[Amps] Emtron DX3 problem

[HAROLD B MANDEL]

Sirs,

The DX-3 in my hotel room that I also tried out at a number of cell sites
last year made a bunch of line noise in standby too. My Commander 2500E
makes
electrical noise and so does my '77Sx clone.

The fix was to purchase RF beads from a 'Web vendor and to wrap them on
all
the leads in the station, meaning a.c., data, speaker, D.C. power and
control.

Coax line chokes were also inserted into the lines to and from the
exciter
and amplifiers, but that was for RF feedback, only in transmit.

The beads did the trick.

Hal
W4HBM




On Fri, 30 Sep 2005 08:47:16 -0700 gdaught6 at stanford.edu writes:
> Hi,
> 
> >         Here is a good one for you.  Kirby reports that his new 
> Emtron
> >         DX3
> > (single GU87B)  wipes out his DSL modem.  He says that the DSL 
> modem
> > goes off line each, and every, time that the DX3 is turned "on" 
> and
> > comes back on line when the amp is turned off.  The amp is simply
> > turned "ON", idling, no drive applied.
> > 
> >          My initial thought  is that a spurious signal is being
> >          generated in
> > one of the  regulator circuits (bias, or screen), or perhaps, the 
> bias
> > switching (cut off) circuit.  What do you think? . 73 de K5JV
> 
> Curious.  I would suspect the "soft-start" circuit in the Emtron as 
> 
> the culprit.  It's the first place I would look, anyhow.  It's a 
> triac switching gizmo hooked up directly to the mains power line.  A 
> 
> way to test my hypothesis is to remove (temporarily) Emtron's 
> circuit 
> and substitute an old fashioned resistor switching step start.  If 
> the problem goes away, the hypothesis was correct, and a solution 
> has 
> been found.  If the problem doesn't go away, then... ?
> 
> 73,
> 
> George T. Daughters, K6GT
> 
> 
> 
> 
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> 
> 


Harold Mandel
Const. Supt.
Baran/Greenville
606 - 205 - 0172
hmandel at barantelecom.com