Search found 375 matches

by VK2AVR
Wed Aug 24, 2016 9:13 am
Forum: Ancillary, Test Equipment, Components & Parts
Topic: Counterfeit BLF188XR
Replies: 7
Views: 2144

Re: Counterfeit BLF188XR

Have had similar issues with the Chinamans audio power transistors. And the Chinamans lm7805's seem rather keen to let out the smoke.....but youse gets whats youse pays for I suppose. Accept a 50% derating factor and all will be well....... No. Don't do this. If you do, you simply perpetuate the co...
by VK2AVR
Thu Aug 18, 2016 9:26 am
Forum: Propagation & Solar Cycle News
Topic: Solar Cycle 25...how old will u be?
Replies: 39
Views: 8057

Re: Solar Cycle 25...how old will u be?

Who cares about the solar cycle, the DX is still there.

Adapt your techniques!
by VK2AVR
Tue Jul 26, 2016 8:58 am
Forum: General Discussion
Topic: What's on your Workbench?
Replies: 603
Views: 58418

Re: What's on your Workbench?

Designing a PCB for a linear PSU with precision crowbar at the moment, got some expensive (and labour intensive) equipment that needs 5V/12V dual rails. I don't want the equipment to go up in smoke in case of PSU fault :thumbup:
by VK2AVR
Tue Jul 26, 2016 8:52 am
Forum: Contests, Field Days, Portable Operation, JOTA, SOTA
Topic: Trans-Tasman Low-Bands Challenge 2016
Replies: 6
Views: 947

Re: Trans-Tasman Low-Bands Challenge 2016

MWRS operated portable near Central Mangrove, NSW. 160m dipole as far up into the trees as we could get it, low noise floor was fantastic except for a club member's cheapo reversing camera radiating all over 80m :lol: We used an antenna tuner to coerce the antenna into 80/40m operation. 61 contacts...
by VK2AVR
Sun Jul 24, 2016 9:07 pm
Forum: LF, MF, HF
Topic: 40 meter rotatable dipole questions
Replies: 42
Views: 5624

Re: 40 meter rotatable dipole questions

VK4WDM wrote:The other antenna worth a mention is a magnetic loop. I am making one to try out as a receiving antenna but the reports of its directivity vary.
My experience is they work pretty well as receiving loops but very hard to make it efficient enough to compare even to a low dipole.
by VK2AVR
Mon Jun 20, 2016 9:11 am
Forum: Software Defined Radio
Topic: SDRPlay RSP
Replies: 15
Views: 1837

Re: SDRPlay RSP

Wayne, The RTLSDR dongles are designed as DVB-T receivers. If you use the included driver and software, that's exactly what you'll get. The SDR functionality was discovered by some reverse engineering and subsequently a different driver was developed to use the SDR functionality. There are plenty of...
by VK2AVR
Tue Jun 14, 2016 9:49 am
Forum: Digital Modes Miscellaneous
Topic: Windows 10 and digimode programs
Replies: 22
Views: 3038

Re: Windows 10 and digimode programs

Windows 10 is more than a bit sketchy.. MS is pushing very hard to offer a "free" OS (free for how long? plus, it's already showing targeted advertising). People are being force-upgraded to Windows 10 because they clicked the 'X' on the upgrade prompt. Microsoft decided after decades of consistency ...
by VK2AVR
Tue Jun 14, 2016 9:10 am
Forum: Software Defined Radio
Topic: SDRPlay RSP
Replies: 15
Views: 1837

Re: SDRPlay RSP

VK3LU wrote:The laptop I use for ham use is running XP, so I would probably have to upgrade. :roll: :roll:
Dunno if you'd call Win10 an upgrade..

Linux Mint for me these days (although it carries a fairly decent learning curve)

SDRPlay looks like a great receiver
by VK2AVR
Sun Apr 17, 2016 8:11 pm
Forum: Towers, Masts & Transmission Lines
Topic: In-line joining of coax
Replies: 22
Views: 1840

Re: In-line joining of coax

Crimp or solder a connector onto each cable and use a joiner.

