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Topic: 500 kHz

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In the News (Sat 20 Apr 19)

  500 kHz Memorial
Of course, 500 kHz was the frequency used by the RMS Titanic on April 15, 1912.
Since 1912, 500 kHz has been used by thousands of merchant ships to signal their plight in times of peace and war.
Whilst official operation on 500 kHz has been discontinued since 1999, the frequency is still designated as a distress channel in the International Radio Regulations.
www.southgatearc.org /news/april2006/500khz_memorial.htm   (392 words)

 International distress frequency - Wikipedia, the free encyclopedia
The nearby frequencies of 518 kHz and 490 kHz are used for the Navtex component of GMDSS.
International standards for the use of 500 kHz first appeared in the second Berlin International Radiotelegraphic Convention, which was signed November 3, 1906 and became effective July 1, 1908.
International standards for the use of 500 kHz were expanded by the Third International Radiotelegraphic Convention, which was held after the sinking of the RMS Titanic.
en.wikipedia.org /wiki/500_kHz   (952 words)

 Save 500 kHz!
500 kHz was the international maritime Morse Code radio distress frequency for most of the 20th century.
500 kHz was the frequency used by the RMS Titanic to send her plaintive cries for help that April night in 1912.
It is fitting that 500 kHz be preserved as a 'radio spectrum national park' to commemorate those who paid the supreme sacrifice in its use.
www.save500khz.org   (569 words)

 ARRLWeb: ARRL Granted Experimental License for 500 kHz Research by Radio Amateurs
He pointed out that 500 kHz -- the traditional maritime emergency frequency -- is roughly geometrically halfway between the 136 kHz experimental band and the 160 meter amateur allocation.
For about a century, the 500 kHz region was an important band for maritime communication, emergency and otherwise.
500 kHz remains designated as an official maritime emergency CW frequency, although the vast majority of maritime users have shifted to satellite-based operation for that purpose.
www.arrl.org /news/stories/2006/09/15/104/?nc=1   (857 words)

 [No title]
The rest of the US is waiting to see what happens; however, the trend is currently leaning toward the 1.7 MHz split with most of the states who are members of MACC moving to it by sometime in the year 2000 (and that is NOT that far away!).
Those using 500 kHz splits in the 51-54 MHz range are: California Florida* Michigan Nevada* Pennsylvania* Note-those states with (*) also have -1MHz splits on the air currently.
This would happen in the 500 kHz split where the user’s radio would have to cover from 51 to 53.5 MHz on transmit and 51.5 to 54 MHz on receive (Let me not forget to mention the simplex channels are all scattered throughout the three 1 MHz segments).
6mt.com /fm2bp.doc   (2313 words)

Other bands, each with 500 kHz tuning range, can be added by purchasing a crystal which comes with an adhesive transparent dial sector for that range.
The main tuning dial reads 0 to 500 kHz with 1 kHz graduation marks using two concentric transparent discs, 0 to 100 kHz is indicated on one disc and hundreds of kHz are indicated on the other disc.
An unwanted signal (modulated 30% at 1 kHz) removed by at least 20 kHz from a desired signal of 1 microvolt, must have a signal level of at least 10 millivolts to produce a noticeable cross modulation of the desired signal.
www.dproducts.be /Drake_Museum/spr-42.htm   (1715 words)

 CW on 500 KHz - Part 2 of 7
These markings were to aid the 500 kc operator in manually sending the distress auto alarm: key down 4 seconds, key up 1 second, key down 4 seconds, key up 1 second, etc., for one minute.
If digit 1 was dialed, the first red light would be lit, indicating our MF xmtr was on 500 kc in the A1 mode; if digit 2 was dialed, the second red light would be lit, indicating the transmitter was on 500 kc in A2, or MCW (modulated CW), mode.
During radioman school, we were instructed to attempt to log every signal we heard on 500 kc (an impossible feat), but at worst, make an entry every 5 minutes according to ITU regulations.
www.jproc.ca /radiostor/cw500pt2.html   (967 words)

 500 kHz still some way off (via CobWeb/3.1 planetlab2.netlab.uky.edu)   (Site not responding. Last check: 2007-09-18)
Of course, 500 kHz was replaced by the Global Maritime Distress and Safety System, or GMDSS, in February 1999.
Ships are no longer required to monitor or use 500 kHz for distress calls.
Their view is that 500 kHz must be preserved as a museum or historic frequency.
www.southgatearc.org.cob-web.org:8888 /news/august2006/500khz_some_way_off.htm   (253 words)

 Ireland seeks allocation in the 500 kHz region
The Irish Radio Transmitters Society recently submitted a proposal to ComReg (Ireland's regulator) for a small allocation to amateur radio experimenters in the region of 500 kHz.
The Ofcom report also indicates that an allocation to the amateur radio service in the vicinity of 500 kHz would be worthy of consideration.
The proposal made by the IRTS is similar to one being considered by Ofcom, which was made to it by the RSGB.
www.southgatearc.org /news/july2006/ireland_500khz.htm   (142 words)

