[ICOM] 751A Transmit

[Paul Gates, KD3JF]

You are right Jerry.

Larry Winslow <larry_w at comcast.net> wrote: Your age is showing as is mine!!!
Larry

At 10:34 AM 7/24/2007, you wrote:

>Larry, I thought I was the only one who knew 
>that trick with a dollar bill! 
>
>Paul, KD3JF
>
>Larry Winslow  wrote: A tip from the days of relays...
>
>Use a dollar bill to clean the contacts. It is
>just slightly abrasive & will do a good job of cleaning.
>
>73 - Larry WØNFU
>larry_w at comcast.net
>
>At 06:21 AM 7/24/2007, you wrote:
>
> >"with a very light sand paper "
> >
> >WOW, seems VERY harsh.  How about just pencil eraser (and not the ink kind).
> >We had to do that "in the old days"(1968) on some of the equipment that
> >customers had placed in factory environments etc. (humid, DIRTY, corrosives
> >in the air).
> >
> >73, Jim
> >
> >----- Original Message -----
> >From: "GGLL"
> >To: "ICOM Reflector"
> >Sent: Tuesday, July 24, 2007 7:55 AM
> >Subject: Re: [ICOM] 751A Transmit
> >
> >
> >Perhaps a general readjustment of screws is in order (for boards,
> >specially RF and power amplifier). Unscrew them a little then re-tight.
> >In extreme cases, someone add star washers also.
> >For the connectors, unplug and sand the pins (exposed ones) with a very
> >light sand paper then plug and unplug a couple of times the connector.
> >Check antenna connector tightness also.
> >
> >Best regards
> >Guillermo - LU8EYW.
> >
> >EP Swynar escribió:
> > > Good Day All,
> > >
> > > My venerable 751A put up some very strange behaviour yesterday, after
> >having sat idle for some 3 months...I wonder if anyone reading this might
> >have a suggestion, or two, before I open the rig up later this afternoon?
> >Any & all feedback / comments are not only welcomed, they're hereby being
> >solicited! Hi Hi
> > >
> > > Specifically, I fired up the rig to transmit on 40-meters and the power
> >output meter showed nearly 150-watts! I reduced the drive control COMPLETELY
> >counterclockwise, & it STILL put out the same power...
> > >
> > > The carrier would stay continuously "on", too, dropping off ONLY when the
> >VOX did.
> > >
> > > This strange condition was evident on both a dummy load, as well as a
> >resonant antenna. All "peripherals" were removed, the grounding was
> >checked --- status unchanged. I tried it on different bands, but the only
> >difference was the power output, which varied from 100- to 150-watts
> >(dependent upon the band).
> > >
> > > Finally, I tried 10-meters & the output suddenly dropped right off to
> >zero --- I'm sure I popped the internal fuse with that last test.
> > >
> > > It would appear that the finals in the rig are somehow "taking off" /
> >self-oscillating, for some reason. I have not touched the rig in any way,
> >shape, or form, since QRN took over 160-meters here last April.
> > >
> > > I wonder if, by sitting idle like that, one 
> of the interior connectors has
> >somehow oxidized / deteriorated in the humidity of summer...?
> > >
> > > In any event, I have to get inside to replace the fuse anyway, so I'll
> >check those out...but I am curious if anyone else has ever had any similar
> >such occurance with their 751A...
> > >
> > > Thanks in advance, & vy
> > >
> > > ~73~ Eddy VE3CUI - VE3XZ
> > > ----
> > > Your Moderator: Dick Flanagan K7VC, icom-owner at mailman.qth.net
> > > Icom Users Net: Sundays, 1700Z, 14.316 MHz
> > > Icom FAQ: http://www.qsl.net/icom/
> > >
> >----
> >Your Moderator: Dick Flanagan K7VC, icom-owner at mailman.qth.net
> >Icom Users Net: Sundays, 1700Z, 14.316 MHz
> >Icom FAQ: http://www.qsl.net/icom/
> >
> >----
> >Your Moderator: Dick Flanagan K7VC, icom-owner at mailman.qth.net
> >Icom Users Net: Sundays, 1700Z, 14.316 MHz
> >Icom FAQ: http://www.qsl.net/icom/
>
>----
>Your Moderator: Dick Flanagan K7VC, icom-owner at mailman.qth.net
>Icom Users Net: Sundays, 1700Z, 14.316 MHz
>Icom FAQ: http://www.qsl.net/icom/
>
>----
>Your Moderator: Dick Flanagan K7VC, icom-owner at mailman.qth.net
>Icom Users Net: Sundays, 1700Z, 14.316 MHz
>Icom FAQ: http://www.qsl.net/icom/

----
Your Moderator: Dick Flanagan K7VC, icom-owner at mailman.qth.net
Icom Users Net: Sundays, 1700Z, 14.316 MHz
Icom FAQ: http://www.qsl.net/icom/