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Re: [TenTec] RFI question for Orion and other TT rigs

To: Tentec <tentec@contesting.com>
Subject: Re: [TenTec] RFI question for Orion and other TT rigs
From: Robert & Linda McGraw K4TAX <RMcGraw@Blomand.Net>
Reply-to: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Tue, 28 Jun 2005 08:05:10 -0500
List-post: <mailto:tentec@contesting.com>
While this works, be advised that the end of each 1/4 wave presents a very 
high voltage which can be in the order of a couple of thousand volts.

If one is using a center fed balanced antenna system, no ground is actually 
needed.  If one is using a center coax fed antenna or beam, no ground is 
needed.  On the other hand, if one is using an off-center fed antenna, or a 
vertical, or a sloper or end fed wire then a good ground system is need. 
(Topic for another discussion.)

In all cases, the 3rd pin ground should be used for safety reasons.  No 
exceptions.  If due to equipment configuration you have hum, then deal with 
the ground loops correctly.  Do not eliminate the use of the 3rd pin ground. 
Your life may depend on it.

Bob, K4TAX

----- Original Message ----- 
From: "GARY HUBER" <glhuber@msn.com>
To: "Discussion of Ten-Tec Equipment" <tentec@contesting.com>
Sent: Tuesday, June 28, 2005 7:45 AM
Subject: Re: [TenTec] RFI question for Orion and other TT rigs

> One "easy" way to reduce the "RFI in your shack" is the old time 
> counterpoise. Just a quarter wave length of wire for each band, connected 
> at the ground post of your transceiver and then strung out along the 
> baseboard. I've used a multi-conductor cable, like rotor cable, all 
> conductors soldered together at the termination, but with each conductor a 
> different quarter wave length and the excess wire removed. It works even 
> when the ground rod below the desk doesn't.
> 73,
> Gary - AB9M
>  ----- Original Message ----- 
>  From: Tommy Alderman<mailto:aldermant@alltel.net>
>  To: 'Discussion of Ten-Tec Equipment'<mailto:tentec@contesting.com>
>  Sent: Saturday, June 25, 2005 9:52 PM
>  Subject: Re: [TenTec] RFI question for Orion and other TT rigs
>  Roy,
>  One of the best and easiest ways to avoid "RF in your shack" is to make
>  sure that one half the length of your antenna plus the total length of
>  your feed line is NOT an odd quarter wavelength long. The reason for
>  that is if that total is an odd quarter wavelength, you will have a
>  maximum voltage field in your shack. The second most easiest thing to
>  avoid is do not let the end of any of your antennas terminate directly
>  over your shack, as that too, is a high voltage field point.
>  Tommy - W4BQF
>  -----Original Message-----
>  From: tentec-bounces@contesting.com<mailto:tentec-bounces@contesting.com>
>  [mailto:tentec-bounces@contesting.com] On Behalf Of
>  rsrocket1@comcast.net<mailto:rsrocket1@comcast.net>
>  Sent: Friday, June 24, 2005 11:01 AM
>  To: tentec@contesting.com<mailto:tentec@contesting.com>
>  Subject: [TenTec] RFI question for Orion and other TT rigs
>  Dear List,
>  This is in no way a flame on anything, but I would like to know which
>  Ten-Tec rigs are prone to a "dirty" RF shack.  I've heard the Jupiter is
>  prone to having problems in a shack with stray RF in it.  I would like
>  to know if the Orion has the same problem or if any of the older TT rigs
>  do.  I know for a fact that the Century 21 does not because I used it
>  without problems.
>  I know that cleaning up the RF is the best solution, but I am always
>  experimenting with antennas, feed lines, baluns, etc. and I have never
>  had operational problems with the Icom, Yaesu, Kenwood or Alinco radios
>  that I've used.   I've been "tickled" a number of times when touching
>  knobs while transmitting, but it seems to be as much dependent on the
>  radio as it is with the antenna or feeding system.
>  By the way, I just picked up my first Yaesu HF rig, an FT-101E basket
>  case.  What a joy it is to work on.  Separate removable PC boards, lots
>  of easily reached adjustment points, and an excellent user and service
>  manual seemingly written for a competent ham, not a service technician
>  to understand.  A couple of evenings and it was back to good working
>  order.  It's nice to have an appliance to "turn on and talk", but it's
>  also a lot of fun to "work" a radio while tuning across the bands.
>  73
>  Roy
>  AD6ZU
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