N4148 diode (and little else).
- Thu Jan 03, 2019 9:17 am
- Forum: General Discussion
- Topic: What's on your Workbench?
- Replies: 663
- Views: 133576
Re: What's on your Workbench?
Quick & dirty vertical antenna for 6m
- 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: 7790
[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,...
- Sat Dec 29, 2018 10:54 am
- Forum: General Discussion
- Topic: What's on your Workbench?
- Replies: 663
- Views: 133576
Re: What's on your Workbench?
The most recent project. Tested on WSPR, with beacons and SSB DX.
- Thu Dec 13, 2018 4:32 pm
- Forum: General Discussion
- Topic: What's on your Workbench?
- Replies: 663
- Views: 133576
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.
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.
- Tue Nov 20, 2018 5:56 am
- Forum: Ancillary, Test Equipment, Components & Parts
- Topic: A box of hamfest freebies
- Replies: 2
- Views: 5188
A box of hamfest freebies
Why it's sometimes worth staying until the end
- Tue Nov 20, 2018 5:41 am
- Forum: WSPR
- Topic: WSPR mobile from inside a bus
- Replies: 5
- Views: 5227
WSPR mobile from inside a bus
Does it work?
- Tue Nov 06, 2018 8:00 am
- Forum: General Discussion
- Topic: What's on your Workbench?
- Replies: 663
- Views: 133576
Re: What's on your Workbench?
Horrendously inefficient but it works
- Sun Oct 21, 2018 12:02 pm
- Forum: Contests, Field Days, Portable Operation, JOTA, SOTA
- Topic: QRP Hours Contest - starts in 2 hrs
- Replies: 0
- Views: 7416
- Sun Sep 23, 2018 3:20 pm
- Forum: Ancillary, Test Equipment, Components & Parts
- Topic: Don't trust all SMA - SO239 adapters
- Replies: 8
- Views: 6384
- Sun Sep 23, 2018 3:18 pm
- Forum: General Discussion
- Topic: What's on your Workbench?
- Replies: 663
- Views: 133576
Re: What's on your Workbench?
Changing a quartz crystal's frequency with sandpaper
And attacking a ceramic resonator
And attacking a ceramic resonator
- Sun Sep 23, 2018 3:13 pm
- Forum: WSPR
- Topic: Some reviews of WSPR gear from Sweden
- Replies: 0
- Views: 7037
Some reviews of WSPR gear from Sweden
A transmitter and receiver from Zachtek
- 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: 7074
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
https://www.youtube.com/watch?v=LmJk3hFE8G0
It follows a previous experiment done with WSPR.
https://www.youtube.com/watch?v=Zk1Yg5-xELw
- Sun Sep 09, 2018 12:27 pm
- Forum: General Discussion
- Topic: What's on your Workbench?
- Replies: 663
- Views: 133576
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
https://www.youtube.com/watch?v=NyKu0qKVA1I
- Thu Aug 25, 2016 8:05 pm
- Forum: General Discussion
- Topic: Lurking 101
- Replies: 8
- Views: 6644
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...
- Thu Aug 25, 2016 7:09 pm
- Forum: General Discussion
- Topic: What's on your Workbench?
- Replies: 663
- Views: 133576
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
https://www.youtube.com/watch?v=N47uxPTGoIc
- Wed Jul 20, 2016 6:04 am
- Forum: General Discussion
- Topic: What's on your Workbench?
- Replies: 663
- Views: 133576
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...
- Wed Jun 29, 2016 8:10 pm
- Forum: Transceivers, Transmitters & Receivers
- Topic: ACITRON SSB-400
- Replies: 20
- Views: 11785
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
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
- Fri Jun 24, 2016 8:14 pm
- Forum: General Discussion
- Topic: What's on your Workbench?
- Replies: 663
- Views: 133576
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
https://www.youtube.com/watch?v=4ix5gNrJy2E