[Hammarlund] SP-600 BFO waveform

[Al Parker]

Hi Smith,
    I've got an SP-600 on the bench right now, I'll get the scope on the BFO 
& see what I find.  Will try to get a pic & let you know some info.  --  
tomorrow sometime probably.
    I do (vaguely) remember being inside the BFO can on one, some yrs ago, I 
think I did change a mica, don't remember which one, or which rcvr, so don't 
know where to look in my shop notes.
73,
Al, W8UT
New Bern, NC
www.boatanchors.org
www.hammarlund.info

----- Original Message ----- 
From: "stbradford" <stbradford at insightbb.com>
To: <hammarlund at mailman.qth.net>
Sent: Saturday, February 16, 2008 5:20 PM
Subject: [Hammarlund] SP-600 BFO waveform


> Hello list,
>
> I have observed a very distorted wave form from the bfo oscillator. With
> the buffer removed and the scope looking a the input from the g1 pin.
> It's also the same wave form at the physical output of the 6C4 bfo
> oscillator.
>
> All volts and resistances are reasonable so I have removed the bfo sub
> assembly from the receiver. The various silver micas are on the way,
> they were all available from Mouser. The schematic has the same values
> that I found in the sub assembly. I will check the caps on the capacitor
> bridge and see what it shows. But considering the difficulty in removing
> the assembly I am going to replace all 5 of the caps.
>
> Smith Bradford
> W9HAK
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