Johnythree

13 ms·

31.
by Johnythree 3y ago
Most any company in Australia.
32.
by Johnythree 3y ago
Many countries have Public Service Broadcasting. In Australia there is ABC, SBS, Community Broadcasting Foundation, Channel 31, etc,
33.
by Johnythree 3y ago
I still have a chunk of Skylab. Apparently the big oxygen tank was sawn up and small pieces potted in clear plastic with a commemorative card. A friend was passing through Esperance and bought on for me as a memento. see https://
34.
by Johnythree 3y ago
Re-sale of stolen dishes?
35.
by Johnythree 3y ago
The first to complain about an open network using encryption, would be the existing commercial users, eg cell phone companies, etc. And because the justification for using an alternative to commercial services would be to avoid paying licen
36.
by Johnythree 3y ago
Talk to your radio supplier, there are many encryption devices routinely used on VHF and UHF. Of course encryption is not impossible on HF, just a bit more difficult. Whatever, both commercial and military uses are using encryption on HF.
37.
by Johnythree 3y ago
> Nothing stops spammers from spamming on HAM right now Except the existing regulations, which is why spamming is relatively rare on Amateur radio. Occasional infringement does occur, but it is relatively easy to track down and deal with
38.
by Johnythree 3y ago
Occasional, random uses of encryption would not attract much interest. But as soon as some company sets up an encrypted node in a location that will attract users, there will be much interest in what it's purpose is. The whole point of
39.
by Johnythree 3y ago
In the past, customers were encouraged to be very inefficient with their electricity usage. Rather than fit efficient insulation, high consumption was tolerated for years to come. And thanks to the "Base Load" myth of coal based g
40.
by Johnythree 3y ago
Are you referring to AM/SW DRM, or VHF DRM? For AM/SW DRM, the "Dream DRM decoder" works fine for me. The trouble is that most of the Broadcasters have abandoned AM DRM. I just now did a quick scan. Of the 17 MW/SW
41.
by Johnythree 3y ago
Which is why PSK-31, WSPR, FT8, etc are so much more bandwidth efficient than CW. CW is wonderful, but is has long since been superseded by more modern digital modes.
42.
by Johnythree 3y ago
Hams sometimes used Audio Frequency Shift tones modulated on to an AM carrier as a temporary way of getting on air with an old style AM transmitter. Which of course meant two sets of sidebands (eg four in total) and a excessively wide signa
43.
by Johnythree 3y ago
> The sidebands of morse code carry no information and are incidental. The sidebands in CW ARE the information. If there were no sidebands, there would be no information. > When the key is down there is no modulation whatsoever. No, b
44.
by Johnythree 3y ago
Your "2.3KHz of bandwidth" is caused by using a wide SSB filter to send a relatively narrow shift of 170Hz. You equally could have used a narrower filter.
45.
by Johnythree 3y ago
The bandwidth of a CW signal depends very much on the bandwidth of the modulation, eg the faster the keying speed, the wider the bandwidth. "On the receive side, you can make your receiver as narrow at the transmitters oscillator"
46.
by Johnythree 3y ago
You are confusing the function of springs and shock absorbers. Yes, springs can be compressed, but that is their basic function. Shock absorbers on the other hand should be configured so that they never reach the end of travel. You seem to
47.
by Johnythree 3y ago
This makes zero sense:? If you hook a 240V appliance to 12V DC it will draw negligible current. Perhaps you are trying to talk about people using a 12V to 240V inverter to run AC equipment in a car or off-grid, but not using large enough ba
48.
by Johnythree 3y ago
The key would be the lack of interference, both from electrical noise and from other stations. Radio Amateurs are even today communicating world wide on the 630m MF band using much lower power and very modest antennas.
49.
by Johnythree 3y ago
After reading this thread, I'm amazed that no one has mentioned the work being done on alternative keyboards (and on alternative music notation). The main point is that the design of the piano has held beginners back for centuries, and
50.
by Johnythree 3y ago
This has been discussed a couple of times here: There seems to be little point in using Ham transmitters when there are a large number of very powerful Military transmitters already operating in the VLF band. Plus the monitors wouldn't
51.
by Johnythree 3y ago
I should have said that there are many problems with Baofengs and similar. Certainly spurious emissions are the big one. The manufacturers have made some attempt to fit LPFs for the ham bands, but simply don't bother for the bands that
52.
by Johnythree 3y ago
On-demand HWS can use heat-pump technology if required. Even tiny refrigerators use a heat pump. If they aren't widely used, it's because the savings are too small to warrant it. Regarding solar HWS: The cost of heating panels, pi
53.
by Johnythree 3y ago
Storage hot water is actually quite inefficient. On-demand heating has the advantage that there is no thermal loss due to keeping a large amount of water (plus piping) hot 24 hrs a day. Plus water is not wasted in waiting for hot water to a
54.
by Johnythree 3y ago
One of the reasons that the licensing authorities dislike the Baofengs is that they can be easily re-programmed (by unskilled users) to operate on most any VHF / UHF frequency. They are legal for use by licensed Radio Amateurs (because
55.
by Johnythree 3y ago
This is spin at best. There have been various systems which attempt to reuse existing frequencies by feeding them over un-shielded power lines. And as experts have warned so many times, it will always end up in tears. If you put radio energ
56.
by Johnythree 3y ago
In Australia the people once owned their own power grid. But then successive governments bought into the Neo-Liberal scam and sold it to their mates. And (of course) any investment in new technology promptly stopped, and prices have (of cou
57.
by Johnythree 3y ago
They can be easily recycled, but the key is that a small decline in efficiency is largely irrelevant if the energy is free in the first place.
58.
by Johnythree 3y ago
A flywheel can provide frequency stabilisation, or it can provide energy storage, but it can't do both at the same time. To provide frequency stabilisation is must be synchronised to the mains (eg run at a constant speed), while to pro
59.
by Johnythree 3y ago
Wireless is a seriously limited resource. There will never be sufficient spectrum available to support all the fixed services that are needed. And the heavier the loading, the slower the network runs. On the other hand, whenever you run a l
60.
by Johnythree 3y ago
There is no direct connection between the channel spacing, and the allowed TX bandwidth. If the bandwidth is wider than the channel spacing (for AM BC), all that happens is that adjacent stations hear a little "monkey chatter". An

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