[ICOM] IC-746PRO sensitivity and noise problems

[Clif Holland]

Turn off all the computers in the house and see what happens.

Clif Holland, KA5IPF
www.avvid.com


----- Original Message ----- 
From: "Gregory W, Moore" <gwmoore at moorefelines.com>
To: "ICOM Reflector" <icom at mailman.qth.net>
Sent: Tuesday, June 29, 2004 7:34 AM
Subject: [ICOM] IC-746PRO sensitivity and noise problems


> GM to all in the group
>
> I presently have an Icom IC 746PRO which I purchased back in 2002.
> Since I am a MARS op, it has the requisite mods required for such
operation.
>
> Now, I am experiencing whiat I believe to be both a lack of sensitivity,
> as well as a 60Hz harmonic on recieve all the way up thru 3500Hz.   This
> interference, of course, is much more noticible in AM mode, which I am
> using for troubleshooting purposes, as if I can get rid of the
> hum/interference whth AM mode selected, the performance on SSB will have
> taqken care of itself.
>
> I had believed for a short time that the problem was due to an air
> conditioner, but I have since discovered that it is not eminating from
> this household.   Yhere also appears to be a general lack of
> gain and sensidtivity which have gradually increased over time.
>
> I have some wav files of the interference, as well as a  screen capture
> of the waterfall display on MixW qwich will show the interference, and
> to save transmission bandwitth, if anyone would like to hear/see the
> problem I will post them on my website so they can be downloaded,
> instead of tying up time on downloading large attachments via email.
>
> If anyone has any ideas as to where I should be looking, I would be
> appreciative of suggestions.
> I want to get this fixed before I put my longwires up, for there is no
> point in putting up a better,, broadband, antenna up with the noise
> problem  in existance.
>
> I am running the 746PRO thru aqn MFJ -969 Versa-Tuner into a Gap Titan
> Dx vertical.  I know that this is not the optimum, setup for MARS ops,
> but I am still in the process of obtaining and erecting the requisite
> towers to create the endpoints for the dipoles, as well as squeezing
> everying in my lot size.
>
> Again, any oideas will be appreciated
>
> 73 es tnx de Greg WA3IVX/NNN0BVN
>
>
> -- 
>
> Happily turning electricity into RF energy for almost 40 years,
> on land, sea and air, professional and amateur,
> around the clock and around the world. KEEP CW ALIVE!
> Become an Elmer today!!!
>
> "All that is necessary for the triumph of evil is that good men do
nothing."
>                                                    --Edmund Burke
>
> Greg Moore NNN0BVN PA
> U.S. Navy-Marine Corps Military Affiliate Radio System (MARS)
> Official Pennsylvania Area Website:
> http://pages.prodigy.net/nnn0fbk/mars.htm
> Official Northeast Area Website:
> http://www.navymars.org/northeast/index.htm
> Navy-Marine Corps MARS: Proudly Serving Those Who Serve."
> E-Mail (MARS) nnn0bvn at navymars.org
> E-Mail (ARRL) wa3ivx at arrl.net
>
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>
>
>
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