[CW] EASY QRS WITH LIGHTNING BUG, CHAMPION OR J-36 BUGS

[Richard Knoppow via CW]

    Either will work. The rod is a pendulum who's resonance 
is determined by the moment of inertia of the mass and the 
stiffness spring. The moment is increased by increasing 
either length or mass. The problem is that additional 
weights change the feel because more energy must be used to 
start it going. Reducing the stiffness of the spring would 
work better but the only bugs that allowed that were some 
Vibroplex deluxe keys using the LaHiff adjustable spring. I 
don't know how well this worked.
    I have a Bunnell J-36 that is very fast, apparently 
typical of the type. I used a kind of clamp weight made for 
setting length on a carpenter's triangle. I am drawing a 
blank on the name of the part and the correct name for the 
triangle. These fit on the flat pendulum bar but I think 
will fit onto round bars also. This key runs at around 30WPM 
minimum.


--
Richard Knoppow
Los Angeles
WB6KBL
dickburk at ix.netcom.com
----- Original Message ----- 
From: "K4OAH via CW" <cw at mailman.qth.net>
To: "Danny Douglas" <n7dc at comcast.net>; "CW Reflector" 
<cw at mailman.qth.net>
Sent: Friday, December 19, 2014 10:32 AM
Subject: Re: [CW] EASY QRS WITH LIGHTNING BUG, CHAMPION OR 
J-36 BUGS


Danny -

You need to extend the rod to slow it down.  Stacking 
weights UP the rod just damps the vibration.

An alligator clip on the end out past the bumper with some 
solder wrapped around it will allow you to slow it 
significantly.

73, Garey - K4OAH
St. Charles, IL




> On Dec 19, 2014, at 12:09 PM, Danny Douglas via CW 
> <cw at mailman.qth.net> wrote:
>
> Hmmmm never thought to do that.  I just attempt to slow it 
> down by putting on more of the round weights, but of 
> course it has never worked well, with them being strung 
> out along the round (not flat like your picture) swinging 
> rod.    Mine is SN 175333 issued to me as a government 
> (state) operator back in the late 60s (Broadway address), 
> and was probably the last one used with the last state 
> dept cw circuit, which I closed down around 1970.  Or so I 
> was told, at the time.   I still use it, as a secondary 
> key on my backup hf rig (IC706markII).  Dits are just too 
> fast for most ops today.
> Thanks
> Danny Douglas
> n7dc at arrl.net
>
> Benny Owens via CW wrote:
>>
>>
>> 73 AND MERRY CHRISTMAS
>
> -- 
> Danny Douglas
>



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