[TenTec] Passband

[Keith Hamilton]

I hear the default 700 Hz tone thru the 500hz filter with the band pass control centered. When I switch to the 250 Hz filter the tone remains 700 Hz  The signal strength goes to almost 0. To bring the signal strength back, I must tune up the band raising the tone heard at the same time to an unacceptably high level  This should not happen if the passband of the two filters is the same. 

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On Jul 5, 2011, at 7:02 PM, "John" <jlockj at earthlink.net> wrote:

> Keith,
>  
> Can you use the band pass tuning to allow the tone you want to hear through the filters?
>  
> With the control centered, the tone you're listening to must be about 750 Hz.
>  
> John W0DC
> ----- Original Message -----
> From: Keith Hamilton
> To: Discussion of Ten-Tec Equipment
> Sent: Tuesday, July 05, 2011 5:51 PM
> Subject: Re: [TenTec] Correction
> 
> I am a piano tuner by profession. My tonal impression could never be as much as 200hertz off. The filter is 200 hz off.
> 
> 
> On Jul 5, 2011, at 6:33 PM, Carl Moreschi wrote:
> 
> > The real question is is the filter 200 hertz off or is your impression 
> > of the same tone 200 hertz off.  Only the 250 filter would be narrow 
> > enough for this to show up.
> > 
> > You need a second radio to see if the filter is off.  Tune in the same 
> > signal on both radios.  Center the signal in the 250 filter and then 
> > transmit at very low power and see if your signal matches the receive 
> > test signal in pitch.
> > 
> > Carl Moreschi N4PY
> > 121 Little Bell Dr.
> > Hays, NC 28635
> > www.n4py.com
> > 
> > On 7/5/2011 6:28 PM, Keith Hamilton wrote:
> >> I made a typo in my question. I meant to say I must tune the radio from 7.040.00 to 7.040.20 to center the 250 hz filter.
> >> Sorry
> >> Keith W8GX
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> 
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