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Re: [TenTec] RFI into Orion II

To: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Subject: Re: [TenTec] RFI into Orion II
From: Billy Cox <aa4nu@comcast.net>
Reply-to: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Fri, 19 Feb 2016 19:39:00 +0000 (UTC)
List-post: <tentec@contesting.com">mailto:tentec@contesting.com>
Hi Troy, 

Two other ideas ... 1st - there was an "add on" filter board to audio input 
of the O-II, yours may or may not already that inside the cabinet ... 

2nd ... by "heavy RF" do you mean a loud hum, or lots of distortion or just 
a very strange "taking off" when you key the rig with any audio ??? 

At one time I had a similar challenge ... and finally tracked it down to ground 
loops in how I was powering multiple devices from a common DC supply. 

BTW, I am also using a stock Heil Proset with the normal Heil adapter via 
a Top Ten DXD and MicroHam Keyer here. 

Hope this helps! 

73 de Billy, AA4NU 


----- Original Message -----

From: "W6HV Troy" <w6hv@verizon.net> 
To: "Discussion of Ten-Tec Equipment" <tentec@contesting.com> 
Sent: Friday, February 19, 2016 1:18:31 PM 
Subject: Re: [TenTec] RFI into Orion II 

I certainly agree. I did open the connector plug and re-checked all. Also, Bob 
Heil suggested I connect the mic ground to the connector’s shell. (He said he 
was one of the original engineers that helped design the mic circuit in the 
first Orion.) So far, nothing has helped. I made sure of continuity for all 
connections. 
I’ll keep trying. 
73, 
Troy, W6HV 

-----Original Message----- 
From: Ted Bryant 
Sent: Friday, February 19, 2016 10:58 AM 
To: 'Discussion of Ten-Tec Equipment' 
Subject: Re: [TenTec] RFI into Orion II 

It might be worth a second look, Troy. Those pins on the solder side of that 
8-pin connector are very close and the numbers are not easy to read. it would 
be easy to be off by one ... ask me how I know. :)) 

73, Ted W4NZ 


-----Original Message----- 
From: TenTec [mailto:tentec-bounces@contesting.com] On Behalf Of Troy, W6HV 
Sent: Friday, February 19, 2016 11:56 AM 
To: Discussion of Ten-Tec Equipment 
Subject: Re: [TenTec] RFI into Orion II 

Ted, 
I goofed on what I told you. (A senior problem!) The shield goes to pin 7. I’ll 
redo all and see if I can find a mistake. 
Troy 

-----Original Message----- 
From: Ted Bryant 
Sent: Thursday, February 18, 2016 8:14 PM 
To: 'Discussion of Ten-Tec Equipment' 
Subject: Re: [TenTec] RFI into Orion II 

Troy, 

Thanks for the information. On page 9 of my Orion II manual (version 4- October 
2006), in figure 2-3 it shows pins 7 and 8 as the mic connections. 
Pin 7 is mic ground and pin 8 is mic +. Pin 6 is shown as PTT +. Pin 5 is PTT 
ground. PTT ground and mic ground should be separate. If your mic shield is 
connected to pin 6, that could be the problem. 

My ProSet is connected via a Top Ten Devices DX Doubler which is cabled to the 
mic connector on the Orion. Its pinout is as noted in the Orion manual. 

HTH! 

73, Ted W4NZ 


-----Original Message----- 
From: TenTec [mailto:tentec-bounces@contesting.com] On Behalf Of Troy, W6HV 
Sent: Thursday, February 18, 2016 10:07 PM 
To: Discussion of Ten-Tec Equipment 
Subject: Re: [TenTec] RFI into Orion II 

Ted, 
I homebrewed the adapter. The shield side of the ProSet microphone goes to pin 
6 on the Orion and the center conductor ( ProSet tip of connector) goes to the 
Orion pin 8. Using the Ten Tec model 709 microphone I get great audio. 

How is your ProSet connected? 

73, 
Troy, W6HV 

-----Original Message----- 
From: Ted Bryant 
Sent: Thursday, February 18, 2016 6:02 PM 
To: 'Discussion of Ten-Tec Equipment' 
Subject: Re: [TenTec] RFI into Orion II 

Hi Troy, 

Need a bit more information. The Orion II has an 8-pin mic connector and the 
Pro Set mic terminates in an 1/8-inch mono plug. I don't understand how it 
is connected to the radio. Are you using some sort of an adapter, a Heil 
AD-1 maybe? 

Are you sure the mic connection is the path of RF ingress and not the 
headphone connection? Have you tried a different mic? Have you checked 
the bonding of the Orion's chassis to all the other equipment? 

I'm using a Heil ProSet with my Orion II without any rfi. 

73, Ted W4NZ 


-----Original Message----- 
From: TenTec [mailto:tentec-bounces@contesting.com] On Behalf Of Troy, W6HV 
Sent: Thursday, February 18, 2016 6:00 PM 
To: tentec@contesting.com 
Subject: [TenTec] RFI into Orion II 

I recently got a Heil Pro Set 6 and tried to use it with the Orion II. The mic 
cable is a shield conductor with the center conductor to the tip of a plug and 
the case is connected to the shield. This causes the mic to have no RF shield 
and the result is heavy RF into the Orion mic input. Does anyone have a 
solution? I have tried a FT-240-J toroid, decoupling with a 1:1 600 ohm 
transfomer and both windings by-passed with .001 caps. The only thing I can 
think of is the place shielding con the cable (ugly!). Any help? 
73, 
Troy, W6HV 
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