Without going through all the details--I had a similar issue and found that
I had too long a power supply cable and too many unnecessary things in the
line, all of which continued to voltage drops when current was drawn during
transmit. When I cleaned things up the "flickering" went away.
Bob W2WG
-----Original Message-----
From: tentec-bounces@contesting.com [mailto:tentec-bounces@contesting.com]
On Behalf Of Richard Detweiler
Sent: Friday, January 26, 2007 11:36 AM
To: tentec@contesting.com
Subject: Re: [TenTec] Orion RF issue
I have to agree with Larry on the power supply voltage.
I resolved this issue by insuring that the voltage remained above 12.6
during transmit.
A slightly higher SWR will cause more current to draw from the power supply
thus reducing the voltage,
The screen on the Orion is sensitive to low voltages and will go white if it
drops too much.
Before I went to useing a dedicated 963, my AStron RS35M voltage would drop
below this. I had a bad regulator ( not bad but marginal ) in the thing...
Best wishes,
Richard,
K5SF
>From: "Larry Menzel" <retire@means.net>
>Reply-To: Discussion of Ten-Tec Equipment <tentec@contesting.com>
>To: "'Discussion of Ten-Tec Equipment'" <tentec@contesting.com>
>Subject: Re: [TenTec] Orion RF issue
>Date: Fri, 26 Jan 2007 10:26:47 -0600
>
>I agree with others on this, it seems that the only time I suffered from
>this was with very high swr, significant voltage drop, or the wrong
>antenna.
>
>The Orion must have a solid 25 amp supply, so if it's only say an Astron
>RM25 you need to make sure that the radio is the only thing on that supply.
>An RS or RM 35 is a better bet, yet.
>
>I guess that would be my recommendation, as well, but I'm curious about
>your
>tying your shack ground to the tower ground; I remember well, many sources
>stating that under no circumstances should the two be connected.
>
>Anyone else have an opinion on this?
>
>It would seem foolhardy to me to do so, as a strike on the tower would be
>instantly transmitted to the station grounds and could cause significant
>damage...assuming of course that all other precautions had been taken,
>unplugging equipment, etc., but I never unhook my ground system on my
>shack.
>
>Curious.
>
>Larry, N0XB
>
>
>-----Original Message-----
>From: tentec-bounces@contesting.com [mailto:tentec-bounces@contesting.com]
>On Behalf Of Natan Huffman
>Sent: Friday, January 26, 2007 10:16 AM
>To: tentec@contesting.com
>Subject: [TenTec] Orion RF issue
>
>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 < ?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 its 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 dont have a white screen when transmitting?
>
>
>
>Thanks in advance,
>
>
>
>Natan W6XR
>
>
>
>_______________________________________________
>TenTec mailing list
>TenTec@contesting.com
>http://lists.contesting.com/mailman/listinfo/tentec
>
>--
>No virus found in this outgoing message.
>Checked by AVG.
>Version: 7.5.441 / Virus Database: 268.17.11/652 - Release Date: 1/25/2007
>3:32 PM
>
>
>_______________________________________________
>TenTec mailing list
>TenTec@contesting.com
>http://lists.contesting.com/mailman/listinfo/tentec
_________________________________________________________________
Valentines Day -- Shop for gifts that spell L-O-V-E at MSN Shopping
http://shopping.msn.com/content/shp/?ctId=8323,ptnrid=37,ptnrdata=24095&tcod
e=wlmtagline
_______________________________________________
TenTec mailing list
TenTec@contesting.com
http://lists.contesting.com/mailman/listinfo/tentec
|