Holy cow. This thread is about the Cobra 18. 
Headed home. If I can find my car.
Headed home. If I can find my car.
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Cobra 18 WX ST II (don’t laugh)
- Thread starter ForestRunner98
- Start date
Shadetree Mechanic
Delaware Base Station 808
Shadetree Mechanic
Delaware Base Station 808
Nope, my old school version is totally different. It says VR2 is the modulation pot but my pots have different numbers and the board layout is totally different. From the factory the modulation is set to about 90% so it could be turned up a little. Using another radio with no antenna and headphones as a monitor, you could turn it up until it sounds a little scratchy and then back it down a little.
Now, the 18RV and the 18ST 1st Generation - are different - one had "grey face" while the other 18 (later version) had just the ST suffix and had a Black Face but the ST unit was MECHANICAL switch - as well as the WX - but had a SCAN function for channels making it unique in performance and undocumented features - subjected to squeals and used VERTICAL BOARDS that broke - I have personal experience in that one - including it's frailty of surviving even a minor impact
So to get one that works, enjoy - they don't always survive the jostling you can get with vehicles in mobile setups...
So to get one that works, enjoy - they don't always survive the jostling you can get with vehicles in mobile setups...
Shadetree Mechanic
Delaware Base Station 808
Now that I’m only using a steel whip atop a 5-inch Hybrid Micro atop a 3-foot tripod and one wire radial, I am in full stealth mode.
I ain’t the only nascent writer hereabouts.
.
Mine are more Nebulous...
But in the midst of all the dust and debris - there are signs of coalescence....
As a buddy of mine is fond of saying, “Even a squirrel finds a blind acorn every once in a while.”
All of those different models of the 18 made me go look up my old one. It was the 18 Ultra.
Shadetree Mechanic
Delaware Base Station 808
I found out that the microphone on the ultra is an excellent mic. Clear and loud, louder than my 636. I transposed the AMC mod from the Cobra 29 and this old ultra is sounding great. Working on transposing the jp36 mod now. I will start a new thread when I get it all figured out.All of those different models of the 18 made me go look up my old one. It was the 18 Ultra.
They did have a good mic, those grey key ones. Got me wondering if that old radio is still around, so I had to ask her if she still has it 20+ years later...
Our feet stay stuck in the mud.
We endlessly debate Panama or Vibram boot soles.
You (on the other hand) have to pause, “oh, yeah, upright bipedals. Have to slow things way, way down”.
.
Shadetree Mechanic
Delaware Base Station 808
Thanks for the diagram,I just did this to my Ultra. I will add what I did in case anyone has one. The schematic is a little different, instead of putting it at L19, the Ultra is RFC301 and the negative side of the cap goes toward this coil. I ended up with 470uF and 220 ohms. This gives it a 1.5w dead key which makes a 30w dead key on the 203.I also did the AMC attack mod which makes the modulation limiter come on a little softer when it activates. I changed C503 to 4.7uF and with the pot all the way up, it would hit 20w peak. I turned the pot down so it gets about 15w, I don't want to be too hard on it. It still makes the 203 do over 150w peak. This radio is a real talker, I had no idea what it was capable of.
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