Ham Radio

FT-991 Hardware Upgrade Kit

Final update: See my upgraded FT-991 in action here. I bought a Yaesu FT-991 transceiver last year. Shortly after that, Yaesu decided to surprise us (me) by releasing the FT-991A, for more or less the same price as I paid for the FT-991, and slashed the price of the FT-991, immediately devaluing my new purchase. […]

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Handheld Power Obsession

Or, also known as “linear units in a logarithmic world”. Among the cheap handheld radio community, especially after the release of the Baofeng BF-F8HP, there seems to be this huge obsession with RF transmit power. Yes, the BF-F8HP is rated at 8 Watts on its maximum setting, but what do you really get for that […]

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FTRestore

The other evening, I decided it’d be a good idea to update my FT-991 with the latest firmware. Aside from this being a good idea generally, to keep up with the latest and greatest improvements to the FT-991, I’m a hopeless early adopter, and I like to try new things. I wonder when they’re going […]

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2-FSK

Frequency Shift Keying (FSK)

Almost everyone has heard of FM, but not everyone has heard of FSK. Frequency Shift Keying is a modulation scheme which utilizes changes in the frequency of the carrier wave to communicate data. For example, you can see the change in frequency in the image to the right. The lower frequency may indicate a “1” […]

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Why 50 ohms?

Coaxial cables, antennas, amplifier inputs and outputs, typically have either a 50 ohm or 75 ohm characteristic impedance. Why? It all comes down to the characteristic impedance value for maximum power transfer being 30 ohms, while the characteristic impedance for theoretical minimum attenuation (loss) is 77.5 ohms. 50 ohms is more or less in the […]

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Baofeng UV-5R+ Harmonics

It seems that the ARRL and a number of individuals have been taking a serious look at harmonics and other spurious emissions from various ham transceivers, including the ubiquitous Baofeng range of handheld transceivers. So, a while ago, I decided to take my Baofeng UV-5R+ to work and see what mine looked like. I don’t […]

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