Recent content by nomadradio

Should match up with the Galaxy DX11B schemo from CB Tricks. Pin 54 is receive-only 8-Volt power from R141. If the red wire goes to the clockwise lug of the rear half of the clarifier control, this is where it was connected. To make the receiver and transmit frequencies "lock" together on the...

Since the PLL is a DC circuit, set the vertical position knob to put the baseline on the bottom line of the screen. For the 5-Volt PLL circuits, set the Volts/div knob to .1 if you're using a times ten probe. The red inner knob turns full clockwise. Pretty sure it clicks all the way to the right...

Get 'em hot enough, and the flavor of the solder won't matter. A tube with a brown bakelite ring under it offers a clue when the brown turns dark around the two filament pins. 73

Okay, so I've lost track of this thread. Just what fault are we chasing? 73

Nothing a trimpot with a high enough resistance can't cure in series with the meter coil. 73

Can't assume there is only one cause. That capacitor needs to be soldered in, for sure. Once it's connected, it should be peaked for max modulated power NOT just the silent carrier. How much carrier do you have coming out of the radio, and how much coming out of the amplifier? The MRF455 is...

Holy moly! Open source to the rescue. 73

Google is your friend. On a good day, at least. Only offered me one source today...

Tough to troubleshoot without a schematic. 73

Motorola data sheet from RF Parts. Says it's a MRF454 selected for performance measurements. 73

A display that won't clear itself before showing a sign-on "hello" probably has a hardware problem, not a firmware fault. One reason I stopped repairing hand-held electronics years ago was because most repair problems are caused by being dropped. I'll guess there's a mechanical failure somewhere...

Bear in mind that you're correcting boo-boos in the original 1970s design. Not a lot of attention was being paid to the amplifier's input impedance back then. You'll want to put a SWR meter and extra coax jumper between the radio and the amplifier's input jack. If the reading is much over 2 to 1...

Seems like the present takes up more and more of my time to cope with it. The future gets less and less attention, seems like. No apprentices in these parts. The occasional curious young person comes around. I just tell them I'm a hardware dinosaur waiting for the asteroid. 73

Opened in 1969? Got me beat by six years. Has to be really old by now. I wish his comeback all the luck in the world. Personal experience with folks in this sort of spot hasn't gone well, for the most part. 73

Cool! Welcome back. 73