Search found 696 matches

by VK5ZD
Thu Aug 22, 2019 9:38 pm
Forum: 1296, Microwaves and Opto
Topic: 23 on 23: Tuesday July 23rd 2019
Replies: 13
Views: 4470

Re: 23 on 23: Tuesday July 23rd 2019

Hi Adam.
You misunderstand. What I mean is that I've not heard from anyone wanting to start it in VK5.
by VK5ZD
Thu Aug 22, 2019 10:17 am
Forum: 1296, Microwaves and Opto
Topic: 23 on 23: Tuesday July 23rd 2019
Replies: 13
Views: 4470

Re: 23 on 23: Tuesday July 23rd 2019

I have floated the idea of 23 on 23 with a mate in VK5 who thinks it is a marvellous idea. He will spread the idea among VK5 proponents of the 23cm band. Don't know who your mate is, but, aside from this post, I've not heard anything about this. Neither have the other six 23cm operators in our club...
by VK5ZD
Wed Aug 07, 2019 4:09 pm
Forum: 1296, Microwaves and Opto
Topic: Antennas for 3.4 GHz
Replies: 29
Views: 7112

Re: Antennas for 3.4 GHz

OK. Just for clarification, both the photos in my previous post were taken with the antenna on it's side. In normal use, the grid bars are horizontal and the biquad feed is vertical. There is nothing to be gained by adding mesh for use at 3.4GHz. The link posted by Lou will give the required dimensi...
by VK5ZD
Wed Aug 07, 2019 12:05 am
Forum: 1296, Microwaves and Opto
Topic: Antennas for 3.4 GHz
Replies: 29
Views: 7112

Re: Antennas for 3.4 GHz

VK3QI wrote:
Tue Aug 06, 2019 3:33 pm
In your picture of the bi-quad, shouldn't the parabolic reflector be turned 90 degrees to have the bars horizontal?

Or is the bi-quad orientation incorrect?
The bi-quad orientation is correct. It was just convenient to clamp the antenna on it's side in a bench vice to take the photo.
by VK5ZD
Tue Aug 06, 2019 11:08 am
Forum: 1296, Microwaves and Opto
Topic: Antennas for 3.4 GHz
Replies: 29
Views: 7112

Re: Antennas for 3.4 GHz

Replace the original 2.4GHz feed with one of these.
I've made 2 of them for 3.4GHz and they work well.

IMG_20180731_235823.jpg
IMG_20180731_235837.jpg
by VK5ZD
Sat Jul 06, 2019 12:57 am
Forum: 1296, Microwaves and Opto
Topic: GPSDO Phase noise
Replies: 13
Views: 4605

Re: GPSDO Phase noise

More testing... This time I used the five different 10MHz sources as the reference for a 'Kuhne MKU LO 8-13 PLL' oscillator which was configured to output 11,952MHz (x 2 + 144 = 24,048MHz). The five sources are as shown in my previous two posts, namely my home brew GPSDO, a BG7TBL GPSDO, a CIC OCXO,...
by VK5ZD
Fri Jul 05, 2019 11:00 am
Forum: Transceivers, Transmitters & Receivers
Topic: TYT TH-9800
Replies: 12
Views: 6198

Re: TYT TH-9800

VK2XAX wrote:
Thu Jul 04, 2019 2:42 pm
Ian,,, the link to your band limit file doesn't work any more - do you sill have that to share ?
Try here

Hopefully it's still compatible.
by VK5ZD
Fri Jul 05, 2019 1:34 am
Forum: 1296, Microwaves and Opto
Topic: GPSDO Phase noise
Replies: 13
Views: 4605

Re: GPSDO Phase noise

An finally, the Efratom Lpro-101 (the previous post wouldn't let me add any more images).
All I can say about this device is that I don't recommend it if you want a clean 10Mhz reference!


LPRO-101 10MHz RUBIDIUM.png
Phase Noise

LPRO-101 Plot.png
50kHz Span

LPRO-101 Plot 500KHz.png
500kHz span
by VK5ZD
Fri Jul 05, 2019 1:30 am
Forum: 1296, Microwaves and Opto
Topic: GPSDO Phase noise
Replies: 13
Views: 4605

Re: GPSDO Phase noise

Thought I'd add my 2c worth to this discussion. I have one of the BG7TBL GPSDO units the same as Dave's, but with a different OCXO inside (CTS 970-2178-46). I think they must use whatever surplus OCXO units they can get hold when they build these. By way of comparison, I also have an Isotemp 134-10 ...
by VK5ZD
Fri Jun 14, 2019 1:44 pm
Forum: Transceivers, Transmitters & Receivers
Topic: FT-817 DC Input Socket
Replies: 6
Views: 4108

