Johnythree

9 ms·

61.
by Johnythree 3y ago
Or before that, about every text conversation on Amateur Radio. CW (Morse), RTTY (Teletype), etc, etc.
62.
by Johnythree 3y ago
I have many fond memories of being a Point and running the Binkly Mailer. It's all been downhill since then
63.
by Johnythree 3y ago
> In retrospect, it was the harbinger of things to come with social media in general. > Take away the barrier of entry, let the masses in without any moderation, and it will turn into a cesspool. So much this. So many brilliant forums
64.
by Johnythree 3y ago
My favorite phpBB forums staggered along for many years but eventually collapsed. The problem was the original maintainers had long sense expired, and each new phpBB release caused cascading bugs and became unmanageable. That and the increa
65.
by Johnythree 3y ago
You have it backwards: Scam Contacting is just another way of extending the Gig Economy. Some professional people may be better off as contractors, but huge numbers of young people are being ripped off by being forced into irregular hours a
66.
by Johnythree 3y ago
> It's not possible to encode a higher-frequency signal over a lower frequency carrier.. Actually it is possible. AM modulation is just a matter of multiplying two frequencies together. It's just that the lower sidebands wrap a
67.
by Johnythree 3y ago
My old Landrover had a tap to swap between the two tanks. Leaving it in the center position saved the day a number of times.
68.
by Johnythree 3y ago
The push for employees to become a "Consultant, freelancer or independent contractor" was the hope from companies that they could unload many costs of business to their ex-employees. Things like phone rental, insurance, car runnin
69.
by Johnythree 3y ago
> With CW you're limited to two states: key and unkey This might be true for radio morse, but in the original Telegraph, each element was encoded by two clicks. One click when the morse sounder operated, and another click when the s
70.
by Johnythree 3y ago
This is correct, see my other comments. It is in fact the way that a standard telegraph sounder encodes Morse.
71.
by Johnythree 3y ago
For those who still don't understand how the Telegraph uses simple clicks to encode the alphabet.... Download "Morse Code Tools" from https://morse-code-tools.software.informer.com/2.1/ Then run "Mo
72.
by Johnythree 3y ago
You don't have to "slow down Morse". That is exactly how Morse is sent on a telegraph system.
73.
by Johnythree 3y ago
This is exactly correct. It amazes me that so many here seem to thing that the telegraph couldn't work because it only uses clicks.
74.
by Johnythree 3y ago
This is nonsense. Any experienced morse operator can copy the code from a morse sounder. The secret is that a Dit is "click/click", while a Dah is "Click....Click". It's all in the rhythm of the sounds.
75.
by Johnythree 3y ago
This is nonsense. The original morse sounders used a large relay which went "Click" when operated and another "Click" when released. There is no problem in sending morse via clicks. If there was, then the original telegr
76.
by Johnythree 3y ago
If "Morse code cannot be use to transmit message reliably over a pipe via tapping", then morse via the tapping of a sounder would also be impossible. The original morse sounders used a large relay which went "Click" when
77.
by Johnythree 3y ago
The whole point of the article is that there is no need for differentiation. eg just click/click is sufficient. There are two clicks for each element, and what changes is the space between the clicks. eg it's the rhythm which defi
78.
by Johnythree 3y ago
So sad to read the misleading stuff here. The original morse sounders used a large relay which went "Click" when operated and another "Click" when released. (some will argue that it's "Click-Clack", but th
79.
by Johnythree 3y ago
Their secret is variable speed compressors, advertised as "Inverter technology". The compressor run continuously, it just changes speed so there is no noisy and inefficient start-up surge current. Also common in heat=pumps, Air-co
80.
by Johnythree 3y ago
If the street lighting was truly in series, then the current would be the same all along the path. Perhaps you meant something different.
81.
by Johnythree 3y ago
The impedance of a folded dipole is 300 Ohms. And the impedance of a 1/2 wave dipole is 73.1 Ohms. However there are many other types of antennas see https://en.wikipedia.org/wiki/Dipole_antenna
82.
by Johnythree 3y ago
Most fast-charge algorithms generate an accurate estimation of the current battery capacity in order to terminate the charge cycle. Presumably this figure is available to the driver, or at least to a diagnostic technician.
83.
by Johnythree 3y ago
> did they purchase double the spectrum as those higher-frequency stations? Pretty much, yes. There are always guard bands allocated, plus careful calculations to avoid harmonics, intermodulation products, images, etc, which could interf
84.
by Johnythree 3y ago
That's not how it works: It's not just stations on the same frequency. There a rather complex set of calculations which avoid interference to adjacent stations, plus interference to other services via harmonics, intermodulation pr
85.
by Johnythree 3y ago
Amateur radio is by definition self-policing. The operators are required to keep their own frequencies clean, and will go to considerable length to do so. They have little interest however in interference involving CB, broadcast FM or simil
86.
by Johnythree 4y ago
There is nothing wrong with the quality of AM radio. It transmits almost the same audio bandwidth as does FM. The problem is the cheap and crappy radios designed for the USA market which have flooded the market. Whatever, try getting a high
87.
by Johnythree 4y ago
Well, yes, but only if the FCC doesn't insist on them meeting standard EM interference rules.
88.
by Johnythree 4y ago
I have a dozen or so DRM channels programmed into my SDR. Even a couple of MW AM ones. And I tune through them every day or two. The problem is that the performance of DRM is terrible. It takes a hugely strong signal before it is free of dr
89.
by Johnythree 4y ago
Yes, the Medium Wave AM band is quite narrow and wouldn't fit a single TV station, or a useful amount of Internet. That said however, there are lots of other systems which could fit in the MW AM band.
90.
by Johnythree 4y ago
The problem isn't in fitting an AM radio, but in suppressing the Electromagnetic interference from the Electric motors and circuity. Hopefully the FCC will wake up and insist that they fix the interference, and not just hide it by not

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