Search found 494 matches

by VK3YE
Fri Jan 15, 2016 12:00 pm
Forum: General Discussion
Topic: What's on your Workbench?
Replies: 648
Views: 106863

Re: What's on your Workbench?

It's now a transceiver. Incomplete but it makes contacts. Added stages include: * second buffer for VXO * transmit mixer and post mixer BPF * transmit carrier oscillator and buffer (which is keyed) * transmit power amplifier chain and LPF https://www.youtube.com/watch?v=WN_2YBu0r7A WN_2YBu0r7A
by VK3YE
Fri Jan 15, 2016 11:50 am
Forum: Transceivers, Transmitters & Receivers
Topic: Suggest a transceiver for Foundation Call
Replies: 12
Views: 5644

Re: Suggest a transceiver for Foundation Call

A bit older would be a good used FT-840 (Yaesu's version of the IC718 - or is the Icom a version of the Yaesu?). Rigs like the FT840 and IC718 don't have menus so should be quite easy to use. The FT747 is older than the FT840 but is cheap/plasticky looking. A CW IF filter would be desirable but if y...
by VK3YE
Mon Jan 11, 2016 8:34 pm
Forum: General Discussion
Topic: H44 business idea
Replies: 7
Views: 1724

Re: H44 business idea

Interesting idea. Thought about listing it on Airbnb to mitigate some of the risk? Both owner and visitor have ratings (like on ebay) so there's a degree of accountability on both sides. Was chatting to some friends who had such a rental on Bruny Island (Tas). It has so far worked out well for them ...
by VK3YE
Tue Dec 15, 2015 6:33 pm
Forum: General Discussion
Topic: Terrain maps
Replies: 10
Views: 1448

Re: Terrain maps

by VK3YE
Thu Dec 10, 2015 9:51 pm
Forum: General Discussion
Topic: Remember these?
Replies: 64
Views: 23035

Re: Remember these?

And, for the old old timer, Part 3, covering 1930s - 1960s.

by VK3YE
Tue Dec 01, 2015 5:43 am
Forum: General Discussion
Topic: What's on your Workbench?
Replies: 648
Views: 106863

Re: What's on your Workbench?

Taming parasitic oscillations in variable crystal oscillators. Demonstrating a cure with a 7 MHz superhet receiver.

https://www.youtube.com/watch?v=UJ0-Ar7aodc

by VK3YE
Mon Nov 30, 2015 6:50 pm
Forum: Contests, Field Days, Portable Operation, JOTA, SOTA
Topic: Melbourne QRP by the Bay - Sat 14 November 2015
Replies: 5
Views: 4483

Re: Melbourne QRP by the Bay - Sat 14 November 2015

The 14th was a great success with about 20 present. Some weird and wonderful rigs and antennas were brought along and contacts were made on various bands. We passed the mic around to give out numbers for the VHF Field Day. Dinner was had at a nearby Peruvian restaurant - highly recommended. A great ...
by VK3YE
Mon Nov 23, 2015 5:27 am
Forum: General Discussion
Topic: What's on your Workbench?
Replies: 648
Views: 106863

Re: What's on your Workbench?

Ugly but it works. A detailed description of my latest homebrew 7 MHz receiver. Very simple, almost all discrete parts and good performance. I also describe a mixing scheme using common crystals that could be suitable for a dual band (7/14 MHz) receiver or transceiver.

by VK3YE
Fri Nov 06, 2015 5:28 am
Forum: General Discussion
Topic: Remember these?
Replies: 64
Views: 23035

Re: Remember these?

Emtronics, Rod Irving, Magraths, All Electronics, Homecrafts, McGills and more. The list goes on. What do their buildings look like today? Watch this comprehensive just released 2-part series on electronics/radio stores in Melbourne 1960s - 1990s. Part 1 https://www.youtube.com/watch?v=kwb6LJlYZf8 k...
by VK3YE
Mon Nov 02, 2015 5:00 am
Forum: Contests, Field Days, Portable Operation, JOTA, SOTA
Topic: Heads Up!: 2015 Spring VHF-UHF Field Day
Replies: 54
Views: 16919

Re: Heads Up!: 2015 Spring VHF-UHF Field Day

Saturday afternoon is the Melbourne QRP by the Bay gathering (details https://www.facebook.com/events/698958660206329/ ).

