[TenTec] Orion RF issue

[dw]

Hi Natan,
My doublet is also up 50' and half of it runs almost directly over the
house, and zero RF problems with Jupiter at full tilt.
And the rig is not grounded at all.
Just the Power Supply to house ground.

The reason for this is a remote balanced tuner out 30' from the house.
So swr on the coax coming into the rig is comparatively flat.

I wonder if you've looked at the electrical length of the coax as the
possible issue?
Your coax might be around .18wl on 80.
If you have some spare coax lying around, try adding an extra 17' and
see if that doesn't help.

You could try coiling up this extra coax around a length of 6' PVC pipe
also.
If this works, drill holes in the ends of the PVC and tie-wrap the coax
into place.
The coil should be as far away from the rig as possible.

Just some thoughts :)

Duane
N1BBR


On Fri, 26 Jan 2007 11:16:16 -0500, "Natan Huffman"
<W6XR at Frontiernet.net> said:
> Ladies and Gentlemen,
> 
>  
> 
> Today I took delivery of an Orion with version 2.056 firmware and
> integrated, with great ease, the rig into the station.  Unfortunately I
> am
> having an issue while on 80 meters where my antenna is near the shack and
> only up 50 feet.  The station is grounded well as is the house with each
> having two 15’ ground rods and short ground wires < ¼ lamda at 80) . 
> These
> grounds are tied into 4 more at the base of the tower about 50’ away from
> the shack.  I doubt the problem (white screen when transmitting) is due
> to
> lack of grounding but rather the presence of a strong RF field generated
> by
> the 80 antenna. Just for fun (done in 4 degree wx) I disconnected the
> large
> bus to the tower base and no change.  I also checked VDC at the plug in
> the
> back providing power and it’s fine.
> 
>  
> 
> This problem is not seen on two other transceivers in the shack when used
> on
> 80, which also suggests the problem is RF from the antenna.  Might there
> be
> some remedy so that I don’t have a white screen when transmitting?
> 
>  
> 
> Thanks in advance,
> 
>  
> 
> Natan W6XR
> 
>  
> 
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-- 
  dw
  dw at sover.net