[AMRadio] The Ranger Keying Problem


Rob Atkinson ranchorobbo at gmail.com
Tue Dec 31 12:19:27 EST 2013


Right the VFO is free running.  It did not occur to me to point that out, sorry.

73

Rob
K5UJ

On Tue, Dec 31, 2013 at 11:02 AM,  <w8au at sssnet.com> wrote:
> Keep in mind that adding delay (choke) to a cathode keyed line may induce
> chirp in a rig that also keys
> the vfo cathode. Crystal control alleviates this for the most part, but to
> really get away from chirp is run the osc continually and key to
> buffer/final cathodes, which eliminates QSK.    There's a trade-off no
> matter which way you go.
>
> Perry    w8au
>
> At 11:45 AM 12/31/2013, Rob Atkinson wrote:
>>
>> You can fix up the click problem with a cathode keyed rig by
>> experimenting with combinations of chokes, low value resistor and
>> capacitor.  choke in series on the key line; resistor in series or
>> bypass, cap bypass.  run the rig into a dummy load and look at the
>> keying envelope with a scope sending a string of dits.  I found that
>> around 4 to 5 mfd bypass cap to ground on the cathode gave a nice
>> shape.  The make and break originally was vertical and the cap
>> introduced enough angle to the rise and fall to get rid of the clicks
>> and make a nice sounding note.
>>
>> Some clicks are in the shack only.  Those are produced with arcs at
>> the key.  Choke or resistor at the key help with that.  The clicks
>> that go out on the antenna have to be fixed at the rig's keyed
>> cathode--same passive components but inside the rig.
>>
>> 73
>>
>> Rob
>> K5UJ
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>
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