[TenTec] MY_ORION&O2_RF_IN_MIC-PROBLEM_SOLVED!!

[Ron Castro]

That is all valuable information.  I want to add that my Orion II had a 
problem with RF, but it was coming in via the headphone wire and the CW 
paddles connected to the back.  Ferrites solved the problem--now no RFI at 
full legal power, all bands, all antenna orientations.

Chopping coiled up cables is a good idea, but I ran into a problem recently 
when I reduced the length of my mic cable, which goes through Heil "Topless" 
boom to a  W2IHY 8-Band EQ.  I suddenly had RFI on 10 meters where I had 
none before.  It turns out that the I chopped what was a 20' mic cable to a 
length of 8', a nice quarter wave on 10, which worked much like an 8' 
vertical on the bumper of a car.  A ferrite loop fixed that too.

Ron
N6AHA

----- Original Message ----- 
From: "Lynn Lamb" <w4nl at charter.net>
To: "Discussion of Ten-Tec Equipment" <tentec at contesting.com>
Sent: Wednesday, March 01, 2006 5:16 AM
Subject: Re: [TenTec] MY_ORION&O2_RF_IN_MIC-PROBLEM_SOLVED!!


> George, This is a great lesson and thanks.
>
> I've found on some bands more than others the proximity of the antenna to
> the shack was a factor relative to this kind of problem, i.e if the beam 
> is
> over the roof and not away from the house.  This is common sense I guess,
> but it complicates the situation.  And when someone says there is only one
> or two ways to solve the bonding challenge (grounding) I don't believe it.
> There are many ways, length of braid, etc etc.
>
> But in the end, I believe if we keep it simple.. no extra coax rolled up
> behind the table/desk, as few connectors and 'things' in the line as
> possible, VERY GOOD coax with first class connectors/installation, and
> everything tight .. this will help any 'shack'.  Often times this isn't 
> the
> case nor is regular maintenance a way of life.
>
> Thanks for your effort and again a lesson learned.
>
> 73, Lynn W4NL
>
>
> ----- Original Message ----- 
> From: "George K" <w2yj at highstream.net>
> To: "Discussion of Ten-Tec Equipment" <tentec at contesting.com>
> Sent: Wednesday, March 01, 2006 7:57 AM
> Subject: [TenTec] MY_ORION&O2_RF_IN_MIC-PROBLEM_SOLVED!!
>
>
>> Ever since I've had my Orion and now the Orion2 I have had RF in the mic
>> distorting my SSB signal on 20 meters. It only happens when I run high
>> power and only on 20 meters.
>> I presently run a O2, TT 706 mic, Ameritron AL-1500, Steppir 3 element
>> beam fed with 9913 coax.
>> I've tried every know remedy known to hams to solve this problem.
>> I solved it, finally, by taking the TT 706 mic apart, insulating the PC
>> board, and then making a pouch using my wife's kitchen foil wrap for the
>> PC board in the 706 mic. I left a tab on the pouch that connects to the
>> ground lug. The RF mic board is now shielded.
>> PROBLEM SOLVED!!!
>> Don't know why I had RF in the shack but at this point I don't care.
>> It doesn't help that the 706 mic has a plastic upper shell.
>> Maybe this will help someone else.
>> George
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