[CQ-Contest] Nagging problem

[Dave Mueller]

I had the identical problem at K1PT, except it was 20m only.  I could
only transmit less than 10W or so without it locking up.  Discovered the
computer wasn't grounded - once it was, the problem completely went
away.

73, Dave N2NL


-----Original Message-----
From: owner-cq-contest at contesting.com
[mailto:owner-cq-contest at contesting.com] On Behalf Of Mike Wetzel
Sent: Tuesday, February 19, 2002 3:50 PM
To: Scott Nichols; cq-contest at contesting.com
Subject: RE: [CQ-Contest] Nagging problem


Scott,

I recently experienced some very similar problems, rf wise.  I've been
fighting my problems for the last 2 months and haven't exactly figured
out
what is wrong.  What I did to fix the problem on CW was to install a
bypass
cap (.001) on the lead from the computer to the keying transistor in the
keying interface.  Now last weekend in the contest that worked for the
first
24 hours then I had to install a second bypass cap from the base of the
keying transistor (in between the resistor and the transistor) that got
me
through to the end of the contest.

Mike W9RE

> -----Original Message-----
> From: owner-cq-contest at contesting.com
> [mailto:owner-cq-contest at contesting.com]On Behalf Of Scott Nichols
> Sent: Tuesday, February 19, 2002 8:34 AM
> To: cq-contest at contesting.com
> Subject: [CQ-Contest] Nagging problem
>
>
>
> I have an equipment problem that is driving me nuts...This reflector
> seemed appropriate as another contestor might have experienced the
same
> thing...
>
> My station, in part, consists of a FT1000MP, interfaced with my
computer
>
> via the serial port (COM1) for rig control, and via LPT1 for the CW
> interface...Have old Heathkit external keyer and Bencher paddles going
> to the second paddle input on the 1000MP...I use CT as my contesting
> software...
>
> My problem...When using CT to send CW, I am limited to VERY low power
or
>
> my 1000mp TX keys and locks on...The only way to unkey the rig is to
> turn the RF OUT knob way down...(I'm talking about 10 or 15 watts on
15
> metres, ugggggg!!)...The only band that seems unaffected is 10 metres,
> where I can crank the amp to full power with no problems...
>
> Simple problem of RF getting into the cabling between the rig and
> computer, right ? That's what I thought too...After replacing all
> cabling with shielded cabling etc etc, the problem is still
> there...Here's the quirk...I can use other programs (LOG-EQF for
> example) to send CW via the keyboard and same computer-to-rig
> interfacing with no problems...Full power on all bands works OK...
>
> In addition, the lock-on problem only happens after I first use CT to
> send CW...Here's a typical scenario that I tested a dozen times last
> night to be sure it wasn't intermittent...
>
> -Turn rig ON with computer OFF...All OK...Can send CW with paddles at
> full power...
> -Turn computer ON without CT running, all OK...Can use full power with
> paddles, and LOG-EQF will send via the keyborad OK at full power...
> -Start CT, use paddles to send CW, all OK...Hit F4 on keyboard to send
> my call, and the TX keys and locks until I turn RF OUT down to minimal
> level...Now, even using the external paddles will lock the TX on...
> -Close CT, paddles still lock TX on...
> -Open LOG-EQF, can now use either the paddles or keyboard to send
CW...
>
> BOTTON LINE...Can't use CT to send CW via the keyboard at any more
than
> 15 watts!! (made for fun last weekend I'll tell you!!...Wife's dream
> almost came true, she thought I was going to turf everything out the
> basement window Saturday afternoon)...
>
> What am I missing here ? I realize that it is an RF problem, but why
> only when running CT ? If it happened when I was using other programs
to
>
> send CW, I could understand...Is there something in CT that I have set
> wrong ? (I do NOT use CT for rig control, therefore no COM port
settings
>
> are used in CT SETUP)...OR...Is there a menu setting in the FT1000MP
> that could be fouling things up ?...The ONLY time this problem arises
is
>
> when I start CT...( No slight against the program, it likely isn't
even
> the program's fault, although I am beginning to wonder)
>
> Again, I have used shielded cabling and tried torroids everywhere etc
> etc etc...
>
> Any help would be GREATLY appreciated...It's baffling me...Sorry for
the
>
> bandwidth...
>
> 73, Scott VE1OP
>
>
> --
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> Administrative requests: cq-contest-REQUEST at contesting.com
>
>


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