Search found 156 matches

by VK4TIM
Mon Jan 18, 2016 9:57 am
Forum: EMC, Interference
Topic: Green Interference!!!
Replies: 26
Views: 2833

Re: Green Interference!!!

What's the best store to get the Philips LED downlights? are these the ones that can be found at Wooloworths and Coles or lighting places, electrical wholesalers or Bunnings? Also, on this, what are the best 240-12V "Transformers"to use with the LED lights, ones that don't radiate crap. Have got som...
by VK4TIM
Fri Nov 27, 2015 11:43 am
Forum: Transceivers, Transmitters & Receivers
Topic: Kenwood TM-V7 fading screen fix
Replies: 1
Views: 971

Re: Kenwood TM-V7 fading screen fix

The other fault which these units are well known for is that of failed lines/segments on the LCD display itself, the fault is a known manufacturing defect that Kenwood are also well aware of, but refuse to repair unless the unit is still under warranty. My Kenwood TM-V7A has the well known display f...
by VK4TIM
Tue Nov 03, 2015 1:23 pm
Forum: LF, MF, HF
Topic: 10m mobile antenna ideas?
Replies: 29
Views: 2735

Re: 10m mobile antenna ideas?

I was wondering if there's possibly an issue with coax length, as other have suggested. From memory, and a few 26/27MHz installations I have donein years gone by, when the coax length was a multiple of half electrical wavelength (300/f x vf) everything was happy. I recall problems when we had a cabl...
by VK4TIM
Wed Sep 02, 2015 5:02 pm
Forum: Satellites & Balloons
Topic: I made my first sat contact this afternoon. Super stoked
Replies: 14
Views: 1020

Re: I made my first sat contact this afternoon. Super stoke

Congrats on your first satellite QSO, now you have succeeded, you can work our what suits your needs and what works best. You can only continue to make more QSOs and get better results. I recall my first QSOs on AO-21, 435 MHz up and 145.987 down, using a fixed yagi pointing up into the sky for the ...
by VK4TIM
Mon Jul 20, 2015 11:47 am
Forum: FM, Repeaters, D-STAR
Topic: Australian DMR repeater network
Replies: 42
Views: 5589

Re: Australian DMR repeater network

Those repeaters you mentioned are as far as I know, all part of the DMR-MARC network. I have a radio that I have programmed for the Brisbane DMR-MARC repeater (you need to get an ID number and be authorised to access DMR-MARC) but I can only hear local traffic on the local repeater, and nothing from...
by VK4TIM
Tue Jul 14, 2015 3:07 pm
Forum: Regulatory, Licencing & Exams
Topic: What new bands should we ask for?
Replies: 58
Views: 4033

Re: What new bands should we ask for?

I would say that we should at least try for: 160m: 1800-1950 kHz, preferably 1800 to 2000 kHz. 80m: 3500 to 3900 kHz. 60m: 5250 to 5450 kHz. 6m: 50.000 to 54.000 MHz exclusive primary. 32cm 921 to 929 MHz - up to 100W EIRP. Retain 2300 to 2302 MHz. Retain 3300 to 3410 MHz. Seek primary on bands abov...
by VK4TIM
Thu Jun 25, 2015 10:09 am
Forum: Propagation & Solar Cycle News
Topic: Aurora in the southern states
Replies: 6
Views: 1271

Re: Aurora in the southern states

I'd like to see the ZL4s (Invercargill) commission a high powered 6m and 2m analog/digital mode beacon, with high gain antennas pointing towards the south pole, for Auroral observations. I've heard the former channel 1 TV 45.250 from Mt Hedgehope via combination of tropo and Aurora, once here in VK4...
by VK4TIM
Tue Jun 09, 2015 1:19 pm
Forum: 1296, Microwaves and Opto
Topic: 3.4 GHz Transverter Conversion (3.5 GHz WiFi transceiver)
Replies: 171
Views: 15819

Re: 3.4GHz transverter conversion

So for those of us who live outside VK3, are you able to pop them in a box and Australia post them for the appropriate amount?
To VK4 shouldn't cost more than about $20?

I'd be interested in a couple.
by VK4TIM
Fri Jun 05, 2015 8:44 am
Forum: 1296, Microwaves and Opto
Topic: 10 GHz dish & misc parts needed
Replies: 14
Views: 1111

Re: 10 GHz dish & misc parts needed

I'm after a feed for one of these dishes too! I've had mine in the back of the shed for a while, and I too am looking for something that has the transition to SMA at the back ofthe dish. If anyone has a good feed design that is made out of readily available waveguide, I'm sure there would be plenty ...
by VK4TIM
Wed Mar 11, 2015 9:13 am
Forum: Transceivers, Transmitters & Receivers
Topic: audio bandwidth
Replies: 1
Views: 305

