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.

Wednesday, December 30, 2015

Adding FM transmit to the mcHF transceiver

In previous postings I wrote about how FM reception - including squelch and subaudible tone detection - was accomplished on the mcHF. As is...

Thursday, December 17, 2015

Minimizing VHF (and HF) RFI from electronic ballasts and fluorescent tubes

Several years ago we started replacing the old, "iron" ballasts with T-12 fluorescent tubes at my work with T-8 tubes and electron...

Friday, November 20, 2015

FM squelch and subaudible tone detection on the mcHF

In a previous installment ("Adding FM to the mcHF SDR Transceiver" - link ) I described how the demodulation of FM signals was ad...

Monday, November 9, 2015

Repairing the TUNE capacitor on the Heathkit HL2200 (SB-220) amplifier

Figure 1: The front panel of the HL-2200 amplifier - which is really just a slightly modernized version of the SB-220. Click on the im...

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