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[wxsig] Radio Interference Question

John Bennett jabennett at insightbb.com
Thu May 17 01:04:29 UTC 2007

Be sure you are not over-deviating. If severe enough, it will cause the
problem you described.

GL es 73,

John, N4XI

On Wed, 2007-05-16 at 20:47 -0400, Leon Bruner wrote:
> John,,
> Tonight I sat down with a glass of my favorite and a handleld radio and 
> kept an eye on the unit for a reasonable period of time.  I have 
> verified that the red PTT LED goes on approx every 5 minutes and it keys 
> the transmitter.  The signal from the keyed transmitter is received on 
> the handheld.  However, there does not appear to be any audio output 
> associated with the transmission.  Said another way, the radio is keyed, 
> a signal is transmitted but there appears to be no information going 
> out.  The transmission is very short- only a second or so...  So it 
> appears that I have an audio problem...  I'll have a look through the 
> manuals tonight to see if I can identify a solution.  In the meantime, I 
> thank you for the help and hope you're having a great time in Dayton.
> Leon
> John Koster wrote:
> >I don't see any choices for TX frequency.  So I guess we're stuck with 5 
> >minutes.  Need a clever way to 'capture' the event.  
> >
> >At this time we really don't know whether its' a PTT problem or an audio 
> >problem.  If you have a receiver and audio recorder perhaps you could 
> >record the audio on the frequency over a period of time and see what you 
> >might hear.  I assume you've checked the radio with  microphone to be sure 
> >it's not developed a problem over the years.  You'd want the monitoring 
> >receiver to have a poor or no antenna so you don't pick up other signals.
> >
> >I am a little puzzled by the low voltage reading.  If I didn't read the 
> >schematic wrong the reading is from collector to ground of the PTT 
> >transistor.  It should be 5 unless you have a real low impedance 
> >voltmeter.  Of course that also depends on you having a solid +5 VDC rail.
> >
> >I'm leaving in the morning for Hamvention, so I'll probably not be reading 
> >my email very frequently.
> >
> >On Tue, 15 May 2007, Leon Bruner wrote:
> >
> >  
> >
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John Bennett
Evansville, IN
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