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858 PLL Mods and stuff
- Thread starter 2RT307
- Start date
@unit_399
Although Jim no longer has the original site up archive dot org grabbed the page.
web.archive.org
Special attention to "word to the wise"
Locate Klondike Mike here or on ebay. These radios are 40 plus years old. Replace the electrolytics and the tantalum capacitors.
I have attached elsewhere the factory service manual. Go fish. or ask if you can't find it. It's full of information about it's audio processing.
There is a wee zener diode attached to the AM power regulator (a TO220 case) that is the easiest and best way to juggle the carrier.
The Uniden/RS/uPD858 chassis notorious for it's filter being asymmetric and moving around over the years. The published frequencies in the tune up may be obtained and the result be a smoking shit sandwich. If you need a generalized approach to spotting carrier insertion points see " Optimizing the HW101".
Any and all AM power, AM carrier, Controlled carrier, or suppressed carrier modifications are bullshit. Inject a two tone audio signal and record max output in SSB. Set your AM output to 25% of that.
Jim wrote the book on these. I just stayed at a cheap motel next to the animal hospital. Maybe Jim will stop by...
I do occasionally answer PM's
Oh, you're welcome. If I'm posting here I really need to get a life.
Although Jim no longer has the original site up archive dot org grabbed the page.
HOME | 858ssb
Special attention to "word to the wise"
Locate Klondike Mike here or on ebay. These radios are 40 plus years old. Replace the electrolytics and the tantalum capacitors.
I have attached elsewhere the factory service manual. Go fish. or ask if you can't find it. It's full of information about it's audio processing.
There is a wee zener diode attached to the AM power regulator (a TO220 case) that is the easiest and best way to juggle the carrier.
The Uniden/RS/uPD858 chassis notorious for it's filter being asymmetric and moving around over the years. The published frequencies in the tune up may be obtained and the result be a smoking shit sandwich. If you need a generalized approach to spotting carrier insertion points see " Optimizing the HW101".
Any and all AM power, AM carrier, Controlled carrier, or suppressed carrier modifications are bullshit. Inject a two tone audio signal and record max output in SSB. Set your AM output to 25% of that.
Jim wrote the book on these. I just stayed at a cheap motel next to the animal hospital. Maybe Jim will stop by...
I do occasionally answer PM's
Oh, you're welcome. If I'm posting here I really need to get a life.
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