[Yaesu] FM Receive On FT-757GX

[Melum, Mike]

At 06:34 PM 2/15/02 -0800, you wrote:
>    Thanks for the replies to my message, but I don't think I explained
>my situation good enough.
>    I am able to hear the audio, IF I turn my volume knob all of the way
>up.  If it is where it is would be for every other mode (SSB, CW, AM)
>then I can't hear anything even static.  Another Ham that I know that
>has the same radio took a look at it (K=D8OJ) and he said that it should
>have at least static where the knob would usually be.  If I turn the
>knob all the way up then I can hear the stations that are loud enough
>without any problems.
>    Thanks again for the replies.
>    73 de KC=D8LFV (Josh)

Hi Josh,

I had the same symptoms.  For FM only, the FT-757 uses a discriminator IC,
the MC3359 (Q22).  Apparently some of these chips have a weak circuit in
them that tends to fail.  It is the squelch output.  It fails in a mode
resulting in the rig permanently squelched.  I eventually removed the chip
and installed a socket, and put in a new MC3359.  In the interim, you can
take a real sharp pair of dikes and nip pin 15 on the chip.  This will
restore your audio, but you will no longer have squelch control on FM=
 (only).

Removing and installing a new chip is a REAL challenge in the tight space.
If you can live without squelch, this might be your solution.

GL


Tnx & 73

Mike, KL6M  BP51dc    Webpage:  http://www.qsl.net/kl6m
432 EME - FT-736; FT-767; 9.2 Meter Dish; DEM 0.4dB; 700 WATTS