Re: FT-817 DC Input Socket

I just use a small piece of sheet aluminium to hold my FT-817 connectors in place.
IMG_20190614_130819.jpg
by VK5ZD
Mon May 27, 2019 10:30 am
Forum: General Discussion
Topic: Hand keyed Morse clarity
Replies: 8
Views: 3754

Re: Hand keyed Morse clarity

What regs are you referring to?
There is no requirement to send or receive morse code for any of the amateur licenses.
by VK5ZD
Thu May 09, 2019 12:45 am
Forum: Miscellaneous
Topic: SSD Failure
Replies: 1
Views: 3512

SSD Failure

Just a heads up for anyone that has a SSD in their PC/Laptop, make sure you have a backup. The most common failure mode for 'conventional' hard drive (i.e. those with a spinning discs and read/write heads) is for the disc surface to degrade resulting in file corruption. While this can be annoying yo...
by VK5ZD
Thu May 09, 2019 12:21 am
Forum: 1296, Microwaves and Opto
Topic: 13 cm calling frequency.
Replies: 15
Views: 4255

Re: 13 cm calling frequency.

In VK5 we use 2400.15MHz or 2400.2MHz. The band plan is a suggestion, not an actual license condition, and I'm happy follow the band plan where practical. However, as has been noted, there is a lot of WiFi 'crud' around 2403MHz and above. Secondly, the only amateur satellite using 2.4GHz that I'm aw...
by VK5ZD
Wed Apr 03, 2019 7:52 am
Forum: 1296, Microwaves and Opto
Topic: New from Analog the ADF4371 62Mhz - 32Ghz Synthesizer
Replies: 8
Views: 3675

Re: New from Analog the ADF4371 62Mhz - 32Ghz Synthesizer

Apologies I got the model number slightly wrong. Search for CMA382400AUP which is the full model and there are a few on eBay for US$56 at the moment. If you buy one of these from 'total_parts' ebay seller then ignore his comment about it requiring 12v at 4A. That is guaranteed to kill it. :shock: T...
by VK5ZD
Thu Mar 28, 2019 12:00 am
Forum: 1296, Microwaves and Opto
Topic: MAD - Sunday March 24, 2019
Replies: 23
Views: 7304

Re: MAD - Sunday March 24, 2019

Further to my post of the 26th, that's not to say that we didn't try to extend some records, sometimes successfully, sometimes not (no VK4 records were harmed :D :D :D ). However, we did not do this at the expense of making other contacts. Surely one aspect of this hobby is to try pushing the limits...
by VK5ZD
Wed Mar 27, 2019 12:08 am
Forum: 1296, Microwaves and Opto
Topic: MAD - Sunday March 24, 2019
Replies: 23
Views: 7304

Re: MAD - Sunday March 24, 2019

The BVHFG's schedule, if there ever was one, completely revolved around the VK5 road trip. Perhaps the VK5s should have been in town a day earlier to fit in with the planned VK4 Activity Day? If there was a schedule we were not aware of it. We were in town the day before as we had originally assume...
by VK5ZD
Mon Mar 25, 2019 11:37 pm
Forum: 1296, Microwaves and Opto
Topic: MAD - Sunday March 24, 2019
Replies: 23
Views: 7304

Re: MAD - Sunday March 24, 2019

Then throw in the current episode with the VK5's (only here to break records nothing to do with MAD) and it was even more crazy. Don't know why you would think that. If all we wanted to do was have a go at breaking records then we could just as easily do that in SA and not bother to drive 6,000km. ...
by VK5ZD
Fri Mar 22, 2019 7:55 am
Forum: 1296, Microwaves and Opto
Topic: MAD - Sunday March 24, 2019
Replies: 23
Views: 7304

Re: MAD - Sunday March 24, 2019

Who's going where? Myself, Dave (VK5KK) and Tim (VK5ZT) would like to know so we can put ourselves somewhere with a good likelihood of making a contact or three. :lol: :lol: :lol:
by VK5ZD
Fri Mar 22, 2019 7:51 am
Forum: 1296, Microwaves and Opto
Topic: VK5 Microwave Road Trip
Replies: 12
Views: 4313

Re: VK5 Microwave Road Trip

Hayden (VK7HH): I can only apologise as things did not go to plan at our end. The night before we decided that I'd go to Mt Buningyong so we could try a long haul 76GHz contact fom Mt Donna Buang. Dave and Tim went to Mt Donna Buang in the morning as planned only to find that the trees had grown sin...
by VK5ZD
Sun Mar 03, 2019 5:46 pm
Forum: 1296, Microwaves and Opto
Topic: VK5 Microwave Road Trip
Replies: 12
Views: 4313

VK5 Microwave Road Trip

David (VK5KK), Tim (VK5ZT) and I will be doing a tour which will include visits to VK1, VK2, VK3 and VK4 during the week from the 15th to the 24th of March. The main purpose of the trip is to work as many people as possible on the microwave bands, in particular the mm wave frequencies (i.e. 24GHz an...