Fellas,
Interesting. Yesterday for the first time, My Orion II reflected the same
symptoms. Howevewr it was at the 35 watt level that my transmitter locked on.
It required a power off to stop it.
I run three different wire antennas, but only the one with a really good
RF choke caused the problem. The antenna is an OCF dipole with a choke 18 feet
down from the feet point, a Carolina Windom knock off.
From what I could see, the problem is RF getting into the control
processor. It was also apparent in the sound of the side tone. I'm looking to
see why I'm having a problem now since I've not had the problem before
yesterday. I think this is something that Tentec needs to look at.
Barry
K3NDM
>From: joel hallas <jrhallas@optonline.net>
>Date: Mon Mar 20 07:51:29 CST 2006
>To: Discussion of Ten-Tec Equipment <tentec@contesting.com>
>Subject: Re: [TenTec] RF Getting back into Rig Problem
>Dave,
>
>It certainly sounds like RF getting into the radio!
>
>Sometimes good grounding helps, but it is often even more important to
>find out how the RF is getting there and stop it from doing so. The
>possible sources that occur to me:
>
>RF on the coax shield - a good ground at the rig might make a big
>difference here. Also check that the coax connector backshell on the rig
>is tight. Finding out if you have the problem with a dummy load instead
>of the antenna (unlikely) may be worth knowing.
>Power leads, possibly coupled directly from the antenna if it's close or
>more likely from the power wiring. Try a different source, shorter
>leads, better a car battery close to the radio.
>Speaker or key or mic (even if on cw) leads. Unlikely, but easy to
>eliminate or, for the key, make very short.
>Computer connections. This can get coupled from phone lines if you have
>a modem, power wiring, etc. Easy to pull off and see.
>
>Once you know where it's getting in, you can address the problem more
>directly with a coax choke (6 to 10 turns of coax 10 " in diam, for
>example) on the feedline, ferrite beads on other wires, etc.
>
>Having a good ground is not a bad idea, however, you may already have a
>fair ground through the green wire of the ac line, if you're close to
>your power panel and it's installed properly. It will help some but not
>all of the sources above, and could even make some worse, depending on
>how the rig wiring is set up.
>
>Just my $0.02.
>
>73, Joel
>
>Dave Tipton wrote:
>
>>
>> The facts:
>> Rig: Jupiter with Auto Tuner
>> Antenna: 40M dipole at about 20 feet.
>> Coax: 100 Feet of RG8X
>> Keyer: MFJ Memory Keyer
>>
>> Over the weekend, we had some horrendous rain storms. This is the first
>> time I've ever encountered this issue, so I question whether that had
>> something to do with it.
>>
>> Now, I'll be the first to admit, I do not have a ground on my rig. That's
>> a problem, I'm working out this week. (10 inches of rain this weekend
>> should help that actually)
>>
>> Whenever I ran more than 50 watts, CW, the rig would key and then lock in a
>> transmit position. Turning it off and then back on would release it.
>>
>> My question(s): Is this merely a grounding problem, or am I overlooking
>> something else? Has anyone else ever experienced this?
>>
>> Thanks,
>> Dave, W3DMT
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>>
>>
>>
>
>
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