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40 results for 'y case'

    5 Most Popular HF Portable Antennas(Post)

    I carried out a survey in early 2014 to try to discover which portable HF antenna was most popular. Just over 300 people responded. They were asked to choose their "favourite portable antenna" fro ...

    Using two sychronised WSPRlites and DXplorer to measure a known power difference(Post)

    Today, April 23rd 2017. I carried out a similar experiment to yesterday but with WSPRlite G33CWI reduced in power by 3dB compared the WSPRlite G31CWI. 57 simultaneous S/ ...

    Strength Rating System for Telescopic Fibreglass Masts(Post)

    People often ask me how mast X compares with mast Y in terms of strength and flexibility. It's hard to be objective but in an attempt to do so, I have developed a simple rating system.The SOTABEAMS M ...

    Bias-T for LNB - a few notes(Post)

    A bias-T is required to feed DC and control signals to a satellite TV LNB. This allows the co-axial cable that transports the signals down from the dish, to be used to power and control the LNB. The ...

    FT-817 filters - how good are they?(Post)

    Using a noise source and a QA400 audio analyser we tested the filters in an FT-817.Stock Ceramic SSB filter: surprising poor skirt selectivity. Probably the result of insufficient isolation between t ...

    Baluns Explained(Post)

    First published in the SOTABEAMS Newsletter 30 March 2018. If you like this article, why not sign up to our newsletter? It comes out about monthly.Baluns explainedThe word balun is shorthand for a ba ...

    Comparing two small transmitting loops (preliminary test)(Post)

    This is a preliminary experiment to compare the performance of two commercial small transmitting loops on 14 MHz. The loops were set up in a suburban garden, 20 metres apart. They were aligned with t ...

    Are antenna tuners always lossy?(Post)

    First published in the SOTABEAMS Newsletter 26 July 2016. If you like this article, why not sign up to our newsletter? It comes out about monthly.A few thoughts on Antenna TunersWhen the subject ...

    Using WOLFWAVE in an SSB contest(Post)

    When I tuned to 80m last night I discovered that there was a contest in full flow. It seemed like a good opportunity to show the difference between a basic noise reduction system and WOLFWAVE ...

    Measuring co-ax cable loss(Post)

    A friend contacted me yesterday. He was having some problems with his portable 2m set-up and wanted to get the feeder assembly checked. He wondered if the cable had degraded over many wet hilltop ...

    Ham Radio Operating from Hotels(Post)

    I am often asked for tips for operating HF radio on the amateur bands from hotels. This is something that I have done a lot of in the past and it can be good fun. It always gave me something interest ...

    How try a mag loop before you buy a mag loop...(Post)

    Small transmitting loop antennas "magnetic loops" have become very popular. There is no doubt that they can provide good performance for their small size. While they are easy to build if you have (or ...