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Posts Tagged ‘HF’

6×1 antenna switch

Thursday, November 30th, 2017

Mare published a new build: This is complete project for 1×6 antenna switch. It was bult in more than 50 pieces around the world and performs really good. Even big guns use it for their systems. The project was designed with help from other OMs (S55O, S59MA, S50LD, S51CT, S51ZJ,...

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Adjustable gain LNA

Friday, June 9th, 2017

Mare published a new build: Low noise amplifiers are very useful. I built one with single BFG425W transistor with adjustable bias current. Project info at Mare & Gal Electronics homepage.

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Mini CW Keyer / QRSS beacon v1.1

Tuesday, March 1st, 2016

Marko Pavlin has designed a PCB for the CW keyer, he writes: I designed dedicated PCB for the CW keyer. The project is very similar to the version made on prototyping board. Here are the updates: - I added relay and optocoupler for PTT control - The “CW melody” selection pins...

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Programmable CW Morse Keyer / beacon

Wednesday, February 17th, 2016

Marko Pavlin has designed a Mini USB dongle with STM32F0xx , he writes: Mini USB dongle with STM32F0xx is suitable many for simple, mini projects. I attached speaker to Timer14 PWM output (Pin PA6) and LED (or optocoupler connected to PTT) to GPIO pin PA0 The provided software is based on USB...

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Simple small QRO for HF

Friday, January 22nd, 2016

Marko Pavlin has been working on a HF amplifier project: I followed the ARRL Homberw challenge 50 watt aplifier entry. It is low cost, simple HF linear amplifier designed and built by the author as an entry in the ARRL’s 2009 Homebrew Challenge contest. The requirements of the amplifier were: 40...

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