[ARC5] My ARC-5 40 meter station

[Charles]

-----Original Message----- 
From: Kenneth G. Gordon
Sent: Saturday, February 21, 2015 8:46 PM
To: Charles
Cc: ARC-5 List
Subject: Re: [ARC5] My ARC-5 40 meter station

On 21 Feb 2015 at 17:56, Charles wrote:

> I am acquainted with the design specs. 15 watts is with new 1625´s and 
> with
> the 600 volt B+, and I only had 560V and a pair of well used tubes... I 
> also
> don´t believe that 15 watts of carrier is at 100% modulation.

Speaking of which, that scope photo you have on your site looked absolutely
excellent to me.

I assume that is a photo of your plate modulated output with a sine-wave
driving the modulator? If so, I detect a very, very minor amount of 
distortion.

If that is what you're getting, I wouldn't touch a thing.

Ken W7EKB

---------------------------------------------
Yes, that is the *screen-modulated* output of the ARC-5, with a very clean 
General Radio oscillator driving the mic input.
The pic was actually taken before I redesigned the modulator output stage, 
so it now looks even better and at any audio frequency,.
Not sure of the % distortion but (other than some trace hum from the power 
supply) it gets very good audio reports on the air.

-Charles
WB3JOK/0