[Yaesu] FT 1000D HUM

Leslie Elliott kc0pto at yahoo.com
Fri Nov 30 19:51:26 EST 2007

Does this have a "built in" power supply?  If so, I apologize.  My Yaesu, a FT-920, uses an external PS, and IU assumed this was the case with the FT-1000D.  My bad.
KCØPTO  Les   

NPAlex at aol.com wrote:  
It is very unlikely that you have a power supply filter problem on your FT 
1000D as if there was a PS filter problem I am sure Yaesu Technicians would have 
spotted that.  
Easy check, is to listen to your radio on another receiver, CW and also SSB 
with the MIC disconnected, set mic gain to zero and RF drive also set low.  Now 
listen to the signal in both modes, I would bet there is no hum.  Also using 
earphones turn the MONITOR gain up and listen for any hum (mic disconnected).  
 I think your problem is probably external to the radio, such as a  bad mic. 
cable, or RF getting into the audio stages, etc.  Again listen to your signal 
into a dummy load, mic connected and gain set normal levels.  Key the unit and 
listen for hum. Then attach to the antenna, and check for hum. IF hum occurs 
with the antenna connected, I would try improving the RF grounds on your 
radio, or check the mic cable shield.
A further test you can do, to isolate the source, is with an "on the air". To 
test for the cause, turn the mic gain down or disconnect the mic.  If the 
listener says the hum disappeared then I think you can be sure it is a mic, or 
mic cable, or unit grounding  problem.  
Norm W4QN
Message: 5
Date: Thu, 29 Nov 2007 07:54:12 -0500
From: "Jesus A Fandino" 
Subject: [Yaesu] FT 1000D
Message-ID: <000b01c83287$451113e0$6500a8c0 at tonyfenja>
Content-Type: text/plain;    charset="us-ascii"

Hi I have a problem for the past 2 yrs with my FT 1000D. Every time I TX
very one tell me my radio has a homing sound behind my voice I have Send it
Yaesus Vertex in California about 4 or 5 times they said is nothing wrong
with the radio. Can any one give me a glue of can be?

Thanks   Tony n4jaf

Message: 6
Date: Thu, 29 Nov 2007 21:35:16 -0800 (PST)
From: Leslie Elliott 
Subject: Re: [Yaesu] FT 1000D
To: Jesus A Fandino , yaesu at contesting.com
Message-ID: <522.99303.qm at web36113.mail.mud.yahoo.com>
Content-Type: text/plain; charset=iso-8859-1

It sounds like it might be your power supply.  One of the filter capacitors 
may have gone bad, causing a ripple on the DC output.  This will cause a hum.   
If you have access to an Oscilloscope, that would be a good way to see if 
this is the problem.  Or, if you can temporarily borrow another known good power 
supply, just try switching to the other supply.
Hope this helps.

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