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.

Sunday, November 23, 2014

My first coherer

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Recently the topic of the meeting of the Utah Amateur Radio Club was on "old" radio. Really old radio, which is to say "rad...

2 comments:

Wednesday, October 15, 2014

The "Pointless" 10 meter DSB QRP transmitter

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Figure 1: The slightly-modified "Shake Light" and the "pointless"transmitter. The flashlight portion still works! C...

1 comment:

Wednesday, October 1, 2014

What to do if your IFR 1200 Service Monitor display just shows "@" signs on the display - and if your deviation meter goes non-linear...

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Figure 1. A properly-working IFR-1200 in receive mode. A few months ago the old IFR FM/AM-1200S service monitor on the bench at work st...

18 comments:

Wednesday, September 17, 2014

Assembling the mcHF transceiver boards - getting ready.

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If you remember last time, a few of the parts were still on their way - but since then, all have arrived and I have assembled one set of boa...

Tuesday, August 19, 2014

YAFP - The mcHF SDR HF Transceiver

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Those who know me are already familiar with a four-letter acronym that I've used for many years: YAFP Which stands for: Y et A n...

1 comment:

Monday, August 18, 2014

Completely containing switching power supply RFI

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In the old days, radio amateurs were concerned with (or should have been) energy from their transmissions getting into devices unintentiona...

12 comments:

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