Recent content by nomadradio

We used to call that the "moron fuse". 6KD6: 8950: 73

Not to mention the underlying design. 73

We learn from mistakes, not from successes. You stuck with it, and you won't have to learn that lesson a second time. 73

A radio that's configured to use an electret mike is sending a DC voltage out the audio wire. If you can choose dynamic from the radio's setup menu, this might fix it. The SSK's cartridge is dynamic, but its output is amplified. The DC voltage feeding out of the radio upstream into the mike...

Stryker isn't set up for an electret mike, is it? Just a shot in the dark. 73

My antenna switch grounded the unused side of the antenna. Didn't seem to affect the side that was in use. 73

Cool! Turns it into a 2510. Complete with the low-level AM modulator and quirky control of the carrier. Just be sure to change the parts in the sideband AGC to make the receiver sound like a 2510. Sorta. Very ambitious and functional upgrade. 73

I want to spoof my caller ID so the phone displays "Hey, it's me. Pick up!" 73

Needs to be a bit above 3 Volts. 73

The side with the 3-legged transistors is the power supply rectifier and regulator. The black transistors are all wired in parallel, except one. The opposite-side heat sink contains the actual linear. Basically a 12-Volt mobile linear with a regulated power supply on the opposite side and the...

Or maybe just suck the solder off the collector pad and push the lead into the center of the hole. Isolating one lead is less work and risk than removing the part altogether. 73

It's a quirky circuit. The diode D9 is wired to rectify the modulation audio and feed a negative DC voltage into C144. Makes grounding the positive side necessary. The filtered negative DC voltage goes to the base of the PNP transistor just below in the diagram. The transistor's emitter is...

Yep. A fixed resistor with an electrolytic capacitor in parallel with it permits the full peak audio voltage to reach the driver while holding the carrier down. A NPN transistor in place of the resistor makes it variable. I know we put a carrier control into one or another new radio like that...

Don't tell me, let me guess. The owner drove it with a General Lee. There are three 1N4148 diodes and a couple of zener diodes that control the gate voltage on the MOSFETs. They can become collateral damage when MOSFETs fail. If they are damaged and the gate voltage is too high, you'll poof new...

Don't remember seeing a Nightwatch radio that wasn't also a Sound Tracker. The "NW/ST" schematic is in the CB Tricks Cobra section. The Cobra 29 Zoo is pretty populous, and not every version has full info out there. 73