Grundig Satellit 650 Radio
spectrum.ieee.org
spectrum.ieee.org
Almost every paragraph has multiple technical errors of a fundamental nature.
" ... but it was equally capable with AM (about 510 to 1620 kilohertz, which was referred to as “medium wave” in olden times), and the spectrum below that once quaintly known as long wave (148 to 420 kHz), and also FM."
AM and FM are modulation modes, not frequency bands. For example, most shortwave stations also transmit in AM. And on course FM is used in many places besides the VHF Broadcast band.
The Medium Wave and Long Wave bands are not "quaint". Those are the international designations for those particular wave bands.
"The preselector is a mechanism for filtering out frequencies that are closely adjacent to the frequency the operator selects, minimizing the potential interference from other signals on those nearby frequencies".
Completely wrong. Close in stations are removed by the main IF filter. A Preselector is a manually tuned RF stage which is intended to remove Image frequencies and other spurious responses.
And to say that a Preselector is "rare, possibly even unique" is utter nonsense. Good quality radios have an automatically tuned RF stage, it's only in cheap radios that a manual control substituted.
And it's a Band-Pass-Filter, not a Low-Pass-Filter.
"Hams on various Internet message boards argue about the relative technical merits".
No they don't. This is not a specialised Ham Receiver. It was specifically designed for Short-Wave Listeners.
I could go on.
Medium Wave and Long Wave bands are not "quaint". Those are the international designations for those particular wave bands.
Why can't they be both "quaint" and international designations?
The wikipedia description of a "preselector" sounds close to what they described:
A preselector typically is tuned to have a narrow bandwidth, centered on the receiver’s operating frequency. The preselector passes through the signal on the frequency it is tuned to unchanged, or only slightly diminished, but it reduces or removes off-frequency signals, cutting down or eliminating unwanted interference. However, a preselector does not remove interference on the same frequency that it and the receiver are both tuned to.
"Hams on various Internet message boards argue about the relative technical merits"...No they don't. This is not a specialised Ham Receiver. It was specifically designed for Short-Wave Listeners.
Are you sure they don't? Are you claiming that there's no overlap between hams and shortwave listeners? Here's one:
https://www.eham.net/reviews/detail/526
Several of the commenters have their ham call-sign as their userid. So if there's just one more message board where hams discuss the unit, this statement can be marked true.
Aiming at non-technical audience means you need to make things simpler, not wrong.
Also, since when non-technical people hang out at ieee.org?
The article appeared in the monthly magazine of IEEE, the Institute of Electrical and Electronic Engineers, so the audience is not completely non-technical.
However, having seen IEEE's decline first-hand over the past 25 years, they are clearly dumbing things down a bit to cater for all types of audiences, including non-EEs. Even their website now just uses the slogan "The world's largest technical professional organization for the advancement of technology", and many of its articles now fall into the styles of those of retail science magazines.
Receivers of this type are pretty useless on the ham bands. You can't even connect a proper antenna to it (technically you can, but the unit would struggle with overload issues).
73s, dg3mg
You can find exceptions to any absolute statement (including this one), that doesn't mean that all absolute statements are wrong.
Humans will talk about anything and everything. Try and think of something that would never come up on HN, and then search for it on the search bar. 'My little Pony' returns a surprising number of results.
I think it's worth pointing out that the difference between AM and FM being modulation is right in their respective names: Amplitude or Frequency Modulation. It's very descriptive - not exactly rocket science.
It's also the description of a tuned RF stage, which any decent radio has. Except for cheap ones which make you manually tune it, and call that a "feature".
And read again what I said about the main IF filter. That's the one which removes adjacent stations.
Shortwave DX relies on ionospheric propagation. Solar particles cause ionization of the upper atmosphere, which becomes mostly opaque to shortwave frequencies. Activity on the surface of the sun follows a roughly 11-year cycle, with alternating periods of high and low activity. We're currently approaching the low point of that cycle, but the most recent cycle offered unusually poor propagation conditions.
There has been an overall reduction in shortwave broadcasting, but there's still plenty of activity in Africa and South-East Asia. You're not hearing it because it's all drifting off into space rather than ricocheting around inside the atmosphere.
Still listen to the 7600 almost daily - even as SW stations dwindle and the (lack of) solar activity does nothing to help matters, I still get excellent reception of the BBC World Service here on the west coast of Norway. (Which, much to my puzzlement, I still prefer to listen to on HF, even though it is available on DAB+, too...)
RIP little Grundig.
Here in the Netherlands, they now have a large range of cheap things, from button cell batteries to earbuds to remotes, cables, flashlights, cameras, navigation systems, you name it.
It's all ridiculously cheap (competitive with Aliexpress prices and sometimes better). Quality is not always great, but not as bad as it could be, and some things I've gotten are surprisingly well built (competitive with things 10-20x the price.) For example, a flashlight I got for 0.99€ with a solid metal construction that's survived whatever I've thrown at it so far.
And yes, they still make radios! Much lower quality, and not shortwave, but still.
The Grundig with the well deserved reputation for absolute top of the line quality and build is dead and gone.
Takeover was around 2007 so you could possibly have one of the last "proper" ones. No idea which particular products or if any old Grundig products survived a while longer. What shows up in search now is nothing like the type or quality I'd have once expected of the brand.
The device pictured in the article certainly does not invalidate that memory :)
It had an insane mechanical drum tuner which spread out the shortwave bands but over time it corroded and got flaky.