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 Post subject: Sony ICF-6700W Stability- AC Versus Battery Power
PostPosted: Nov Sat 21, 2020 1:03 am 
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Location: Worcester Massachusetts
I have been running the 6700W on battery power, the internal (6) D Cells. As I have soon discovered, while a very sensitive radio, it does not seem to have great stability. Nowhere is this more evident than in SSB on the ham bands, where I do have to frequently adjust the tuning.

Might it be more stable using AC power? I have been using the batteries to potentially reduce noise. But am certainly willing to try AC if it would have any impact on stability.

Thoughts?

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 Post subject: Re: Sony ICF-6700W Stability- AC Versus Battery Power
PostPosted: Nov Sat 21, 2020 12:40 pm 
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I can't think of a reason reason not to try it. It has a built-in AC power supply. Wondering why you haven't tried it already.

Dave


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 Post subject: Re: Sony ICF-6700W Stability- AC Versus Battery Power
PostPosted: Nov Sat 21, 2020 3:24 pm 
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The set is still fairly new to me, and while I love it, it does seem somewhat unusually prone to manmade noise. I am going to experiment this weekend. In theory, I am thinking it should be somewhat more stable on AC. My Panasonic RF-2200 certainly is.

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 Post subject: Re: Sony ICF-6700W Stability- AC Versus Battery Power
PostPosted: Nov Sat 21, 2020 6:13 pm 
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Quote:
I am thinking it should be somewhat more stable on AC


Assuming the radio has a built-in regulator, it shouldn't matter AC vs. DC. As batteries age, their internal resistance goes up and results in lower voltage.

Stability on SSB may be more related to the Local Oscillator design and temperature variations. Does the radio have a BFO to receive SSB or a product detector?

Rich


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 Post subject: Re: Sony ICF-6700W Stability- AC Versus Battery Power
PostPosted: Nov Sat 21, 2020 6:51 pm 
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Location: Worcester Massachusetts
I have not gotten that deep in the weeds as of yet. I have the service manual, but the print is much too small. I would love to find someone who has used/owned this radio. In an unscientific experiment this afternoon, after about a half hour warmup, on AC, I did have much improved intelligibility and stability on 20 meters SSB. naturally, mileage varies dramatically on these "vintage" sets. It has been fully recapped and aligned.

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