 RWonline - RW Special Report
For almost a century, 500 kHz was a lifeline for ships worldwide.
Better known as 500 kilocycles, it was the spectrum reserved for ships and the shore stations that communicated with them in Morse Code (sometimes referred to as CW, for continuous wave).
Over the years, countless distress calls were transmitted and heard on 500 kHz, including those from the Titanic.
www.rwonline.com /reference-room/special-report/2006.03.29-07_rwf_500_khz_2.shtml   (835 words)

 ARRLWeb: ARRL 500 kHz Experiment in Organizational Phase (via CobWeb/3.1 planetlab2.netlab.uky.edu)   (Site not responding. Last check: 2007-09-18)
500 kHz experimental group Project Manager Fritz Raab W1FR (left) and Mike Gladu, N1FBZ, adjust the 500-kHz antenna tuner at WD2XSH/14.
NEWINGTON, CT, Sep 26, 2006 -- The project manager for the ARRL 500-kHz experiment, Fritz Raab, W1FR, says "The 500 KC Experimental Group for Amateur Radio" is still in the organizational stages.
The FCC's Office of Engineering and Technology on September 13 granted Part 5 experimental license WD2XSH to the ARRL on behalf of a group of radio amateurs interested in investigating the LF spectrum.
www.arrl.org.cob-web.org:8888 /news/stories/2006/09/26/101/?nc=1   (621 words)

 Other   (Site not responding. Last check: 2007-09-18)
After the war, shipping tended to move to the the HF marine bands for longer range communications, and the 100-150 kHz band was taken over for mainly fleet broadcasts for surface navies, and marine weather broadcasts.
The concept of utilizing the long range ground wave propagation occuring on 100 kHz and below for over-the-horizon oceanic navigation lead ultimately to the development of two major systems: OMEGA and LORAN C. Omega was based on using the frequencies between 10-15 kHz from 8 transmitters scattered around the world, providing a global navigation fix.
Another concept being advanced is to turn 500 kHz into an amateur frequency, due to its historical role as the morse code SOS frequency for ships for almost 100 years.
members.aol.com /trekkspill/other.html   (1967 words)

 Tektronix MBD: Products > 3026 Real-time Spectrum Analyzer : Characteristics
Spectrum Purity - -100 dBc/Hz (10 kHz offset).
50 kHz span: 503-tap FIR Filter with 4-stage Comb Filter.
500 Hz span: 459-tap FIR Filter with 4-stage Comb Filter.
www.tek.com /Measurement/Products/catalog/3026/specs.html   (450 words)

 Bio-Logic - Computer controlled Patch-Clamp amplifier - Visual-Patch 500   (Site not responding. Last check: 2007-09-18)
It runs a high resolution interface, with 16 bit analog to digital converters for built-in voltage or current storage on disk at up to 100 kHz, continuously, or during stimulation.
Four auxiliary channels can simultaneously be stored at up to 100 kHz for contraction, optical measurements or any other signal.
Sampling rate : 100 kHz, 50 kHz, 20 kHz, 10 kHz, 5 kHz, 2 kHz, 1 kHz and 500 Hz divided by the number of channels acquired (1, 2 or 5).
www.bio-logic.info /electrophysiology/vp500.html   (1625 words)

 RR-3 receiver
The use of this device assures the reduction of both front-end overload and intermodulation to a minimum.
Continuous coverage is provided by a frequency synthesizer which generates an injection signal every 500 kHz and a PT0 which tunes a 500 kHz range.
Continuous tune over each of the 500 kHz ranges.
www.dproducts.be /DRAKE_MUSEUM/rr-3.htm   (574 words)

 Norsat 500 Khz .7 Ku LNB | NS4507A
This site is controlled and operated by Primefocus.com from its offices within the United States of America.
Norsat 4507A - Professional Grade 500 Khz.7 Ku LNB or other materials in the site are appropriate or available for use in other locations, and access to them from territories where their contents are illegal is prohibited.
Those who choose to access this site from other locations do so on their own initiative and are responsible for compliance with applicable local laws.
www.primefocus.com /products/NS4507A.html   (477 words)

 Side Scan Model DF 1000
The most important feature of the DF-1000 is that sonar signals are digitized in the towfish, so there is no los of data over long cable lengths.
500 kHz data over 3000 meters of tow cable looks as clear and crisp as data received over a 50 meter cable.
400 kHz ± 20 kHz (referred to as 500 Khz)
www.uncw.edu /cmsr/capefear/tech/DF1000.htm   (140 words)

 Buck Regulator offers PWM switching frequency to 500 kHz Product News Network - Find Articles   (Site not responding. Last check: 2007-09-18)
This proprietary control method generates an internal emulated inductor current ramp which significantly reduces the noise sensitivity of the controller.
This allows the LM5005 to reliably control very small duty cycles so designers can take full advantage of the LM5005's wide 75V input range and 500 kHz frequency capabilities.
The programmable operating frequency can range from 50 kHz to 500 kHz.
www.findarticles.com /p/articles/mi_m0PIL/is_2005_Dec_16/ai_n15949612   (722 words)

