His is an interesting video. The making of a vintage radio Philips (Tesla) T535A Sirius. The video was made in Czechoslovakia (1936) and is not in English but still interesting.
Showing posts with label radio. Show all posts
Showing posts with label radio. Show all posts
Tuesday, December 30, 2014
Friday, August 22, 2014
Build An AM Radio In A Box
Here is a great little project... an AM radio receiver with amplified speaker, using a 9 volt battery! Schematic is included. If anyone decides to build one of these, take pictures and take notes. It would make a nice follow up article.
Also, does anyone have a cool box, or an idea for a box to use for this project?
Wednesday, April 3, 2013
American Legion Amateur Radio Club
At our meeting last Saturday in Pittsburg, David KDØFBH from Iola provided information regarding a fairly new club known as the American Legion Amateur Radio Club. David relayed this information and invited all that can, to check in to their nets that are held the second Saturday of each month at noon central time, or 17:00 UTC time USB voice on 20 meters near 14.310 MHz. You can find more information and schedules at this link. Here is a video about a recent Special Event Station they operated. The American Legion Amateur Radio Club (TALARC) held their 2nd annual special event March 15-16, 2013 to commemorate the 94th birthday of The American Legion.
Please check out this information and check in if you can, and join as well. This seems like a fine organization to become involved with and support. Here is additional information about the club from their website.
About the American Legion Amateur Radio Club
The American Legion has formed a special entity to provide a forum for military veterans who today are engaged in a hobby that can also provide emergency communications "when all else fails." During the May 2011 Spring Meetings, the National Executive Committee authorized the establishment of The American Legion Amateur Radio Club (TALARC).
There are estimated to be 700,000 federally licensed amateur radio operators, or "hams," in the United States. Over the years, countless members of the U.S. military were trained as technicians or engineers, and later obtained amateur-radio licenses to continue to use their abilities at home, as both recreation and a public-service commitment.
"The beauty of amateur radio is that it attracts folks of all career interests, from doctors, Ph.D.s, engineers, rocket scientists to mechanics, housewives, construction and office workers, students and everything in between," says Robert L. Morrill, chairman of the Legion's Public Relations Commission. "Hams provide backup communications to emergency-management agency offices across the country when ‘all else fails,' and have done so with distinction in virtually every major disaster when cell towers and commercial communications have been knocked out after earthquakes, hurricanes, tornadoes, and man-made disasters."
The club has established an amateur radio station at National Headquarters with the call sign K9TAL (K9 The American Legion) in order to conduct special-event operations on The American Legion Birthday, Veterans Day, etc.; operate SKYWARN during local severe weather; and provide members an opportunity to operate the station during visits to National Headquarters. A special QSL card is provided to all amateur radio stations that work K9TAL on the air.
A special thanks to David KDØFBH for providing this information to the club!
73's and BTU, this is Kilo Delta Zero Sierra Echo Golf.
Please check out this information and check in if you can, and join as well. This seems like a fine organization to become involved with and support. Here is additional information about the club from their website.
About the American Legion Amateur Radio Club
The American Legion has formed a special entity to provide a forum for military veterans who today are engaged in a hobby that can also provide emergency communications "when all else fails." During the May 2011 Spring Meetings, the National Executive Committee authorized the establishment of The American Legion Amateur Radio Club (TALARC).
There are estimated to be 700,000 federally licensed amateur radio operators, or "hams," in the United States. Over the years, countless members of the U.S. military were trained as technicians or engineers, and later obtained amateur-radio licenses to continue to use their abilities at home, as both recreation and a public-service commitment.
"The beauty of amateur radio is that it attracts folks of all career interests, from doctors, Ph.D.s, engineers, rocket scientists to mechanics, housewives, construction and office workers, students and everything in between," says Robert L. Morrill, chairman of the Legion's Public Relations Commission. "Hams provide backup communications to emergency-management agency offices across the country when ‘all else fails,' and have done so with distinction in virtually every major disaster when cell towers and commercial communications have been knocked out after earthquakes, hurricanes, tornadoes, and man-made disasters."
The club has established an amateur radio station at National Headquarters with the call sign K9TAL (K9 The American Legion) in order to conduct special-event operations on The American Legion Birthday, Veterans Day, etc.; operate SKYWARN during local severe weather; and provide members an opportunity to operate the station during visits to National Headquarters. A special QSL card is provided to all amateur radio stations that work K9TAL on the air.
A special thanks to David KDØFBH for providing this information to the club!
73's and BTU, this is Kilo Delta Zero Sierra Echo Golf.
Saturday, March 16, 2013
What Are Software Defined Radios?
I thought this topic may be of interest to many of you and certainly one that we will discuss on the 30th. What are software defined radios also referred to as SDR? Here is a link and a clip from the article. I am learning still and I am sure this does not cover the topic nearly as well as it should, but perhaps it might spark some interest?
Software-Defined Radio, henceforth abbreviated SDR, is a fairly new development for radio receivers that started in the late 1980s. Its greatest strengths are flexibility and design simplification as compared to conventional ham radio receivers. SDR utilizes Digital Signal Processing (DSP) techniques to achieve signal clarity, which is difficult and expensive to do with conventional receivers.
SDRs receive the frequencies of an entire radio band segment at one time. Non-SDR receivers have tuned circuits that can only "look" at narrow slices of frequencies at a time, typically 2.8 KHz or less, but sometimes up to 8 KHz for AM reception. Compare that to software-defined receivers that are capable of taking in the entire high-frequency band from 1 MHz through 30 MHz. Because the signal is digital and has such a wide bandwidth, it allows the whole band to be displayed graphically, in real-time, on a computer monitor. This representation looks very much like what we saw using the Digipan software in the previous article. That is, a waterfall of signals, except in that case we were looking at only a narrow slice of a radio band provided by a conventional receiver set to its widest receiving bandwidth (or passband).
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| Photo and Link from http://casimiro.hubpages.com/ |
Software-Defined Radio, henceforth abbreviated SDR, is a fairly new development for radio receivers that started in the late 1980s. Its greatest strengths are flexibility and design simplification as compared to conventional ham radio receivers. SDR utilizes Digital Signal Processing (DSP) techniques to achieve signal clarity, which is difficult and expensive to do with conventional receivers.
SDRs receive the frequencies of an entire radio band segment at one time. Non-SDR receivers have tuned circuits that can only "look" at narrow slices of frequencies at a time, typically 2.8 KHz or less, but sometimes up to 8 KHz for AM reception. Compare that to software-defined receivers that are capable of taking in the entire high-frequency band from 1 MHz through 30 MHz. Because the signal is digital and has such a wide bandwidth, it allows the whole band to be displayed graphically, in real-time, on a computer monitor. This representation looks very much like what we saw using the Digipan software in the previous article. That is, a waterfall of signals, except in that case we were looking at only a narrow slice of a radio band provided by a conventional receiver set to its widest receiving bandwidth (or passband).
Here is a screenshot from the high dollar Flex Radio, these are amazing !
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