While operating at multi-multi stations I've run across similar problems.
typically everything works perfectly right before the contest while things
being tested. The rig keys fine until the RF from other bands is added to
mix. One time it was lockup like you've described, except that the lockup
released as soon as the key came up on the other band. Other times I've had
the keying from CT slow down -- yes, slow down -- when the other rig was
being keyed. These problems have generally been cured by keeping the
RF out of the computer with big ferrite clamps around all of the cables. It
hurt, either, to play around with the grounding. Using a separate (but
ground system for the computer can help in single operator situations.
----- Original Message -----
From: "Scott Nichols" <firstname.lastname@example.org>
Sent: Tuesday, February 19, 2002 05:34
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
> 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
> 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
> 73, Scott VE1OP
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