KA7OEI's blog

Random musings - usually on a technical (nerdy) subject - perhaps related to amateur radio and things found at ka7oei.com and modulatedlight.org. No AI is used to generate this content.

Tuesday, April 4, 2023

Exploring the "1-930MHz 2W RF Broadband Power Amplifier Module for FM Radio HF VHF Transmission" found on EvilBay

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Figure 1: The amplifier - with heat sink. Click on the image for a larger version. On EvilBay, you can find a number of sellers of a device ...

5 comments:

Saturday, March 4, 2023

Injection locking cheap crystal "can" oscillators to an external source

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Figure 1: The two generic "can" oscillators tested - both having been found in my "box of oscillators". Click on the ima...

Friday, February 10, 2023

"CQ CQ - Calling all dielectric welders!" (Or, those strange curvy things seen on a 10 meter waterfall)

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If one owns a receiver with a waterfall display, the increased cluttering of the 12 and 10 meter bands with weird "swooping" sign...

Monday, January 30, 2023

A 2 meter band-pass cavity using surplus "Heliax"

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Figure 1: Close-in responses of various filter combinations Yellow: Duplexer-only Magenta: Bandpass-only Cyan: Duplexer + Bandpass Click...

1 comment:

Wednesday, December 28, 2022

Exploring the NDK 9200Q7 10 MHz OCXO (Oven-controlled Crystal Oscillator)

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Figure 1: The NDK 9200Q7 OCXO. This unit, pulled from used equipment, is slightly "shop-worn" but still serviceable. The multi-...

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