[ARC5] SCR-274N side tone level?

Dave Kirk w6mqi at yahoo.com
Sun Feb 10 14:13:59 EST 2019


 Okay guys I need to reset this whole conversation in my original post I mentioned that the CW side tone was too loud along with the phone side tone. My main concern is the CW side tone because I wear headphones while operating CW and the side tone is just ear piercing. So I did some test on the CW side tone, and was able to lower the volume with no problem, but now relay clicking in the headphones is prominent. Funny I didn't hear the relay clacking away in the headphones with the loud side tone:-), fix one problem another appears oh well. Anyway think I'll just let things be have to remember these are WW2 radios not some $10,000 2019 Icom and that's why I like them their quirky, and rough around the edges.
My next issue is to figure why the BC-455-B 40m receiver drifts so much it takes almost an hour for the receiver to settle down my other command set receivers are very stable.

Dave
     On Sunday, February 10, 2019, 5:06:38 AM PST, David Stinson <arc5 at ix.netcom.com> wrote:  
 
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Caution:
If you try putting a pot across the sidetone winding, rather than in series with it,

the impedance change this makes is reflected into the other windings of the 

modulation transformer and will change your modulation envelope.  It changed

mine drastically when I tried this.   In fact, any non-spec load on the sidetone 

winding causes tx modulation envelope effects. It’s been a lot of years now

and I don’t remember the exact details, but ended-up abandoning the sidetone

line altogether in my sets.
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