[TenTec] Eagle problem?

[Bob McGraw - K4TAX]

Smart man.  Good configuration.  It works.

73
Bob, K4TAX


----- Original Message ----- 
From: "Lee" <ny6p01 at gmail.com>
To: "Discussion of Ten-Tec Equipment" <tentec at contesting.com>
Sent: Wednesday, May 14, 2014 6:24 PM
Subject: Re: [TenTec] Eagle problem?


> Good advice all. The problem with ef I had to battle with my ts480 (2nd
> floor apt, floating rf ground), was the unshielded CAT5 cable that
> connected the head unit to the main chassis.
>
> I have zero rf problems with a newly acquired Jupiter. Of course I use a
> common mode choke at the antenna, use a balanced antenna design and take
> several other precautions.
>
> Lee (NY6P)
> On May 14, 2014 2:56 PM, "Stuart Rohre" <rohre at arlut.utexas.edu> wrote:
>
>> Some Yaecomwoods do suffer from RF entering the rig.
>>
>> MOST ANY rig will if you have a bad shield connection on coax jumper, or
>> have rig too close to the antenna, (second floor shack), and there are 
>> many
>> other rig and feedline issues to rule out in any RFI case.
>>
>> Rule of thumb:  Power all equipment from same circuit breaker of the
>> house.  That ensures AC grounds will not be coming from widely different
>> locations.  IF you have to use a long ground wire for lightning 
>> protection
>> ground on the station (like from second floor shack), consider that it
>> could act as an "antenna" for pick up of RF from the real antenna. You 
>> may
>> need tuned radials, or a radial for each favorite band.
>>
>> You could always examine the quality of the grounding of the mike cable
>> shield.  Some older mike cords had just a multi-strand wire wrapped in 
>> one
>> direction and not a hatch pattern wire shield.  Some aluminum foil 
>> shields
>> don't make a good low impedance connection by clamping. (Connections that
>> can't be soldered are suspect).
>>
>> You can do a step by step analysis of grounding, by starting at the mike
>> element and measure the resistance by ohm meter, of shield connection to
>> plug pin/ shell.  Use a magnifier to examine connections on inside of 
>> radio
>> at mike.  Check case to mike jack shell if that type.
>>
>> Some radios have a thru bolt to provide a "ground" terminal on back of
>> set.  Make sure this bolt if present, grounds tightly to the chassis.
>>
>> Same could be said for any stud grounds on external tuner, etc.
>>
>> Good Luck, but usually a step by step exam of all connection points will
>> show up issues.  Avoid feedlines that are odd multiples of a quarter
>> wavelength.  Add 5 feet to a line to check for those types of issues.
>>
>> It used to be a common problem if the ring on mike connectors was not
>> fully tight on the mike jack. That is less of a problem, if the mike 
>> ground
>> carries through a mike pin.
>>
>> Let us know what you do to fix the problem.
>>
>> Stuart Rohre
>> K5KVH
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