[TMC] Sideband Exciters

[John Poulton]

If you want the gritty details of converting and SBE-2 to a -2A, see:

https://tmchistory.org/tmc_drawings/drawings_db/s/s-docs_900-999/s_952.pdf

which details the procedure.  Irritatingly it doesn't say *why* you might
want to make these changes!  The parts list runs for 2 pages, and includes
mods to wafer switch S106, so I think it's more than just power output..

73, John K4OZY


On Sat, Aug 28, 2021 at 3:38 AM Robert Downs via TMC <tmc at mailman.qth.net>
wrote:

> I have many of the TMC manuals.  There are actually two possible reasons
> for the "A" suffix on the SBE-2A.  The first was the addition of an ALDC
> (Automatic Load Drive Control) mod for the SBE-2.  But the slightly later
> one and more likely the reason for the "-A" was a kit of parts to optimize
> operation at about 250 mW PEP output (the SBE-2 was rated at up to 1 W
> output).  The kit consisted mostly of resistors of slightly different
> values from those in a stock SBE-2.
>
> Robert Downs
>
>
> -----Partial Original Message-----
>
> > > ________________________________
> > > From: BERMAN <triodes at optonline.net>
> > > Sent: Friday, August 27, 2021 2:52 PM
> > > To: Meir Ben-Dror WF2U; Nick England
> > > Cc: George W1LSB via TMC
> > > Subject: Re: [TMC] Sideband Exciters
> > >
> > > Meir, thanks for the input on the SBE-series of exciters.
> > >
> > > I have a model SBE-2A (not SBE-2) exciter integrated within my
> GPT-750. Do you (or anyone else here) know how the SBE-2A differs from the
> SBE-2 or the later SBE-3?
> > >
> > > I ask this as I was unaware that the SBE-3 and later variants were
> less of "a pain in the neck" when compared to those units that were of the
> earlier pre-SBE-3 design.
> > >
> > > 73,
> > >
> > > Bruce, W2XR
> > >
>
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