[Yaesu] Rehabilitating An FT-901DM

[Greg Queen]

Hmmm...

My receiver passes muster with those alignment instructions.  The
interesting thing is that the 12 o'clock position has a detent.  I took the
detent to mean this is the default (standard) position of the control.  With
the puppy in the detent, you don't hear much of anything; the audio sounds
like a narrow bandwitdth situation.

I won't worry about it.  I still have to resolve the ATT switch issue.  If I
can not fix it, I will re-wire around it so that it is always out.  It does
not trip a relay; all it does is insert an attenuation circuit (56-ohm
termination to ground on in and out sides with a 220-ohm resistor in series
between in and out) so it would be easy to bypass.

>From the comments here, I will take it apart (carefully :) and clean all PCB
contacts before proceeding further.

Thanks for the help and encouragement.  The pressure is really on now.  The
license was granted by the FCC today (AE6MF) so the itch is getty stronger.

Greg Queen
GregQueen@cal.berkeley.edu


-----Original Message-----
From: yaesu-admin@mailman.qth.net [mailto:yaesu-admin@mailman.qth.net]On
Behalf Of Stephen Goldberg
Sent: Tuesday, May 06, 2003 16:16
To: GregQueen@cal.berkeley.edu; yaesu@mailman.qth.net
Subject: Re: [Yaesu] Rehabilitating An FT-901DM



Greg-

Service manual instructions:

Tune the receiver to 14.2 MHz in the USB mode and set the WIDTH control to
the 12 o'clock position.  Set the RF GAIN control fully clock-wise.

Change the MODE switch from USB to LSB.  The receiver background noise at
the speaker should not change pitch.  If there is any difference, adjust
VR2301 located adjacent to the mode switch below the chassis until the noise
is of the same pitch when switching between USB and LSB.

Hope this helps.

Steve W4IMF