Recent content by MKwrench

Is it more on LSB than in the other modes? The LB209 adjustable coils drift like a bum in the sun, and some are worse than others. I'm wondering if recentering their adjustment height because of our disabling VR6 and using the 470 ohm in ground has anything to do with it. The only other...

The .47uf in that spot does cause a small delay that can be seen on the scope. I used a 1M resistor from the ( - ) of C96 to ground to chill the DC that ends up there. But 1st a 10K from the same spot to pin 4 for the slightly flatter response I was looking for. We now have impressive...

I guess it was too big, I had no idea that could happen. It must have been like that for a while, I don't know why I didn't notice before... I tried a 2.2uf and a 1uf (which I thought was there), they both caused simular delays.

I wasn't going to have time until tomorrow morning, but plans change. I was exited to try Brandons suggestion of pre heating some of the 1156s nearby components. Before I grabbed the soldering iron, I wanted to look if any DC voltages on any of the pins changed during the "pump up", which could...

I did this on a hunch with a simular radio. Find test point 2 and measure voltage to board ground/ not chassis ground, on channels 1 and 40. Remember the number on 40, while keying slowly turn L13 to its max top and bottom while watching your watt meter for movement. record max and min...

I have fun posting these, I always hope someone can learn along with me, and maybe geta kick out of seeing these old radios come back to life. Here's another Sears Roadtalker, it's a 663.38070700 AM Radio. I had recently pulled a few radios off the shelf to make sure they work to put on...

Is the VCO voltage in check? It might just be out of lock. I think a failing channel switch can do this also by creating incorrect pin combinations. I feel we should hear a small POP when the power switch is cycled, so be prepaired for multiple issues. (or do they fully mute, out of lock?) I...

Theres a Neon Bulb with a 150pf in parallel before the SWR bridge. Does anyone know what thats about? .... A safety device maybe?....

This Roadtalker is back on the shelf until I feel more capable of verifying the integrity, bandwidth and center of the filter. Otherwise if a parts radio comes along I'm just going to Hail Mary it with the suspected goods. The adjustments behaved in a simular way in one of my 2-button...

I'm going to try monitoring while removing the probe. Just a satisfy that part of my curiosity. I did try to monitor at different spots too. I might button this one up until I get a parts radio or a VNA to put my mind at ease. Anyway I found that If anyone wants to pump up that modulation...

Thanks for getting back with me, I don't not have a VNA or a spectrum analyzer that I could do this with. If I did it would be my first time trying a sweep on a filter. These are tools that are next in line to treat myself with.

It's a 934.38270700 "Slantface Roadtalker 40. I've wanted one of these for a while, so when one popped up for peanuts I had to grab it. AM worked alright but showed only about 75% Modulation on a 3 watt carrier. Transmitting on the upper sideband sounded close to being in tune , but real bright...

https://www.westcoastmall.net/380051.html I ordered new faceplate/bezels from here a few times, I believe they used to be under $20. Check if you have AC voltage supplied from the lighting module at the ribbon connector (it might read as high as 90v), if so a new face will fix it. Otherwise...

3/16/26. Very weak today, I normally hear Europe and good chunk of what's around, in the morning. But nothing today ☹️, just "falling water" with bits of pepper in it.

Theres a similar page on the 010 chassis by 399, floating around out there too. https://senorjj399.wixsite.com/the-pb-010-chassis Not trying to steer off topic. He was relly cool for sharing his documented notes with the world.