Metox + QFH + Quoin Ridge + Pico Balloon (ZS1ERZ) update + Special Globes + More скачать в хорошем качестве

Metox + QFH + Quoin Ridge + Pico Balloon (ZS1ERZ) update + Special Globes + More

00:03:00 - French Metrox Device and Company - a little histoiry with Rex VK7MO 00:17:30 - 3D printed QFH antenna with VK7ZBX 00:27:00 - Retro Quoin Ridge - AR Action - Feb 1984 https://www.reast.asn.au/wp-content/u... https://www.criticalcomms.com.au/cont... 00:34:10 - Pico Balloons Update - launched by the Eden Radio Club in South Africa NOT New Zealand in August Callsign: ZS1ERZ - 74 days aloft _WOW Another callsign: ZS6SRC - 20 days aloft - WOW Operates during the day - Steve 7OO research On the 10M band using 20mW Picked up by VK7TAZ (clubroom) and VK7OO https://amateur.sondehub.org/#!mt=Map... 00:37:00 - Selection of Transmitting Valves Philips TC 1/75 N46 HF Triode (3) Era: 1940-1960s https://frank.pocnet.net/sheets/171/t... ~100W output 1000V plate Filament 10V 1.6A Anode, Grid, Cathode (filament) Simplest Valve - Analogy is the volume control (the grid voltage controls the gain) 00:40:10 - EIMAC 4-400A HF Power Tetrode (4) Era: 1940-1970s https://frank.pocnet.net/sheets/088/4... 6W in 800W out less than 75MHz 4KV plate voltage Filament 5V 14.5A Anode, Two grids (screen grid and control grid) and Cathode (filament) 00:42:50 - RCA - 4-250A/5D22 HF Power Tetrode (4) Era: 1940-1970s https://frank.pocnet.net/sheets/049/4... 3W in 500W out 3KV plate voltage Filament 5V 14.5A Anode, Two grids (screen grid and control grid) and Cathode (filament) Tetrode Problem: When electrons hit the anode, they can knock out secondary electrons, which are attracted to the positive screen grid instead of returning to the plate. This causes “secondary emission distortion” and a “kink” in the anode current curve — not ideal for linear amplification. 00:46:00 - EIMAC 5CX-1500B HF Radial Beam Power Pentode (5) Era: 1950-current http://n6jv.com/museum/data/EIMAC/arc... 10W in 1500W out Filament 5V 38.5A Anode, three grids (screen grid, control grid and suppressor grid) and cathode (filament) Force cooled PENTODE FIX - The suppressor grid (between the screen grid and anode) is held at a low or cathode potential and repels those secondary electrons back to the anode. This eliminates the kink in the curve, giving a smoother, more linear output, higher gain, and better efficiency. Random Topic 00:50:50 - Australian Space Weather Report: Hepburn for the next few days - https://www.dxinfocentre.com/tropo_au... Courtesy of the Australian Space Weather Forecasting Service - https://www.sws.bom.gov.au/Space_Weather Geomagnetic Warning - https://www.sws.bom.gov.au/Geophysica... HF Comms Warning - https://www.sws.SWS - Alerts and Warnings - Geomagnetic Warningbom.gov.au/HF_Systems/1/2/2 Current HF Fadeout - https://www.sws.bom.gov.au/HF_Systems... HF Fade out Warning - https://www.sws.bom.gov.au/HF_Systems... 00:51:00 - Future Training and Assessment Courses - Standard, Advanced & Regulations Assessment Days will be on: 29/11/25. 2026 Foundation Training and Assessment Days 21/02/26 11/04/26 27/06/26 22/08/26 24/10/26 Other Assessments Days 28/03/26 30/05/26 25/07/26 19/09/26 28/11/26 00:52:30 - Event REMINDERS 2025: Wed November 5th - Perspectives on Aust Broadcast Radio - Phil Tyson SPAT Wed November 12th - EMR Safety quiz night Wed December 3rd - EOY Sausage Sizzle/BBQ WAGs and WEGs 2026 Sunday January 18th - Huge Carboot Sale and Sausage Sizzle - QD Wednesday February 4th - Interpretation of Ionospheric Data for propagation prediction with Roger VK2ZRH Wednesday February 11th - First Forum Night of 2026 - WSPR Propagation Tools