SB-301 bfo adjustment

[Dave Edwards]

I'd be curious to hear from Heath owner's who have done these mods. I know
my Heath stuff always had a thin, tinny sound on receive. Back in '75, that
is why I traded mine in towards a TS520. The SB's and HW's always had a
sound that gets tiring to listen to after a fairly long time. A
characteristic that the KWM2 or TR4 series do not exhibit.
...Dave

----- Original Message ----- 
From: "Robert Groh" <rgroh at SWBELL.NET>
To: <HEATH at LISTSERV.TEMPE.GOV>
Sent: Thursday, November 16, 2006 4:12 PM
Subject: Re: SB-301 bfo adjustment


> Thanks, Stu, that is one heck of a nice article. I saved it for future 
> use. Hat's off to the original authors also ( Mark, WB8JKR, and Lenny, 
> WB8JCJ) for their efforts - super job, guys.
>
> 73
> Bob, WA2CKY
>
>
> W6CUX <w6cux at EARTHLINK.NET> wrote: Al,
> Look on pages 7-8 of this document:
> http://members.tripod.com/NRWILLIAMSON/Hw101.pdf
>
> This data is available other places but the one shown was the first one
> I found. The discussion relates to a HW-101 but applies directly to a
> SB-301 BFO.
>
> 73, Stu W6CUX
>
> Schichler, Alfred wrote:
>
>>I know this has been brought up before, but I can't find the information 
>>on
>>changing the BFO frequency to get the same pitch background noise in USB 
>>and
>>LSB on my SB-301. I was going to fix it a while back, but never got around
>>to it.
>>I think there is a mod that tells you how to do that, like installing a
>>trimmer cap or something like that. The pitch is higher on LSB than on 
>>USB,
>>so I think the BFO frequency might be too low (too far from the filter's
>>center freq on LSB, and too close on USB).
>>
>>Any mods or other info on this would be appreciated.
>>
>>Thanks,
>>Al, WA2AS
>>
>>
>>
>
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