Recent content by nomadradio

Um, it only accelerates. Buckle up. When my parents were young, the mystique of long-distance wireless communications was borderline magic. Think "Hardy Boys and the Shortwave Mystery". By the time I was old enough to put up an antenna and a station, it was a hangout. Pretty much a thing...

News you can use. I'm relieved to hear at least one company in this business understands the value of customer loyalty. Thanks for the update. 73

The Toshiba TA7222AP was used in Uniden-built and RCI-built CB and (cough) 10-meter radios for decades. But if you look inside a pre-1980 Cobra, President, Teaberry, Robyn and other 1979 models you'll find the original, older version the TA7222P. No letter "A", just a "P" suffix letter. But...

There's only one circuit that sets the receiver's frequency. No receive crystals at all, just the dial VFO. I count four 'black box' printed-circuit modules. Those were a real headache servicing TV and audio back in the 70s. If one part inside fails, you may have no way to test that one part...

Only applies to a stable amplifier. And that's my main gripe about Maco's built-in driver stages. They oscillate and spew all manner of frequencies the radio has no idea about. Grounding the shield of the output coax and placing a Faraday shield between the driver and final tubes up topside goes...

Mission creep. One good idea leads to another. 73

The chrome plating on the front half of the clamshell kinda gives it away. 73

I suspect that they end up installed in lavishly-expensive replicas of General Lee. If you have the money for that kind of toy, the CB is just another accessory. 73

Pretty sure the 78X is the model featured in the Dukes of Hazzard. They get offered for stupid money on fleabay. No idea what people actually pay for one. 73

Well dern the bad luck! I went to the current PA0FRI.com/mods page and when you hover the cursor over the link that says "TL911", your address bar will say "TL922". And that's the file you'll see clicking on the link. The 922, not the 911. Oops. Whoever moved this web site to the new location...

Haven't looked at the diagram for that one, but I can offer a possible limiting factor. The PLL's VCO gets mixed with a crystal. The difference between those two frequencies is low enough for the PLL to keep up with. Max input frequency for the PLL02 is around 3 to 5 MHz IIRC. Between the...

Looked about for the tech data needed to work it out. Still looking. 73

No need to unhook the radio. Just need to key the relay without drive power from the radio. Thanks for pointing this out. Too easy to make assumptions about what the reader already knows. 73

I haven't looked inside a SB401 in 40 years, so all I can offer is a best guess. Start with the power supply, where the B+ branches off. If you have a 'scope that would be an unfair advantage. I suspect you would see a lot of rectifier ripple where you should fairly-flat DC. This causes DC...

Rock on! Gotta love it when a plan comes together. Congrats for sticking with it. 73