[AMRadio] SB-10 Modification (was DX-100B on Phone - bad audio distortion / oscillation)

[wb3fau at att.net]

Rick, the DX-100 vfo  is not  very stable.  it  is OK  for AM.  using it on SSB would be a  real  challenge.  I   agree  with others,  use  something newer  on SSB.  Russ.

--- On Thu, 12/8/11, Rick Poole <wa1rkt at arrl.net> wrote:

> From: Rick Poole <wa1rkt at arrl.net>
> Subject: [AMRadio] SB-10 Modification (was DX-100B on Phone - bad audio distortion / oscillation)
> To: amradio at mailman.qth.net
> Date: Thursday, December 8, 2011, 11:34 PM
> 
> Do any of you have a DX-100B that you're running with the
> SB-10 
> sideband adapter?
> 
> This one has the SSB modification, and I have the SB-10 to
> go with 
> it.  There is an additional mod whereby the AM/SSB
> switch was 
> replaced with a 3-position switch, with the third position
> for spotting.
> 
> I'm wondering if the modification is part of my
> self-oscillation 
> problem.  The mod involves running long lengths of
> wire the entire 
> width and depth of the transmitter, terminating at some
> points that 
> could be sensitive, and picking up who-knows-what along the
> way... 
> certainly I can see these long wires picking up RF and
> feeding it to 
> places it doesn't belong.
> 
> If any of you has a DX-100B with this modification I'd be
> interested 
> in knowing how well it has worked out for you.
> 
> Meanwhile I'm considering backing out of the modification
> altogether 
> and seeing where we go from there.  With five rice
> boxes of various 
> vintage, a KWM-2A, and a Marauder, it's not like I don't
> have enough 
> SSB equipment to get me by... don't really need another SSB
> 
> transmitter.  And the old way of spotting with the
> DX-100... pressing 
> the key with the Plate switch off... always seemed to work
> fine with 
> my first DX-100 back in the early '60's (doesn't look like
> this one 
> has the grid block keying mod so using the key for spotting
> should work fine).
> 
> More than one of you has advised backing out of all
> modifications and 
> returning the rig to its original configuration, so that's
> what I 
> think I'll likely do.  Still, would like to know if
> any of you have 
> the DX-100B / SB-10 configuration and how you like it.
> 
> Rick WA1RKT
> 
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