John, AD8IQ, has a question. Which is more important in an antenna system, the lowest SWR or the 50 ohm impedance? Watch to learn which
Read moreTag: frequency
Philippines Typhoon Nalgae — clear frequency requested.
Members of the Philippines radio society ( PARA ) are currently responding to the damage and loss of life caused by Typhoon Nalgae which struck
Read moreIs 222 MHz really a “forgotten” frequency band?
According to this month’s ON THE AIR podcast, 222MHz is considered the “forgotten” frequency band. A benefit to this band is that it’s relatively quiet
Read moreGraphical Frequency Allocations [ QST: Ask Dave August 2022 ]
Graphical Frequency Allocations Download and print PDF documents using Adobe Reader. Frequency Bands Chart [PDF] (8.5 X 11; grayscale) Frequency Bands Chart [PDF] (8.5 X 11; black/white) Frequency Bands Chart [PDF] (8.5 X 11; color)
Read moreBelgium: Military frequency use in the 6‑metre band
The Belgian telecommunication authority BIPT informs that a military exercise will take place in Elzenborn near the German-Belgian border until 18 June 2022, during which
Read moreResonant Frequency of Antennas
“The feedline to an antenna will perform better if the antenna has the same impedance. Jim Heath W6LG uses the RigExpert AA-2000 to measure a
Read moreIntroducing the ICOM SHF Project (Super High-Frequency Band Challenge)
Icom Incorporated (Headquarters: Hirano-ku, Osaka, President: Hiroshi Nakaoka) has been doing technical research on a new project to create a product from scratch by utilizing
Read moreUpdated Radio Frequency Exposure Rules Become Effective on May 3
The FCC has announced that rule changes detailed in a lengthy 2019 Report and Order governing RF exposure standards go into effect on May 3, 2021. The
Read moreI Found & Eliminated My QRM / RFI (Radio Frequency Interference)!
This is the third in a series of videos following my efforts to track down a source of local QRM / Radio Interference. Following the
Read moreReacting to Capacitance, Inductance, Resistance, Frequency
Reacting to Capacitance, Inductance, Resistance, Frequency Antenna W4OP Loop Antenna January 12, 2017 No comments It seems that more and more, amateurs are facing increasingly
Read moreHow to use Frequency Scanner to Search UHF MilAir in 2.3 seconds in SDR# using AirSpy R2
VHF 1240-1300 MHz discussed at CEPT SE 40 meeting July 14, 2020 No comments The 69th meeting of CEPT ECC Working Group SE-40,
Read more“June 2020 Festival of Frequency Measurement” Seeks Ham Radio Volunteers
Grad student Kristina Collins, KD8OXT, in Cleveland, Ohio, is looking for radio amateurs and shortwave listeners — particularly in Africa and Asia — to help
Read moreADALM PLUTO Frequency Expansion Modification Plus CPU Cores
“Here we take a look at the ADALM-PLUTO frequency expansion modification to give us 70 MHz through to 6GHz. Mine actually went as low as
Read moreMARS Military frequency list and schedule for nets MArch 31st 2020
DOWNLOAD .PDF LIST BELOW VHF Connect Systems CS120D UHF DMR | Newest DMR Handheld from Connect Systems March 31, 2020 No comments Read more
Read moreA Simple High-Frequency Communications Receiver
See What QST Has to Offer! QST is the monthly membership journal of ARRL. Each issue is your source for equipment reviews, technical tips, projects, news
Read moreOfficial QO-100 International Emergency Frequency!
Official QO-100 International Emergency Frequency! In order to coordinate potential emergency communications during the actual or any other crisis, the following frequency will be assigned
Read moreFrequency Charts
Information about the US Amateur Bands is available on the Frequency Allocations page as well as the frequency bands chart. Printing the band charts Download and print
Read moreIndonesia Earthquakes – Emergency Frequency 2019
Emergency Net on 7.110 MHz “A tsunami alert has been issued after a 7.4 magnitude earthquake struck off the northwest of Indonesia‘s Maluku Islands. The tremor was
Read moreFestival of Frequency Measurement Set to Honor WWV Centennial
HamSCI and the Case Amateur Radio Club of Case Western Reserve University (W8EDU) will sponsor a “Festival of Frequency Measurement” on WWV’s centennial, October 1,
Read moreYaesu FT 817 – CAT, CW decoder, waterfall, frequency readout, audio filter and audio recording.
What this lad has done with this screen for the 817 is astounding. CAT, CW decoder, waterfall, frequency readout, audio filter and audio recording. What
Read moreFrequency Measuring Test Success Does Not Require Sophisticated Equipment
In April 12, ARRL will conduct the Frequency Measuring Test (FMT), a tradition that dates back to 1931. In that era, prospective participants were promised
Read moreSynchronising VFO Frequency for Multiple tuners – SDRPLAY
“When using the dual tuners of the RSPduo, or multiple RSPs on a single computer you sometimes want them all tuned to the same frequency,
Read moreIndonesia Earthquakes and Tsunami – Emergency Frequency
The Indonesian National Society ORARI immediately established an Emergency Net on 7.110 MHz and also activated the Lapan-Orari IO-86 satellite as a back up.
Read moreFrequency Measuring Test Set for April 6 UTC
The April Frequency Measuring Test (FMT) will take place on Friday, April 6, 0100 until 0225 UTC (the evening of Thursday, April 5 in US
Read moreRevised ARRL Frequency Chart Now Available
An updated ARRL frequency chart is now available for printing and downloading at http://www.arrl.org/graphical-frequency-allocations. The chart has been updated to include our new bands at 2,200
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