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Search Results
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Thread: Help wanted
Post: RE: Help wanted
| If you turn the element upside down and place it such that the aluminium disk is just immersed in a solvent such as petrol. After a while and the aluminium disk will become loose.
Remove the alu... |
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VK6ZFG |
General Discussion
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3 |
7,919 |
22-03-2024, 12:50 PM |
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Thread: the way the USA has corrupted English
Post: RE: the way the USA has corrupted English
| The problem with spelling in English is that it is not phonetic as it is in many other languages. In these languages saying written text is straight forward as what you see is what you say. Not so i... |
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VK6ZFG |
Off Topic!
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9 |
4,893 |
16-03-2024, 11:20 AM |
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Thread: FT8 and Q65 to JA during TEP on 2m
Post: RE: FT8 and Q65 to JA during TEP on 2m
| Well it looks like the Perth VK6RPH 144.460MHz Beacon frequency is being monitored in JA.
The Beacon operates on a 24hr basis on CW, JT65C and JT4F but only in the TX mode.
73
Igor |
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VK6ZFG |
144MHz & 432MHz
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27 |
7,840 |
22-01-2024, 03:12 PM |
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Thread: FM Deviation
Post: RE: FM Deviation
| Hi Steve
I had recollections that pre-emphasis had to be applied to one of them. As I am not paid to think anymore I looked it up.
PM has inherent 6 dB/octave whereas FM does not.
To make FM t... |
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VK6ZFG |
General Discussion
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5 |
4,104 |
12-11-2023, 12:30 PM |
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Thread: FM Deviation
Post: RE: FM Deviation
| Hi Steve
Yes, commercial mobile communication radios use 6 dB/octave pre-emphasis at the transmit end and 6 dB de-emphasis at the receive end to restore the signal back to the original one. The pre-... |
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VK6ZFG |
General Discussion
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5 |
4,104 |
11-11-2023, 11:31 AM |
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Thread: FM Deviation
Post: RE: FM Deviation
| HI Doug
With regards to the 5.0/2.5 kHz option I did allude to this trap but did not expand on this.
I originally did not go too far into the over deviation issue as I was only trying to address... |
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VK6ZFG |
General Discussion
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5 |
4,104 |
10-11-2023, 07:07 PM |
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Thread: FM Deviation
Post: FM Deviation
| Hi All
The other day I was listening to a QSO on 2M FM while mobile, One of the stations had the audio level so low that you could not tell they were talking. Only by turning up the volume to max... |
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VK6ZFG |
General Discussion
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5 |
4,104 |
10-11-2023, 03:08 PM |
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Thread: Station Earthing
Post: RE: Station Earthing
| Hi Scott
I would go ahead with the earth stake. It will provide an earthing path. You are fortunate in the soil type you have as it has a lower resistivity and as a result it is easier to obtain a ... |
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VK6ZFG |
General Discussion
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6 |
14,916 |
07-07-2023, 12:22 PM |
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Thread: Station Earthing
Post: RE: Station Earthing
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VK3RX Wrote: (02-07-2023, 04:08 PM)
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When I moved to the house here I noted that outside the room I'd selected to be the "shack" the copper mains water pipe came up from the ground and into a hole ... |
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VK6ZFG |
General Discussion
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6 |
14,916 |
03-07-2023, 07:29 PM |
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Thread: 12 volt power board????
Post: RE: 12 volt power board????
| Hi
I always solder mine. The only ones that are a pain are the larger 50A ones with heavy cable as they require a lot of heat to solder.
It is possible to incorrectly connect Anderson connector... |
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VK6ZFG |
General Discussion
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10 |
2,284 |
01-12-2022, 07:16 PM |
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Thread: Proposed amateur class licensing arrangements and high power operation Comnsult.31/22
Post: RE: Proposed amateur class licensing arrangements ...
| Hi All
The presence of AMC in the original documents struck me as being an obvious mistake which I presumed would be corrected in the subsequent redraft.
I was wrong.
AMC is not a federal... |
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VK6ZFG |
Regulatory, Licencing & Exams
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20 |
31,492 |
28-10-2022, 11:45 AM |
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Thread: FT8 Bots what exactly are they
Post: RE: FT8 Bots what exactly are they
| Hi All
While digital has many advantages it is not without its downside. It can readily remove the human element in communications. The FT8 Bot is an example of this.
If type of operating be... |
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VK6ZFG |
General Discussion
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9 |
2,526 |
04-09-2022, 11:02 AM |
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Thread: Broke the seal on my new Callsign
Post: RE: Broke the seal on my new Callsign
| From 2 to 5.
