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Author Topic: Yaesu FTM-400DR/DE Attenuating Receive Signals  (Read 1931 times)
K5AJ
Member

Posts: 14




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« on: March 16, 2017, 09:02:34 AM »

Hi,
After over a year of flawless use of the Yaesu 400, incoming signals
are being attenuated way down.
 
Distant repeater - other stations hear me 5 by 9, I cannot hear them, only squelch sound while they transmit, sometimes unreadable feint voice.
Near Repeater - other stations hear me 5 by 9, Their signal via repeater, to me, is feint but readable with squelch static mixed with their signal.
Another near repeater - same as above.

Troubleshooting attempts:

Tone setting is correct for repeaters.
Can contact them using different radio.
Trying all modes - receive still attenuated.
Antenna Analysis 1.4 SWR.
Tried all Yaesu 400 Squelch settings - problem still persists.
Yaesu manual - no help, unless solution is well hidden.
Website searching - nil

There must be something, otherwise obvious, that I screwed up
and I'll very much appreciate any enlightenment.

Many thanks,
Jack


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NC5P
Member

Posts: 29




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« Reply #1 on: March 16, 2017, 01:28:19 PM »

Are both receivers inside doing this?  I would check the T/R relay.
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K5AJ
Member

Posts: 14




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« Reply #2 on: March 16, 2017, 02:20:47 PM »

Hi NC5P,
Thanks for replying.

Are both receivers inside doing this?  I would check the T/R relay.
The attenuation is same on both.
As far as I can tell T/R relay is working as it should
it will complete trans upon releasing mic button, and
will receive, although attenuated. 

Thanks,
Jack
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K5AJ
Member

Posts: 14




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« Reply #3 on: March 16, 2017, 04:17:40 PM »

A local ham suggested I update the firmware, unfortunately it will not update.
Cable driver installed
Correct cable
FTM-400XD_ver220(USA).exe
Internal selector switch used according to youtube video
Power cable reconnected
Yaesu cable connected
Software used, then...
Error: The firmware did not update (H'00,H'A0')


I have no idea what error (H'00,H'A0') is, so I sent email to
Yaesu. So, i have to continue troubleshooting the attenuation
problem, with the oldest version of the FTM400 firmware.

Regards,
Jack
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NC5P
Member

Posts: 29




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« Reply #4 on: March 17, 2017, 09:57:48 AM »

There are actually two T/R relays, RL1501 and RL1503.  There is a diplex filter that joins the two relays to the antenna.  That arrangement allows you to transmit on one band and receive on the other (for full duplex or to use the repeater function).  Is this happening on both 2m and 70cm or just one band? 

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KF4HR
Member

Posts: 25




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« Reply #5 on: April 11, 2017, 05:48:00 AM »

Are you using an external speaker?  And if so, did you use the included 3.5mm speaker adapter?  Funny as this may sound, the adapter is necessary or at least one of your receivers will be attenuated. 
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