SB401/301 combo on CW

[John Croft Jr]

Hi Stew and Gang-

I don't have a solution but wanted to mention (my ignorance) that I also
have a 401/303 combo acquired recently . . . and thought there was a
"fault" that needed fixing--that blairing sidetone in my headset when
attempting CW--so I'd be interested too . . .

one other "fault" I have is the carrier level in CW seems always 100 Watts
. . . I am unable to reduce by an apprecialbe amount via the mic/carrier
level control (say down to 20 or 30 Watts even) . . . is this normal?

AND my PTT circuit not working therefore I use VOX very carefully set when
in SSB . . . but I'm just procratinating now . . . any suggestions are
greatly appreciated.

73,

John, K3NJ

The Maryland Crofts are
John (K3NJ), Kathy (KB3BPN), John III and Carolyn
http://patriot.net/~croft

On Tue, 3 Nov 1998, Stewart Lyon wrote:

> Hi Gang,
> I have been using my SB401/301 on sideband and find them a very
> satisfactory setup. However, I intend to try my hand on CW during the
> Sweepstakes this year..  I find that the SB401 is a great CW transmitter
> and the SB301 a great CW receiver but together they are not so great. I
> know a lot of you folks use this setup on CW so there must be a better
> way than in the Heathkit manuals.
>
> First, the sidetone setup. The way it is now the speaker line is routed
> through the transmitter where it is switched to a sidetone generator on
> transmit. What happens if you want to use headphones? Joe Lutz found a SB
> on this but he couldn't read it. How do you CW folks do it?
>
> I prefer to monitor my on-the-air signal rather than use a side tone and
> have modified by SB301 to add a "key down gain" scheme.  The problem is
> that the SB401 outputs a signal from the carrier generator board when on
> the air in the TRCV mode and all the time in the TRAN mode. Has anyone
> tried to key the carrier generator crystal along with the mixer and 6CL6
> driver? Wonder if it would chirp or be mushy?
>
> The third complaint I have that maybe someone has solved is the pulling
> of the -301 LMO whenever the -401 is switched to it (as in the LOCKED
> mode)  The frequency changes about 2 KHz. This because of the additional
> load of the tx mixer. It seems to me the -301 should have another buffer
> for the LMO like there is for the BFO. Maybe I'll add one if I can
> remember how to design tube circuits.
>
> Anyway -- any and all comments welcome. (Except about not modifing -- too
> late for that.)
>
> 73, Stu - W6CUX
> Winnetka, CA
> ARRL Life Member
>
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