SB-610 Monitor Scope - Tone Out

[Stu Lyon]

Carl,
I think the issue is too LOW a signal to show up on the Tek scope rather 
than too high. The TONE signal is suppose to simulate a microphone which 
is down in the low millivolt range. I'm not sure what the typical mic 
output of -55db equates to in volts but it's pretty low. 

The topic comes up in the list frequently where the question of  'no 
TONE"  is really just a matter of failing the recognize the low voltage 
level of the two tones. The two tone frequencys are 1500Hz and 1950Hz.  
(Not 1590)

Ref:  http://bama.edebris.com/manuals/heath/sb610/  sb610.djvu  look at 
the schematic around V4.

73, Stu W6CUX

carl lowry wrote:
> Have a new Tektronix model 2235 Scope which i'm attempting
> to check the TONE OUT function on my Heathkit SB-610.
> The scope is suposed to output 1500 & 1590 tones.
> Question before i hook it up.
> Can i run a direct cable from the TONE RCA Jack on the scope to the input 
> Channel of the Tektronix without going thru a Probe ?
> Does the SB-610 probably have too much voltage to run directly ?
> What are you all doing ?
> I've run my HP 8640 Signal Generator thru a Probe & that works fine but not directly into the Tekronix 
> Suggestions please ?
> Thanks
> 73s
> Carl, k4zrd
>
>   

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