A reader of Do I ‘need’ a masthead preamp to work satellites on 2m? – space noise scenario has written to say he does not like my comments on the hammy adaptation of G/T. Above is an archived extract of a spreadsheet that was very popular in the ham community, both with antenna designers and … Continue reading Do I ‘need’ a masthead preamp to work satellites on 2m? – G/T vs G/Ta
Do I ‘need’ a masthead preamp to work satellites on 2m? – space noise explored a scenario for a high gain antenna pointed skywards. This article explores the case of a omni antenna which basically captures ‘terrestrial’ noise. Base scenario is a low end satellite ground station: 144MHz; terrestrial noise (satellite with omni antenna); IC-9700, … Continue reading Do I ‘need’ a masthead preamp to work satellites on 2m? – terrestrial noise scenario
A question asked online recently provides an interesting and common case to explore. Base scenario is a low end satellite ground station: 144MHz; satellite; IC-9700, assume NF=4.8dB; high gain (narrow beamwidth antenna); 10m of LMR-400. Last update: 15th September, 2021, 7:04 PM
Over the last two weeks, owenduffy.net has been moved from one Hosting Services Provider to another, domain registration, DNS, website, and email hosting. Despite efforts to make the transition transparent, some code in some calculators turned out to be less reliable on the new site and some changes made to make them reliable. QSRF was … Continue reading Hosting change
Further to the posting Quiet solar radio flux interpolations calculator… With a change in hosting and the changes to adapt to supported and unsupported features, one of the positives is that the ‘short term’ fetching of data on which Quiet solar radio flux interpolations calculator is based is now happening two hourly at 5 minutes past … Continue reading Quiet solar radio flux interpolations calculator
My Quiet solar radio flux interpolations calculator has been broken recently, a result of changes at NOAA where they withdrew the observation data on which the calculator was based. The data remains available on an FTP server, but my web server cannot access it for security reasons, and it would be unacceptably slow anyway. Last … Continue reading Quiet solar radio flux interpolations calculator
At (Bertelsmeier & Magnin 1992) formulas are given for calculating G/T from Sun/ColdSky Y factor in several Ham bands, and solar flux at 10.7cm. Last update: 14th May, 2014, 9:31 AM
DJ3JJ wrote up some interesting experiments with Yagis for 432 EME (Haefner 2010). Last update: 11th January, 2015, 9:44 AM
EMECalc v9.09 was opened, a model for 1296MHz created, and the “get IPS data” button pressed. The report shows solar flux at 1296MHz to be 106SFU. Last update: 11th August, 2014, 3:46 PM
K5SO published an article in which he reported measurements of Sun noise rise over cold sky for K5SO, W2UHI and VK7MO. Above is his graphical summary of the measurements. Last update: 26th April, 2014, 7:08 AM