[ARC5] SCR-274N side tone level?

[Michael Hanz]

Table 8 in the manual says the sidetone voltage on CW is 7-9 volts into 
4,000 ohms.  Are you using low impedance earphones?  If you are, you 
might try an MC-385* headset adapter to lower the volume. Or, you might 
check to see if you have a low impedance tap on the sidetone 
transformer, T-50, in your modulator.  Here's the note on the tap:



Or, you could just put an appropriate resistor in series with the jack 
to your headphones...:-)

  - Mike  KC4TOS

On 2/9/2019 10:52 AM, Dave Kirk via ARC5 wrote:
> I run a stock SCR-274N setup with a BC-456 modulator not sure if this 
> is normal, but the side tone in CW, and phone is ear piercing I can't 
> even wear my headphones its so loud. Is there a simple way to lower 
> the level? So far I haven't seen in the manual any mention of level 
> adjustment. Guess I understand why its loud the radio dude needed to 
> be able to hear the radio during flight, but dang this is ridiculous.
>
> Dave

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