[ICOM] IC-746Pro Audio/Receiver Cut Out Issue

[Kelly Taylor]

Seems the T/R relay is a better culprit to check: doubtful a bad speaker connection would cause signal loss, as described the the OP.

73, kelly, ve4xt,

> On Nov 16, 2016, at 8:29 AM, Bill <bmarx at bellsouth.net> wrote:
> 
> I had a similar problem and it turned out to be a bad connector to the external speaker. Are you using the internal or and external speaker?
> Bill
> 
> On 11/15/2016 10:15 PM, Mark K3MSB wrote:
>> Hello All
>> 
>> Our club's 746Pro is having an issue.   The following was written by one of
>> our members:
>> 
>> "I had problems with the Icom-746PRO again this past weekend during the WAE
>> RTTY contest.   The radio and station worked flawlessly for a couple of
>> hours and then the audio suddenly started dropping out (as described at the
>> last meeting).
>> 
>> I checked all radio settings and disabled anything (i.e. NB, squelch, etc)
>> that could potentially cause the receive to cut/drop out.   Nothing made a
>> difference.
>> 
>> I made a couple of video recordings which I posted on the club's  website
>> <http://www.qsl.net/w3zgd/>.  Click on the "Links" tab (bottom of the left
>> panel) and scroll to the bottom of the page.  There are two recordings, 9Mb
>> and 14Mb, which will likely take a couple minutes to download to your
>> computer.   You probably only need to download one of the files to get a
>> idea of what is going on.
>> 
>> Both videos begin with no sound after the radio cut out while monitoring a
>> S9+ signal from Europe.   In each recording, I pressed the PTT
>> button on/off to switch the radio from RX to TX and back which seems to
>> consistently bring the receive back -- sometimes for a few seconds (as in
>> these recordings) and other times for a few minutes.   While the audio
>> level in the video is not great, you can see the strong signal strength on
>> the meter which lasts for a couple of seconds and then fades out.    The
>> fade out is not from the station stopping their transmission -- it's simply
>> the radio receive fading to zero on its own."
>> 
>> Comments welcome
>> 
>> 73 Mark K3MSB
>> ----
>> Your Moderator: Dick Flanagan K7VC: icom-owner at mailman.qth.net
>> Icom Users Net: Sundays, 1700Z, 14.316 MHz
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>> 
> 
> ----
> Your Moderator: Dick Flanagan K7VC: icom-owner at mailman.qth.net
> Icom Users Net: Sundays, 1700Z, 14.316 MHz
> Icom FAQ: http://www.qsl.net/icom/
> To support QSL/QTH.net: http://www.qsl.net/donate.html