[CW] GHD GH-GF501A

[stan levandowski]

I think I can rule out the circuitries which are KX1 and KX2.  It 
happens on neither rig with another bug.  Seems to just happen with my 
favorite bug, wouldn't you know... The contacts "look" VG but how would 
I really know just by sight.  I usually use a piece of cardstock.  I'll 
try the alcohol and keep working on it.  I once had an electronic "bug 
de-scratcher" I built from Jackson Harbor Press kit.  It worked but I 
didn't like the "feel".  The delay was apparent at least to me. Thanks 
for the advice.  73, Stan

On Sat, Feb 25, 2017 at 04:53 PM, Joe wrote:


Hi, Stan.

I worked on minimizing that scratchy last few, or on any dits. 
       It appears to be caused by various 'things'

Probably the two most effecting things are contact surfaces, ie.
       smoothness and the keyed circuit.  If the two mating surfaces are
       not mirror smooth,

       the contacts will, you might say, bump along when the pressure is
       reduced.  The "U" spring's tension goes down as each dit is made
       to the steady

       state of either on or off..  If the two contact surfaces are
       mirrored finished, at the lower tensions, the bumping will be
       barely noticed.

The other is the circuit being keyed.  Where is the thresh hold
       for on and off at?  Is it a wide range or a narrow range?  If it
       is a wide range, you may

       have what appears to be scratchy sounding keying at the keying
       goes on & off over that transition range, not a clear on or
       off state.

As I get ready to use my Junior, I take a piece of paper wet with
       either alcohol or naphtha and draw it through the closed
       contacts.  No dirty ink

       laden dollar bill.





On 2/25/2017 3:09 PM, stan levandowski
       wrote:





Funny you should mention the 8
         dit thing...I was messing around this morning with my 70s era
         Vibroplex presentation and yes, after about 8 to 10 GOOD dits,
         it got sloppy.  Wish I'd seen your email comment earlier. 
 Would
         have saved me a lot of frustration this a.m. trying to "fix" 
the
         "problem."  I was trying to get it to go from the last good dit
         to steady state without first going through a couple of fuzzy,
         bad dits.  I even stuffed differing amounst of foam in the U
         spring thinking that might be part of the problem with the
         scratchy dits, I've tried a 1 uf cap  I have a "dot stabilizer"
         also but that doesn't work either.  The contacts are like new.
          It must be something mechanical I don't understand that occurs
         near the end of the dit string.  Probably not solvable.  Not
         really an operating issue; just something that bothers me that 
I
         wish I could fix.  






73, Stan WB2LQF




     --
Regards, Joe, K8JP/V31JP, Ronnie, Marty & Sidney Pontek
2129 CR 1229
Pittsburg, TX 75686
U.S.A.
or
P.O. Box 280, Dangriga, Stann Creek District
(Hopkins Village) Belize

903-204-2318 (My TX cellular)
903-884-5990 (Skype telephone number, Belize & TX)
Also, K8JP, member FOC-1743, QCWA-LM21894, OOTC-4607, A1OP, SKCC-3171T, 
NAQCC-5798, Flying Pig-2819, FISTS-7625CC951, A1C-2299, SOC 1075, 10-10 
22977, PG1915841, CW Rag chewers #21,
Skype: v31joepalooka
Facebook: Joe Pontek
I am looking for Vibroplex Model X, Double lever and prefer basket cases 
to restore.
LotW
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