[TenTec] Old vs New = crunch time

[Ronald Hands]

Dr. Gerald N. Johnson wrote:
> But that relaxation oscillator has one good feature. It starts and stops
> fast, so it doesn't hang behind fast keying. A low pass filter on the
> speaker can help it a lot. I'll have a circuit that I did over 20 years
> ago up on a web page in a while.
>   
It probably achieves the same effect as my MFJ DSP filter (I think it's 
a model 784b), which does a terrific job of smoothing the Corsair II 
side tone and also adds other bells and whistles such as selectivity and 
heterodyne deletion.  I've heard others complain that their outboard DSP 
units introduced a disconcerting amount of delay in the side tone 
signal, but I didn't notice that effect with the MFJ, even when using a 
keyboard.  The MFJ unit also boasts very robust audio.  That I was able 
to buy it secondhand at a very attractive price also added to its charm.

-- Ron
VE3SP