Re: audio bandwidth

Good morning, I'm assuming you're trying to run data at higher bit rates on a UHF radio here. You could use discriminator audio, many commercial radios either have a discriminator output point or are easily modified to bring it out onto an accessory connector. As for audio bandwidth, that would depe...
by VK4TIM
Mon Feb 16, 2015 9:01 am
Forum: FM, Repeaters, D-STAR
Topic: DSTAR Vs C4FM Vote
Replies: 71
Views: 6740

Re: DSTAR Vs C4FM Vote

DSTAR or Yaesu C4FM? Never used either of them, but I am active with both P25 and DMR. I have comissioned a number of TETRA networks, also a couple of DMR systems, and P25 as well, all commercially. For P25 Amateur I use a Simoco SRM9000 fully enabled, EFJohnson 40W mobile in the work wagon, and hop...
by VK4TIM
Wed Jan 28, 2015 9:40 am
Forum: FM, Repeaters, D-STAR
Topic: Repeater Controllers
Replies: 14
Views: 3317

Re: Repeater Controllers

Try the Arcom controller range, I've used an RC-210 which will do everything you have asked for, plus a few other things such as audio delay etc to eliminate mute "crashes" when the uplink carrier goes off. It can do DTMF, CTCSS decode/encode and more, there's a voice synth option for voice IDs. RC-...
by VK4TIM
Tue Jan 27, 2015 2:05 pm
Forum: General Discussion
Topic: Lightning protection
Replies: 28
Views: 1195

Re: Lightning protection

I always ensure that any antenna towers/poles verticals etc are grounded with a good earth stake, for a minimum impedance path to ground as possible. Probably 15 yrs ago we had a nearby strike hit a house across the road down a long driveway, much lower in elevation that my place at the time, absolu...
by VK4TIM
Fri Jan 23, 2015 1:59 pm
Forum: 1296, Microwaves and Opto
Topic: 23 on 23 Jan 2015
Replies: 6
Views: 452

Re: 23 on 23 Jan 2015

I still need to fix the transverter I have to make it work with my FT-817, but I think, given the weather in SE QLD today, we'd be blowing bubbles...

I won't be able to be on air tonight.
by VK4TIM
Fri Jan 23, 2015 1:43 pm
Forum: EMC, Interference
Topic: RFI from Solar inverters! "Not happy Jan ! "
Replies: 29
Views: 4337

Re: RFI from Solar inverters! "Not happy Jan ! "

I'd be curious to know if noise from micro-inverters using Power Line Communications forming a network between each inverter and to a plug-in ethernet to power line communications device, enabling connection to your domestic LAN. I have asked a couple of providers for detailed information on these t...
by VK4TIM
Wed Jan 21, 2015 4:28 pm
Forum: FM, Repeaters, D-STAR
Topic: Repeaters, Duplexer, BP/BR cavity construction
Replies: 16
Views: 3143

Re: Repeaters, Duplexer, BP/BR cavity construction

Hayden, Are you running a notch-notch configuration or a pass/notch-pass/notch configuration? I recall playing around with filters made from LDF5-50, using a single pickup loop we could make a very good notch, while with two loops fed appropriately we could get a good pass response. Using say two pa...
by VK4TIM
Tue Dec 16, 2014 2:27 pm
Forum: Digital Modes Miscellaneous
Topic: Telemetry on 471 MHz
Replies: 10
Views: 987

Re: Telemetry on 471 MHz

This could also be low powered devices like crane controllers, as well as telemetry. There is provision for licenced 10mW controllers and up to 5W for telemetry. I have seen plenty of gear, typically 1200bd using Bell 202 tones or similar running things like river/water level sensors, often using th...
by VK4TIM
Thu Nov 27, 2014 1:22 pm
Forum: LF, MF, HF
Topic: Radio Australia Shortwave - ABC cuts?
Replies: 24
Views: 1435

Re: Radio Australia Shortwave

John, You are correct about one thing, and that is mobile phone coverage in many Asian countries, and yes, from my personal experience, coverage in these places is far better than it is here, there is a greater population spread more evenly. However, when it comes to internet access and available ba...
by VK4TIM
Mon Nov 10, 2014 2:09 pm
Forum: EMC, Interference
Topic: Pager interferance again
Replies: 19
Views: 1364

Re: Pager interferance again

If you're interested, I have two cut off tails of LDF5-50 that I can give you to experiment with, these are probably approximately 1.2m in length, removed from a decommissioned comemrcial site. You never know when this stuff might come in handy, so I hung onto it. You might be able to make two bandp...
by VK4TIM
Fri Oct 17, 2014 8:37 am
Forum: Contests, Field Days, Portable Operation, JOTA, SOTA
Topic: JOTA/JOTI weekend 18-19th October 2014
Replies: 15
Views: 541

Re: JOTA/JOTI weekend 18-19th October 2014

Hi Mike,

Planning on assisting wih the Samford Valley group, their site is well set up and in an RF quiet environment in the hills west of Brisbane.