But weather permitting we might take along a small 2m SSB station. So you may well hear multiple callsigns on air.
by VK3YE
Tue Oct 20, 2015 5:24 am
Forum: Contests, Field Days, Portable Operation, JOTA, SOTA
Topic: Melbourne QRP by the Bay - Sat 14 November 2015
Replies: 5
Views: 4483

Re: Melbourne QRP by the Bay - Sat 14 November 2015

Since next month's Melbourne QRP event coincides with the Spring VHF/UHF Field Day, I might bring along a small 2m SSB station to give it a VHF flavour. Although the location is 0 metres above sea level, some excellent 2m contacts have been made from it, including VK5s last year. EYV2b3WAqvs In addi...
by VK3YE
Sat Oct 10, 2015 3:05 pm
Forum: Contests, Field Days, Portable Operation, JOTA, SOTA
Topic: Melbourne QRP by the Bay - Sat 14 November 2015
Replies: 5
Views: 4483

Melbourne QRP by the Bay - Sat 14 November 2015

(an event for those who love homebrew portable radio equipment, outdoors transmitting and QRP operating) Following previous events, which keep getting better and better, we're doing it again. A fifth 'QRP by the Bay' gathering will be held on Saturday November 14, 2015 at Chelsea beach, 30km south o...
by VK3YE
Sun Sep 13, 2015 10:07 pm
Forum: Transceivers, Transmitters & Receivers
Topic: 6 band HF SSB transceiver kit
Replies: 12
Views: 6368

Re: 6 band HF SSB transceiver kit

The Juma could also be worth investigating http://www.nikkemedia.fi/juma-trx2/
by VK3YE
Sun Sep 13, 2015 7:27 am
Forum: Transceivers, Transmitters & Receivers
Topic: 6 band HF SSB transceiver kit
Replies: 12
Views: 6368

Re: 6 band HF SSB transceiver kit

Another option is the M1

Ambitious, Australian and possibly better performance

http://www.minikits.com.au/m1-transceiver.htm
by VK3YE
Mon Aug 24, 2015 7:05 pm
Forum: Contests, Field Days, Portable Operation, JOTA, SOTA
Topic: JOTA 2015 - activities suggestions ?
Replies: 12
Views: 1731

Re: JOTA 2015 - activities suggestions ?

Some ideas: Set up a couple of handhelds and a couple of yagis to demonstrate satellite working (though the passes are too quick for many contacts) HF pedestrian mobile with a magnetic loop A morse or audio oscillator but set up so that its pitch varies depending on skin resistance (so can generate ...
by VK3YE
Sun Aug 23, 2015 7:32 am
Forum: General Discussion
Topic: What's on your Workbench?
Replies: 648
Views: 106863

Re: What's on your Workbench?

7 MHz phasing method direct conversion SSB transceiver Transmitter final and PA added with approx 400 - 500mW output. Contacts up to 600 - 800km distance. Video by Paul VK5PAS from yesterday (when it was only 200mW): https://www.youtube.com/watch?v=qPW7mUV8Kds Test with local station LSB s9 / unwan...
by VK3YE
Wed Aug 05, 2015 7:15 am
Forum: General Discussion
Topic: What's on your Workbench?
Replies: 648
Views: 106863

Re: What's on your Workbench?

Despite having only 3 transistors and 1 IC, what you see below transmits and receives a frequency agile signal on 7 MHz SSB. phasing ssb.JPG * 2N2222A VXO using 7.16 MHz ceramic resonator - covers 7.040 - 7.140 MHz * MPF102 buffer * BC548 RF preamp (rx only) * LM386 AF amp on rx/mic amp on tx * 1N41...
by VK3YE
Tue Jul 28, 2015 9:00 pm
Forum: General Discussion
Topic: How sociable are 6 and 2m?
Replies: 17
Views: 1665

Re: How sociable are 6 and 2m?

Perhaps 6m might be the best of a poor choice. I'd go with 2m initially, but with a view to getting something going on 6m by early December. 6m activity is sporadic and you may go weeks or more between hearing a signal outside of a few VHF Field Day contacts. Whereas 2m at least has the Wednesday e...
by VK3YE
Mon Jul 27, 2015 6:26 pm
Forum: Silent Keys
Topic: ZL2AMJ: NZART & IARU stalwart becomes a silent key
Replies: 2
Views: 4922

Re: ZL2AMJ: NZART & IARU stalwart becomes a silent key

Saddened to hear of Fred's passing. I was also privileged to meet Fred at a past WIA convention. Warm, friendly and approachable are my memories. Fred's NZART and IARU service has been described elsewhere. A biography appears at: http://www.qsl.net/zl2amj/aboutme/me.html Also important was Fred's co...
by VK3YE
Wed Jul 22, 2015 11:40 pm
Forum: 1296, Microwaves and Opto
Topic: Is this a simple way to get on 10 GHz?
Replies: 30
Views: 2911

Re: Is this a simple way to get on 10 GHz?

A 10 GHz Gunnplexer link by W2IOG. Article below.

http://armag.vk6uu.id.au/1978-october-AR.html

A little earlier W5KHT described a video Gunnplexer system.

http://armag.vk6uu.id.au/1978-august-AR.html