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Got a request from a customer. Wants a how-to for the diode swing mod applied to a RCI2995DX. The surface-mount main circuit board has the same basic circuits as the older 2950/70/90 radios, just laid out differently. The bill of materials is: 1) 1N4148 small signal diode. There are any...

https://packaged-media.redd.it/av5h4bup3usg1/pb/m2-res_720p.mp4?m=DASHPlaylist.mpd&var=sgpssan&v=1&e=1775556000&s=5c064594f80341298dbc7e1fd6e66ab8314b6208 A cheap chuckle. 73

The Browning Mark 4A receiver has one crystal for each band it covers. The factory installed one at 22.82 MHz for channels 1-27 and 23.14 for channels 28-59. There was a crystal available to cover 32 channels below channel 1, 22.5 MHz. They were available for years from Barkett Electronics...

Here is the other half of the lower-channel mod for the Browning Golden Eagle Mark 4A. The receiver this time. The receiver comes with two tuneable bands and one "fixed" crystal receive frequency. The crystal socket is part of the front-end circuit board. Adding a third tuneable band requires...

This guy persuaded me 47 or so years ago that I'm not cut out for the SHTF apocolypse. YMMV 73

Here's the breezy version of extra transmit channels for the Browning Mark 4A transmitter. Not the Mark 4. Different transmitter altogether. This setup requires two toggle switches and wire. One DPDT on-on switch and a SPST switch. Or any substitute. The focus of this trick is nine...

So here's another idea that hasn't quite graduated to half-baked. More like half defrosted. Back in the day, if the hired help had a slow day, he would put together parts kits for rehabbing the tube CB radios. The pieces they would need is predictable up to a point. But there is always a fixed...

A pretty good HD restoration 73

Don't know if this story has reached this forum yet, got a link to this story from an old pirate-radio pal. Yeah, Steven's old. My advice is to steer clear of Belarus. https://tech.slashdot.org/story/26/01/21/2018229/ham-radio-operators-in-belarus-arrested-face-the-death-penalty I'm sure...

The RCI29 "10-meter" base radio is built into the same cabinet used for the Galaxy (RIP) DX2547 40-channel CB. Has the new circuit board used in the X9 and other models. This customer complained that the Tone knob didn't do anything. It's not strictly a "tone" control. Technically it's only a...

A long-time customer talked me into fixing his UR5QW equalizer/echo/etc audio gadget. Looks cool enough. Said it went totally dead. No output of any kind. And no schematic to be found. Sure enough, there's a tiny part that looks like either a surface-mount fuse or a PTC protector in line...

Someone requested the truth chart for the Cobra 142GTL and I neglected to make a note of where that was posted. Can't find that thread right now. I scanned it, and it occurred to me that a little explanation might be helpful. The column marked Divider Input is the frequency you'll see at pin...

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Well, okay. Maybe the title is a little over the top. Even so, parts suppliers I have relied on for years are falling by the wayside month by month, year by year. All Electronics was a reliable source of 'second-source' electronic parts. Prices were a fraction of the regular catalog sources...

The clock/counter in the 1978 Cobra 2000GTL had a design boo-boo in it. They connected the output from an analog chip into the input of a digital chip. Turned out not to be too reliable. Enter Technical Service Bulletin 1232. It shows how to fix this tiny flaw with one disc capacitor and two...

For decades radios with features not legal for 27 MHz CBs have entered the country as "10 meter" transceivers. Typically the Galaxy, RCI, Connex and such brands will be intentionally crippled on the inside before shipment, and get "un-crippled" to cover 40 CB channels once the radio is safely...

Had some requests for an upgrade kit to replace the relay in the Browning 180 base linear. It was legal for Browning to sell, because their 1960s radios were type accepted for a business license. No joke. Had one customer in 1975 that was licensed for 27.320 MHz. Had a Browning Mark 2 base...

Lazarus! Arise from your back burner. A few years ago I posted a project that shrinks the 9/16-inch digits on the SanJian PLJ6-LED frequency display so it fits behind the dial window of a Siltronix 80/90 VFO or the VFO window of a Tram D201. And then reality set in. Removing the big digits...

The old saw goes "Measure once cut twice. Measure twice, cut once." Lost track of how many times I advised someone to check the base voltage feeding to a new replacement final before soldering that lead to the pc board. Shoulda taken my own advice. Customer states no transmit from his Cobra...