[TenTec] RFI into Orion II

[Troy, W6HV]

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 at contesting.com] On Behalf Of Troy, W6HV
Sent: Thursday, February 18, 2016 6:00 PM
To: tentec at 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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