Search found 494 matches

by VK3YE
Sat Jan 01, 2011 8:50 pm
Forum: 50 MHz
Topic: Smallest 6m station?
Replies: 23
Views: 3531

Re: Smallest 6m station?

Hard to beat that Peter Hard but not impossible. Eg a single transistor superregenerative thing, with the one transistor on both Tx & Rx. Probably with a crystal earpiece on rx and a 3rd overtone crystal & carbon mic switched in for tx! VK2ZAY shows the way, but it would need to be shifted onto 6m ...
by VK3YE
Sat Jan 01, 2011 8:40 pm
Forum: LF, MF, HF
Topic: Single fed OCF and fan dipole
Replies: 6
Views: 1568

Re: Single fed OCF and fan dipole

Glenn, I admit to being a tad confused re the 4:1 balun - ought 1:1 be better given the 50 - 70 ohm impedance of both coax & dipoles? I had the exact same problem as you due to high density living - efficient operation on as many bands as possible without it being an eyesore. Multiple dipoles off th...
by VK3YE
Sat Jan 01, 2011 8:03 pm
Forum: 50 MHz
Topic: Smallest 6m station?
Replies: 23
Views: 3531

Re: Smallest 6m station?

I reckon G3XBM's 40 milliwatt 'SixBox' AM txcvr would take some beating.

http://www.youtube.com/user/G3XBM#p/u/17/c4pyzm_LEzk
by VK3YE
Thu Dec 30, 2010 10:13 am
Forum: Contests, Field Days, Portable Operation, JOTA, SOTA
Topic: 2m SSB /MM from Bass Strait - 22 Dec 2010
Replies: 9
Views: 913

Re: 2m SSB /MM from Bass Strait - 22 Dec 2010

VK2HRX wrote:I'd be interetsted in knowing why it didn't seem to work to well for you.
Let's just say that discretion nothwithstanding, not all regard radio communication as a legitimate activity to be undertaken by passengers.
by VK3YE
Wed Dec 29, 2010 11:48 pm
Forum: Contests, Field Days, Portable Operation, JOTA, SOTA
Topic: 2m SSB /MM from Bass Strait - 22 Dec 2010
Replies: 9
Views: 913

Re: 2m SSB /MM from Bass Strait - 22 Dec 2010

Thanks Jim. I was on the wrong side of the boat for you - I'm sure it would have been stronger on the other side. Looking at the map I think the signal would have got stronger, then weaker. BTW, the end of this recording includes a transmission from you. http://www.youtube.com/watch?v=ivMAWLljy64
by VK3YE
Wed Dec 29, 2010 8:35 pm
Forum: Contests, Field Days, Portable Operation, JOTA, SOTA
Topic: 2m SSB /MM from Bass Strait - 22 Dec 2010
Replies: 9
Views: 913

Re: 2m SSB /MM from Bass Strait - 22 Dec 2010

Many thanks to those who listened and to Lou and Jim for the contacts.

Unfortunately circumstances intervened and I could only keep the first sked.

The lesson is if you wish to operate from the Strait, buy or charter your own boat!

73, Peter
by VK3YE
Tue Dec 21, 2010 11:26 pm
Forum: Contests, Field Days, Portable Operation, JOTA, SOTA
Topic: 2m SSB /MM from Bass Strait - 22 Dec 2010
Replies: 9
Views: 913

2m SSB /MM from Bass Strait - 22 Dec 2010

Just to let everyone know that I intend to try 2m SSB maritime mobile from the Spirit of Tasmania on the 22 December daylight sailing. The ferry leaves Melbourne at 0900 local and arrives Devonport at 1800 local. Power/antenna: Up to 5w. 2 el yagi. Frequency: 144.150 MHz USB Calling and listening ti...
by VK3YE
Sat Dec 18, 2010 11:51 am
Forum: General Discussion
Topic: Fun schematic
Replies: 16
Views: 2242

Re: Fun schematic

Here's the frame of a nice timber cabinet to put it in when finished building (about 1/5 way down)

http://www.ic64.net/S/illusion.htm
by VK3YE
Wed Dec 15, 2010 6:25 pm
Forum: General Discussion
Topic: First test of magnetic loop
Replies: 19
Views: 2014

Re: First test of magnetic loop

http://www.ciromazzoni.com/English/Loop%20Antenna/Loop%20Maxi.htm John - thanks for the link. Don't know how they achieve the 6dB f/b ratio since the loop by itself is bidirectional. Here's another similar massive loop, but with a narrower (800Hz) bandwidth - apparently still works OK on SSB. http:...
by VK3YE
Tue Dec 14, 2010 11:41 pm
Forum: General Discussion
Topic: First test of magnetic loop
Replies: 19
Views: 2014

Re: First test of magnetic loop

I wonder is anyone else on the Logger using Mag Loops for any bands? Mag loops - great things! Your 3m of tubing will do well for all bands between 7 and 21 MHz. A good choice for the versatility of the bands you get and the upcoming solar cycle. 3.5 MHz will be a struggle but you'll still get soli...
by VK3YE
Sun Dec 05, 2010 7:44 am
Forum: LF, MF, HF
Topic: The ulimate multiband dipole
Replies: 12
Views: 2426

Re: The ulimate multiband dipole

An interesting article, although a little short for my satisfaction (I'm from the "more is more" camp !). I would agree, particularly if you want to use it on 80 metres. Can't remember where I read it, but a tuned feeder dipole's efficiency drops off dramatically once end to end length drops below ...
by VK3YE
Sun Dec 05, 2010 7:27 am
Forum: LF, MF, HF
Topic: 40m Interference
Replies: 1
Views: 868

Re: 40m Interference

Quite possibly Chinese or Taiwanese over the horizon radar.
by VK3YE
Sun Dec 05, 2010 7:20 am
Forum: LF, MF, HF
Topic: 9 Meter Vertical Antenna with Auto Tuner HF Radio
Replies: 5
Views: 1687

Re: 9 Meter Vertical Antenna with Auto Tuner HF Radio

Im planning on using a 9 Metre squid pole tied to a fence picket will have aprox 10 Metres of wire tied on pole with 8 x 30mts wire for ground radials will be installed on a open feild. Im guessing I need some series inducatance for use at 80/160mts and for higer freqs I would need some series capa...
by VK3YE
Sat Nov 27, 2010 8:07 am
Forum: Ancillary, Test Equipment, Components & Parts
Topic: What to build?
Replies: 14
Views: 1638

Re: What to build?

Sean - here's some more ideas, in rough order of complexity (forgive me if they start too basic): 1. Battery pack for portable use. My latest is using two Jaycar 3.3AH 7.2v packs intended for RC cars in series. Expensive but so far so good. 2. 1/4 wave 2m antenna for handheld. 3a. Field strength met...