Looks like inflation has gone up! |
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VK6ZFG |
General Discussion
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2 |
1,322 |
29-05-2022, 05:29 PM |
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Thread: UPS with no RF noise?
Post: RE: UPS with no RF noise?
| For the circuit with the fuse built in, the power source (mains or genset) should be on the side of the filter feeding the fuse otherwise the fuse does not provide any protection in event of the filte... |
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VK6ZFG |
EMC, Interference
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10 |
8,139 |
28-05-2022, 11:17 AM |
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Thread: UPS with no RF noise?
Post: RE: UPS with no RF noise?
| I found that unless the cable is looped a few times around the ferrite core the suppression it is minimal.
Using one with suitable ferrite material is also somewhat important. |
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VK6ZFG |
EMC, Interference
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10 |
8,139 |
26-05-2022, 10:04 AM |
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Thread: RV television antenna patent and description.
Post: RE: RV television antenna patent and description.
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VK3LU Wrote: (23-05-2022, 09:57 PM)
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As keen caravanner I have often had a smile to myself when seeing the weird and wonderful designs of TV antennas on caravans. Some look as though they came from... |
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VK6ZFG |
General Discussion
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3 |
1,430 |
25-05-2022, 11:54 AM |
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Thread: VK6RTN New Geraldton 6M Beacon
Post: RE: VK6RTN New Geraldton 6M Beacon
| From memory???
I think it uses a beam. Pointing? |
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VK6ZFG |
AIS, Beacons, FM & TV DX
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6 |
7,647 |
06-05-2022, 03:29 PM |
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Thread: Anzac Day thoughts
Post: RE: Anzac Day thoughts
| Hi Doug
Your grandfather was on one of the first boats to land at Gallipoli but my other half's grandfather was on one of the last to leave.
From a letter of his published in the newspaper (obtai... |
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VK6ZFG |
General Discussion
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2 |
1,372 |
25-04-2022, 11:57 AM |
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Thread: Amazing Technology Developments
Post: Amazing Technology Developments
| Hi All
The latest developments in technology appear to have totally removed the need for VHF/UHF repeaters.
You can now get 300w vhf/uhf digital handhelds with 180km range that have a 50AH batte... |
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VK6ZFG |
General Discussion
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9 |
3,160 |
10-04-2022, 03:36 PM |
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Thread: Antenna Theory
Post: RE: Antenna Theory
| Russ
The coax matching length is usually a quarter of a wavelength though sometimes they use odd multiples. Single quarter wave give wide bandwidth but multiples results is narrow bandwidth. I had ... |
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VK6ZFG |
General Discussion
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2 |
1,541 |
08-03-2022, 06:41 PM |
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Thread: 60 Minutes: Finding MH370: New breakthrough
Post: RE: 60 Minutes: Finding MH370: New breakthrough
| Hi Peter
Interested your mention of Jindalee.
I happened to be the one who organised and supervised the evaluation of the testing for the SKA site to show there was a low RF presence at the locati... |
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VK6ZFG |
General Discussion
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8 |
2,036 |
27-02-2022, 10:13 AM |
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Thread: HFvertical radials...what is the most practical length of staple/pin/peg ?
Post: RE: HFvertical radials...what is the most practica...
| Hi Nev
I don't see the staples as being a good approach. They may present a problem later on when lawnmowing (just finished replacing the drive belt on my lawnmower!) and they might be a safety ha... |
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VK6ZFG |
LF, HF, MF
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3 |
4,557 |
26-02-2022, 12:11 PM |
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Thread: Diamond antenna ??
Post: RE: Diamond antenna ??
| Maybe the antenna is in the process of being installed? |
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VK6ZFG |
General Discussion
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1 |
1,321 |
10-02-2022, 11:14 AM |
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Thread: Mobile satellite antennas
Post: RE: Mobile satellite antennas
| Hi
An antenna well suited to the application is the Quadrifilar Helix Antenna as it is designed for satellite use. It does not have a null above it as usually found with vertical antennas which do... |
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VK6ZFG |
Satellites & Balloons
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6 |
1,601 |
22-11-2021, 02:44 PM |
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Thread: IC-7300 Spurious RX Freq Rejection
Post: IC-7300 Spurious RX Freq Rejection
| Hi
Measurements as taken on my stock standard ICOM IC-7300 Receiver on 18.11.2021
RX Freq mute Spurious mute Diff
MHz dBm MHz dBm dB
27.033 -128.8 97.000 -31.4 -97.4
28... |
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VK6ZFG |
Transceivers, Transmitters & Receivers
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0 |
1,256 |
19-11-2021, 11:58 AM |
