[ARC5] SCR-274N side tone level?

Bill Cromwell wrcromwell at gmail.com
Sat Feb 9 12:03:00 EST 2019


Hi,

Listening to your TX signal is an advantage of using separate tx and RX. 
That's what I prefer. I do have a transceiver (not mil) that came with 
an overpowering CW sidetone. I immediately inserted the resistor Mike 
has mentioned here. I was able to put the resistor in line with the 
sidetone into the audio amp. I made mine adjustable - set and forget. 
Apparently Dave has several choices now. Choose your poison Dave and enjoy.

73,

Bill  KU8H

On 2/9/19 11:49 AM, Michael Hanz wrote:
> 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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-- 
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