 VLF Converters
Many receivers do not cover the VLF band below 500 KHz or, if they do, have greatly reduced sensitivity there.
When turned “On” the 10-500 KHz band appears at 4010-4500 KHz for general coverage radios (Model VLF-S) or at 3510-4000 KHz for ham-band-only radios (Model VLF-A).
Specifications: Input: 10-500 KHz Output: 4010-4500 KHz (VLF-S) 3510-4000 (VLF-A) Power: 9-v DC (battery clip on rear) Connectors: SO-239 Filter Rejection: 50 dB at 1-MHz I.F. Rejection: 85-dB Size: 2 x 4-1/4 x 5 in.
www.palomar-engineers.com /VLF/vlf.html   (178 words)

 Two 500 KC Low Pass Filter Designs (via CobWeb/3.1 planetlab2.netlab.uky.edu)   (Site not responding. Last check: 2007-09-18)
Construction of either design should be fairly easy, and at the proposed transmitter power output level of 100 watts, either air-core or toroid coils should probably work equally well.
This filter is designed to have an insertion loss of slightly less than 1 dB at 510 KHz.
All Pages, photographs, text or other data in any form on this Web Site are Copyright © 2005 by Ralph M. Hartwell II or their respective authors.
www.500kc.com.cob-web.org:8888 /500kc-lpf   (238 words)

 Forward Converters Drive Power MOSFETs At Up To 500 kHz
Simply by combining two simple circuits, high-gate-capacitance MOSFET transistors can be driven at up to 500 kHz with galvanic isolation (Fig.
The circuit consists of two forward converters—one converter to charge the gate capacitance and the other converter to discharge it.
Transformers T1 and T2 are built using Siemens N67 P11 x7 cores with three interleaved windings (to decrease the leakage inductance) of 10 turns each.
www.elecdesign.com /Articles/ArticleID/6217/6217.html   (548 words)

 CW on 500 KHz - Part 1 of 7 (via CobWeb/3.1 planetlab2.netlab.uky.edu)   (Site not responding. Last check: 2007-09-18)
By the way, NMO has the longest overwater microwave link in the world; Oahu to the island of Kauai for VHF marine band operations.
NMO was set up with the following glass-enclosed operating positions: 500 kc CW, HF CW, HF and VHF voice, air-to-ground, RTTY, Fleet Broadcast, landline TTY, and the Chief's desk.
From where the Chief RM sat, he could watch all of the ops to make sure no one fell asleep; pity the poor operator (op) who was caught sleeping while on watch!
jproc.ca.cob-web.org:8888 /radiostor/cw500pt1.html   (864 words)

 Tech5 bvba > news > 32 Channel 500 kHz USB (via CobWeb/3.1 planetlab2.netlab.uky.edu)   (Site not responding. Last check: 2007-09-18)
The DT9834-32 offers 32 analog input channels running at 500 kHz on High Speed USB 2.0.
This breakthrough product offers the OEM and end-user the opportunity to sample the large number of inputs required in their application.
The DT9834-32 enables the customer to sample 32 analog channels at an aggregate throughput rate of 500 kHz, something not possible until today.
www.tech5.be.cob-web.org:8888 /news/28   (318 words)

 EETimes.com - High-volt buck regulator switches at 500 kHz in auto, telecom apps   (Site not responding. Last check: 2007-09-18)
Santa Clara, Calif. - National Semiconductor Corp.'s LM5007 buck dc/dc regulator IC is said to break new ground with its ability to step down from an 80-volt primary-side power supply and produce a low-voltage (10-V typical) bias supply for secondary-side control devices at a cost of less than a dollar in large volume quantities.
Fully integrated with all the functions needed for a high-voltage power supply, the device contains an 80-V n-channel power MOSFET rated at 700-milliamps peak that can be switched at high frequencies of up to 500 kHz.
National said this lets a small output filter complete an efficient (more than 90 percent), cost-effective bias supply solution in a minimal printed circuit board space in next-generation telecommunications and 42-V automotive applications.
www.eetimes.com /story/OEG20030724S0017   (649 words)

 KB6NU’s Ham Radio Blog » Blog Archive » ARRL 500 kHz Project Underway (via CobWeb/3.1 ...   (Site not responding. Last check: 2007-09-18)
More information is on the 500 kc Experimental Group for Amateur Radio Web
The 500 KC Experimental Group for Amateur Radio is still in the
will be limited to 505 to 508 kHz for the time being, and the rest can use
kb6nu.com.cob-web.org:8888 /arrl-500-khz-project-gets-started   (443 words)

 MOSFET Drivers suit power supply applications over 500 kHz., Micrel Semiconductor I
MOSFET Drivers suit power supply applications over 500 kHz., Micrel Semiconductor I
MOSFET Drivers suit power supply applications over 500 kHz.
May 5, 2006 - Consisting of tiny single drivers for inverting and non-inverting solutions, Series MIC44F18/19/20 targets power supplies and synchronous rectification applications operating at frequencies up to 2 MHz.
news.thomasnet.com /fullstory/481829   (1035 words)

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