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I start by unsoldering the center leg of TR43. If you hear no change, the culprit is an early-production TA7222P, probably a "P" and not the later "AP" version. Can't see that ID on the chip until it's removed anyway. If this kills the noise, replacing TR43 is the next thing to try. This...

There's more to it than just the PLL chip's specs alone. What model radio is this? The Sams CB books would mostly provide a guide to the particular divider arithmetic for a specific model. That's always been my starting point for a channel mod. 73

Mission creep? Rampant featuritis? Naw! I'd call it way cool! 73

This is what happens when a popular URL gets abandoned. Gets hijacked to obtain clickthroughs to malware sites. Probably bought it outright when it expired. Tsk. 73

After years of promising myself I'd update our discontinued 1990s PLL synthesizer I finally have a solution I can use. Troy Radio sells a handful of DDS solutions, but one of them is a bona-fide screaming bargain. Their "AM/FM-only" package provides a rotary encoder, nominal 1-inch OLED display...

That's what it is. A quarter Watt fits just fine. 73

The original Centralab product line got sold decades ago to a company called "E-Switch". They boosted the prices through the stratosphere. I need to dust off the wafers we kept after monobanding ham linears for the 11-meter hot-rod crowd. They figured out that it's a weak link in the chain when...

A heat sink on the rubidium box. Probably ought to do that to mine. 73

Hmm. Cobra 21. A 23-channel radio. Not made since about 1976. Cobra 21XLR. Made in 1978 Cobra 21GTL. Made in the early 1980s. Cobra 21 Plus. Late 1980s, a real dog. Cobra 21LTD. 1990s radio. "Cobra 21" is a bit like "Ford Mustang". Doesn't narrow things down all that much. Controls...

The switches I remember had a set of contacts on both sides, operated in parallel. Seems like they held up okay until the SWR got too high. 73

At the school of hard knocks. 73

That's how we test echo boards, pings and roger beeps before installing into a radio. Catching a dud before it's installed saves labor and frustration. That tester has appeared with more than one brand name on it over the years. 73

Bao Feng 2.0? 73

Spent most of my time on the ham bands rag chewing. Makes the most sense to have everyone's transmit frequency lined up together. Having to grab for the RIT knob every time a different station keys up gets old fast. CB radio clarifiers were originally tied to transmit and receive both. The FCC...

Roger that! 73

Don't ask me to code it, but a velocity-sensitive clarifier would be cool. The slower you turn it the smaller the steps become. Might eliminate the need for a separate fine and coarse control. 73

Adding lower channels to the Browning Mark 3 receiver requires a 31.1 MHz crystal and some rewiring. Gonna use the same module I showed for the Mark 4A. Adapting the ProgRock module to the Browning Mark 3 receiver is a bit more involved than the Mark 4A receiver. To start, it needs to rectify...

Too bad it can't unravel the CB Tricks forum's crashed database. Would be a AI training goldmine for that subject. 73

Might need to crack open the red pouch to see where wires go. 73

It will need an analog input for the clarifier, but as I understand it, he's tackling that feature. The "Progrock" board I'm using comes from Turkiye. Yeah, that's how Erdogan wants it spelled nowadays. Has no feature to make it slide, but so far it does what we need it to do. Doesn't need a...