[TenTec] RFI into Orion II

Fri Feb 19 15:00:35 EST 2016

Hey, Billy

This Orion is supposed to have the "add on filter." The sound is as though 
the ground for the mic has been lost--heavy hum but with distortion.  I have 
not had trouble like this in the other microphones I use.

73,
Troy, W6HV

-----Original Message----- 
From: Billy Cox
Sent: Friday, February 19, 2016 11:39 AM
To: Discussion of Ten-Tec Equipment
Subject: Re: [TenTec] RFI into Orion II

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 at verizon.net>
To: "Discussion of Ten-Tec Equipment" <tentec at 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 at 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 at 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 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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