RF in the audio usually sounds like a crackling crunchy sort of distortion 
underneath the audio, not a hum.
So, when you listened to those recordings, does the hum get worse with voice 
peaks on SSB? or is it a constant hum that stays at the same amplitude for 
the entire transmition?
Anyway, I guess we should wait for the antenna to get back up, then you can 
try the stock hand mike with the radio to see if the hum is still there.
If not, and it comes back when you reconnect the heil microphone then you 
know it's the mike and can proceed under that assumption.  If the hum stays 
regardless of which mike you try, then it's either the power supply, radio 
or feed line configuration.
If you've tried a car battery completely on it's own isolated from any 
charger or power supply, and still get the hum, than it's got to be RF 
because you have absolutely no AC anywhere in the system other than that 
which occurs with RF.
Of course, that is assuming you don't have some other component somewhere in 
the system that is using AC power, like an adapter for another piece of 
equipment...IE a speaker, SWR meter, keyer anything like that.

73
Colin, V A6BKX
----- Original Message ----- 
From: "Tom Brennan" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Thursday, April 18, 2013 7:29 PM
Subject: Re: Mike hum


> The power supply I'm using has a three pin plug.
>
> I can't hear the hum on the ts2000 monitor.
>
> I don't get as many reports about the hum using fm and I get fewer reports 
> above
> 6 meters.
>
> I expect to have to replace the filter caps in the power supply in the not 
> too
> distant future but running the rig deirectly from a car battery doesn't 
> solve
> the hum issue.  It is almost reported to me as rf on the signal and 
> recordings
> guys have played me back on air do sound to me like rf rather than mic 
> hum.
>
> Tom
>
>
> Tom Brennan  KD5VIJ, CCC-A/SLP
> web page http://titan.sfasu.edu/~g_brennantg/sonicpage.html