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

[John Lyles]

Rick, by all means remove that modification. The DX100 was a poor way to get on SSB, the VFO was - no way - stable enough. Even the Apache was a marginal performer
with the SB10, that was my first SSB transmitter in the early 1970s. In addition, it moves the RF drive signal out through cables to the rear, then returns it  to the PA. 
The switch then bridges the connection when back in AM or CW modes. Be sure that the amplifier is also biased for class C when you are done, not AB. 
Let us know how it plays once its back to stock. 
John 
K5PRO

WA1RKT sez:
> 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.

> 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.