SB-104 audio (tx)

Sun Dec 20 16:14:19 EST 1998

Mitch;
If you have an audio oscillator and a 'scope you can run a distortion
test and see where the trouble is occuring. If you want advice just ask.
I am full of it.
 Regards,
 Ed Richards - K6UUZ
Reno, NV

On Sun, 20 Dec 1998 13:32:48 -0500 Mitch Dickson <mitch at VOLSTATE.NET>
writes:
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>Just bought a SB-104.  It has been sitting up a while and needs some =
>attention.  Got the CW working OK.  The audio has some distortion in
>it. =
> The only mic I had was an old Turner +3.  Tried all setting but can
>not =
>get the distortion out.  Sound sorta like RF in the audio.  Tried a =
>shure handheld mic and same result.  Put a 470 pf accross the mic hot
>=
>leads to suppress rf getting in, no difference.  Suspect a flaky cap
>in =
>the audio.  Any SWAGS  (scientific wild ass guess).  Also need a =
>extender board for it.  Got one?  Thanks, Mitch  AE4YW     BTW:  Was =
>going to order a set of caps from digikey for it, but the manual only
>=
>gives the capacitance and not the voltages. Have I got to go through
>the =
>whole unit and look up the working voltages on the caps?  This is my =
>first experience with Heath and so far, I love the radio but their =
>schematics and documentation is below pitiful.  It is amazing that =
>anyone got the kits to work at all.  No voltages, inadequate parts
>lists =
>with no crosses, no such thing as a waveform or a P to P voltage.  It
>=
>appears that they intended for you to send it to their repair center,
>as =
>they seem to have witheld a lot of vital information.
>
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><DIV><FONT color=3D#000000 size=3D2>Just bought a SB-104.  It has
>=
>been sitting=20
>up a while and needs some attention.  Got the CW working
>OK.  =
>The=20
>audio has some distortion in it.  The only mic I had was an old =
>Turner=20
>+3.  Tried all setting but can not get the distortion out. 
>=
>Sound=20
>sorta like RF in the audio.  Tried a shure handheld mic and
>same=20
>result.  Put a 470 pf accross the mic hot leads to suppress rf =
>getting in,=20
>no difference.  Suspect a flaky cap in the audio.  Any =
>SWAGS =20
>(scientific wild ass guess).  Also need a extender board for =
>it.  Got=20
>one?  Thanks, Mitch  AE4YW    
>BTW:  =
>Was=20
>going to order a set of caps from digikey for it, but the manual only
>=
>gives the=20
>capacitance and not the voltages. Have I got to go through the whole =
>unit and=20
>look up the working voltages on the caps?  This is my first =
>experience with=20
>Heath and so far, I love the radio but their schematics and =
>documentation is=20
>below pitiful.  It is amazing that anyone got the kits to work
>at=20
>all.  No voltages, inadequate parts lists with no crosses, no
>such =
>thing as=20
>a waveform or a P to P voltage.  It appears that they intended
>for =
>you to=20
>send it to their repair center, as they seem to have witheld a lot of
>=
>vital=20
>information.</FONT></DIV></BODY></HTML>
>
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