[MFJ-Ameritron] MFJ-945E problem

Wed, 26 Jun 2002 06:22:19 -0400

Lu:

I'm not familiar with the 945E, but I do have a 941D antenna tuner.  I =
had a similar problem with it.  The inductor selector, a 12-pole, =
single-throw switch, had a cracked wafer, and the contacts weren't =
touching on some bands, making the thing look like an open circuit to =
the radio.  It was real hard to see that the wafer was cracked and =
warped.  If your radio has automatic SWR protection, that would explain =
it not transmitting, and that would also explain no signals on receive.  =
Check that switch. =20

I replaced mine with a 12-pole, dual-throw wafer switch All Electronics. =
 Since it was dual-ganged, I soldered each pair of contacts together to =
make it last longer before the contacts got dirty or wore out.  Haven't =
had a problem since.

- Fred M.  KA1DGL

----------
From: 	Lu[SMTP:[email protected]]
Sent: 	Wednesday, June 26, 2002 2:13 AM
To: 	[email protected]
Subject: 	[MFJ-Ameritron] MFJ-945E problem

When I put this HF/6m tuner inline, I can't hear anything on 10m during =
a
band opening and the meter shows no output on TX.  When I remove it from =
the
system, my receive comes back and the radio transmits fine.  I've =
eliminated
coax switches and coax jumpers as potential problem sources.  It started =
as
an intermittent problem when it was in the car, but now in the shack it =
has
stayed faulty, and turning it or shaking it does not bring back correct
operation like it once did (in the car I had to run it upside down to =
get it
to work right but now even that doesn't help).  I've never run more than
100W through it.  I re-flowed the solder joints on the two SO-239 =
centers,
but it didn't help.  Visual inspection did not bring out any obvious
problems...could it be a cracked PCB trace?  Is this a problem common to
this model?  Tnx for any help.

Lu

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