QRPblog

A 600W broadband HF amplifier using affordable LDM...

Posted by Razvan | Oct 27, 2019 | In the shack | 78 |

Yaesu FT-4X review (it is after all a Baofeng)

Posted by Razvan | Sep 5, 2018 | Reviews | 22 |

Icom IC-7300 review

Posted by Razvan | Mar 14, 2016 | Reviews | 26 |

Icom ID-52 VHF/UHF D-Star Handheld Announced

by Razvan | Aug 7, 2020 | News | 14 |

Icom ID-52 is the latest VHF/UHF D-Star color screen & Bluetooth handheld transceiver released by Icom, replacing the ID-51PLUS2.

What’s wrong with ham radio

by Razvan | Jul 15, 2020 | In the shack | 57 |

This is an amazing hobby and has many sides to it, but as anything it’s far from perfect. A...

B1500 – Backpanel Unit for RF power Amplifiers

by Razvan | Mar 29, 2020 | In the shack | 1 |

The B1500 RF amplifier Backpanel Unit is designed to sit between a LDMOS RF amplifier and the rest...

Icom IC-705 coming in April 2020, price announced

by Razvan | Dec 18, 2019 | News | 0 |

The new Icom IC-705 should be available starting April 2020, with a MSRP of 124,800 yen + tax. As...

F600 – a 600W low-pass filter board for 1.8-72MHz

by Razvan | Dec 16, 2019 | In the shack | 5 |

This design offers a practical solution for HF/low-VHF amplifier output filters, handles 600W and...

Choosing a heatsink for the A600 LDMOS linear amplifier

by Razvan | Dec 11, 2019 | In the shack | 0 |

For optimal performance, the heatsink should have a thermal resistance of 0.1C/W or better at full...

A600 v2.0 amplifier module – changes and improvements

by Razvan | Dec 9, 2019 | In the shack | 9 |

I have recently made available a new version on the A600 amplifier based on MRF300 LDMOS...

A 600W broadband HF amplifier using affordable LDMOS devices

by Razvan | Oct 27, 2019 | In the shack | 78 |

Update: this project is evolving. See this page for the latest version. Kits are available in the...

Icom IC-705 – considerations on RX power draw (wild guesses ahead)

by Razvan | Sep 2, 2019 | In the shack | 4 |

I’ll try to put together a breakdown of IC-7300’s sections and how much power those use and try to see how Icom could’ve tweaked those to make the architecture “portable” for the IC-705.

Icom IC-705 HF/VHF/UHF portable SDR transceiver – full details

by Razvan | Aug 30, 2019 | News | 24 |

IC-705 has just been unveiled by Icom at the Tokyo Ham Fair. This is a portable HF/VHF/UHF transceiver featuring SDR technology, internal battery, GPS, Bluetooth and D-STAR. Output power is 10W on external 13.8V supply or 5W on internal battery.

Yaesu FT3D – new flagship VHF/UHF handheld

by Razvan | May 15, 2019 | News | 1 |

Yaesu FT3D is the next flagship VHF/UHF handheld; features a full color touchscreen display, Bluetooth and many other goodies already present on the FT2D.