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Post by 238 on Jun 11, 2013 23:17:56 GMT -5
Is there a pot , in a Pearce-Simpson Guardian 23, that turns the mod up? 238
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Sandbagger
Administrator/The Boss 
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Post by Sandbagger on Jun 12, 2013 6:21:39 GMT -5
Is there a pot , in a Pearce-Simpson Guardian 23, that turns the mod up? 238 There is no modulation limiting capability in the Guardian 23, so there is nothing to turn up. Modulation should be smooth and warm with a decent microphone on it. If it's really low, that would indicate a problem. |
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Post by 238 on Jun 13, 2013 6:27:55 GMT -5
After reading the manual, I see you use a ma meter to tune the radio. I had peaked it up & it was doing 9 watts. Might have caused it sound distorted. Or maybe the crystal is off. The ones i talked to said it sounded off fq. 238
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Sandbagger
Administrator/The Boss
Posts: 6,249
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Post by Sandbagger on Jun 13, 2013 9:30:24 GMT -5
After reading the manual, I see you use a ma meter to tune the radio. I had peaked it up & it was doing 9 watts. Might have caused it sound distorted. Or maybe the crystal is off. The ones i talked to said it sounded off fq. 238 Well it certainly could be off-frequency due to the age of the crystals, but I'm more concerned about that 9 watt reading that you saw. Assuming that your meter is somewhat close to accurate, there is no way that a stock Guardian can be peaked to 9 watts of power. So there is something else at work here. It's possible that there is a spur that is power adding in the meter to cause the abnormally high power reading. A clue to this being the case is if, while you were adjusting something, the reading suddenly and sharply rose to that level from something more typical like 4 or 5 watts. There is a neutralization cap in there marked C8 on the schematic. That cap needs to be adjusted to remove those spurs, even if that means that 9 watt reading suddenly drops to 4 or 5 watts. Adjusting the spurs out is a job best accomplished with the aid of a spectrum analyzer. The other thing that may have happened, is that someone along the way jumped out the 2K ohm, 5 watt resistor which is shown, but not marked on the schematic. Jumping this resistor will jump the power up between 2.5 and 3.5 watts over the stock power level. It's great for giving you a little more dead key power, but it will do so at the expense of modulation percentage. I have a Lafayette Comstat 25 that someone had done this to when I first got it. I loved the fact that it would put out 6+ watts dead key, but it always sounded a bit on the muffled side, and I could only get about 85% modulation out of it. Once I removed the jumper, the power dropped back to 3.5 watts carrier and the modulation cleaned up and I could hit 100%. |
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Post by 238 on Jun 13, 2013 22:35:11 GMT -5
The first thing i looked far was a jumper. I will recheck the 2K. When i hook it back up i am going the tune it like the book says. I think the high watts is the problem. 238
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Post by gator7 on Jun 15, 2013 12:51:14 GMT -5
The gain from 3 or 4 watts is not worth the loss on modulation, I found that out the hard way. A 3.5 dead key sounds way better than a 6.5 one. My Courier 23 was flat toping. So i backed her down and like sandbagger stated 100% MOD. Wish I still had her.  73 |
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Post by BBB on Jun 17, 2013 21:18:33 GMT -5
I like the Guardian 23, rugged Ship-to-Shore AM CB radio. Made in Miami USA?
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Post by 238 on Aug 24, 2013 22:27:29 GMT -5
When I tuned it like the book said, things got a little more real. 4/5 watts.
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Post by cbrown on Aug 26, 2013 8:32:56 GMT -5
That is where it should be. Good job!
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