It won't talk to Voyager but you'll still be on air.
by VK2AVR
Fri Apr 01, 2016 10:49 am
Forum: Propagation & Solar Cycle News
Topic: Solar Cycle #24 is (Doh) Crashing
Replies: 11
Views: 1555

Re: Solar Cycle #24 is (Doh) Crashing

Thanks Danny, that was a great read. Recently at MWRS we were playing around with a wideband active loop antenna (1m diameter aluminium loop) and pulled in a WSPR signal from Belgium. The active loop was INDOORS about 2 metres above the ground and the Belgium station's report said they were using 1 ...
by VK2AVR
Mon Mar 14, 2016 8:33 am
Forum: EMC, Interference
Topic: Mind programming using microwaves
Replies: 21
Views: 1413

Re: Mind programming using microwaves

VK4WDM wrote:How would you respond when somebody knocked at the door and said that your signals were altering their mind state or that of their children?
gotta get new people into the hobby somehow! :lol:
by VK2AVR
Fri Mar 04, 2016 11:09 am
Forum: 50 MHz
Topic: Olivia on 6m
Replies: 10
Views: 1072

Re: Olivia on 6m

I'd be keen on trying Olivia, it has been on my TODO list for a while. I have a clear outlook north so working into VK4 on 6m should be possible from home.
by VK2AVR
Fri Mar 04, 2016 10:37 am
Forum: Contests, Field Days, Portable Operation, JOTA, SOTA
Topic: Get off Social Media_Radio-Active Weekend
Replies: 1
Views: 497

Re: Get off Social Media_Radio-Active Weekend

MWRS is planning 2 camping trips - one near Mittagong and one in Barrington Tops near Polblue. So we plan to rattle the sky from multiple locations :)

Also we are planning on taking our 3.4GHz panel to Barrington so if anyone wants to try a contact send me a PM and we'll make a sked.
by VK2AVR
Wed Mar 02, 2016 9:05 am
Forum: Arduino, Picaxe, Raspberry Pi, and variants
Topic: Raspberry Pi on sale at last
Replies: 28
Views: 3226

Re: Raspberry Pi on sale at last

Yeah, from what I've heard the Win10 version of the "OS" for the Pi doesn't let you run normal desktop applications, it only lets you compile applications for IoT and push it to the Pi. So unless you are doing IoT development it's kinda pointless. You are much better off to stick with Linux on the P...
by VK2AVR
Tue Mar 01, 2016 10:36 am
Forum: Arduino, Picaxe, Raspberry Pi, and variants
Topic: Raspberry Pi on sale at last
Replies: 28
Views: 3226

Re: Raspberry Pi on sale at last

Doesn't need to be a big project for you to start playing and get comfortable. They are basically a small Linux computer. And there are so many guides out there that you can just pick one and try it. Hobby sites like Adafruit and seeedstudio sell all kinds of modules and kits that just plug together...
by VK2AVR
Mon Feb 29, 2016 10:53 pm
Forum: General Discussion
Topic: Wyong Field Day 2016 - Impressions
Replies: 24
Views: 3123

Re: Wyong Field Day 2016 - Impressions

Plenty of amazing things happening *with* the use of the internet, WSPR, co-ordinating moonbounce contacts, DX clusters, APRS, etc. The internet is a great vessel for sharing ideas and spreading knowledge. But this hobby does have to get with the times and stay relevant. The image of ham radio needs...
by VK2AVR
Mon Feb 29, 2016 10:43 pm
Forum: Satellites & Balloons
Topic: ISS clearly Visible over Sydney Tonight
Replies: 1
Views: 347

Re: ISS clearly Visible over Sydney Tonight

Due to the speed it moves, tracking it in a telescope is difficult. There are people who have managed and either taken a guided shot or used the moon as a backdrop and captured a silhouette. But the ISS is very small in angular terms, and it is moving very fast. Taking a long exposure using a basic ...
by VK2AVR
Mon Feb 29, 2016 10:37 pm
Forum: WSPR
Topic: WSPR and Raspberry Pi
Replies: 7
Views: 720

Re: WSPR and Raspberry Pi

VK3BQ wrote:i never looked at a specan of the quality of the output
I'm sure it's a very high quality square wave :P
by VK2AVR
Mon Feb 29, 2016 1:25 pm
Forum: WSPR
Topic: WSPR and Raspberry Pi
Replies: 7
Views: 720

Re: WSPR and Raspberry Pi

What sort of problems?

This guide seems pretty straightforward and uses a Signalink as the interface to a real radio. transmits and receives:

http://wsprnet.org/drupal/node/5353

XP will be easier, granted..
by VK2AVR
Mon Feb 29, 2016 10:13 am
Forum: WSPR
Topic: WSPR and Raspberry Pi
Replies: 7
Views: 720

Re: WSPR and Raspberry Pi

Why would you ruin a Pi by installing Windows on it? :P Plenty of guides on the net for turning them into WSPR transmitters by toggling one of the GPIO pins at high speed (needs a low pass filter!). Haven't really seen anyone do it on receive as well but if you added a proper radio interface to it t...