Tom,
I posted earlier, several times, that connecting pin 2 to chassis
ground on the Orion is NOT recommended by either Ten-Tec or by any of us
who have tried it. I also have the ProSet, but have not made any mods
yet to see how to fix this issue. It is a real problem for me, and some
others, but not for everyone. I definitely have RF in the shack due to
close proximity of antennas, but do not have any problem with a TT 705
microphone. I plan to split out the PTT ground from the audio return
circuit first, but just haven't had time to try it.
73, Duane
On Thu, 23 Dec 2004 08:10:52 -0500 "Tom Wagner" <tfwagner@snet.net>
writes:
> I failed to point out that this is using a stock Heil
> Proset which has only one wire plus a shield to the mic.
>
> I'm sure with a two-wire + shield situation that grounding
> the shield is the proper approach
>
> 73,
> Tom
>
> -----Original Message-----
> From: tentec-bounces@contesting.com
> [mailto:tentec-bounces@contesting.com]On Behalf Of Tom Wagner
> Sent: Thursday, December 23, 2004 8:08 AM
> To: tentec@contesting.com
> Subject: RE: [TenTec] Orion Mic Woes - Sounds like RFI but Wasn't
>
>
> I tried connecting the shield to the mic connector and the
> RFI-like noise was worse than ever. My Orion shows 1/2 ohm
> resistance between the mic connector and the rear ground lug.
>
> 73,
> Tom
>
> -----Original Message-----
> From: tentec-bounces@contesting.com
> [mailto:tentec-bounces@contesting.com]On Behalf Of N0KHQ@aol.com
> Sent: Sunday, December 19, 2004 7:42 PM
> To: tfwagner@snet.net; tentec@contesting.com
> Subject: Re: [TenTec] Orion Mic Woes - Sounds like RFI but Wasn't
>
>
> Hi Tom and Group,
>
> If you want to know if you have the later version of the Orion, take
> a
> multi-meter and set it to OHMS. One lead will go to the Orion mic
> connector,
> the
> other lead will go to the ground wing nut on the back of the Orion.
> If the
> meter shows a direct SHORT, you have the later version (this is
> because the
> Orion
> mic connector is chassis grounded). If the meter shows an OPEN or
> any
> resistance at all you have the earlier version. (Orion mic
> connector not
> chassis
> grounded).
>
> Assuming Orion later version: (Orion mic connector grounded to
> chassis)
>
> There should be 2 wires coming off of the mic Element. Possibly
> white and
> (red or black). If you look real, real close at where the wires are
> soldered
> to
> the element you may see a + sign and a - sign. Maybe! If not, I
> would
> choose
> the white wire as being the Audio hot lead (+ send) and the other
> wire
> would
> be the Audio ground lead (- return)
>
> If I were you, I would purchase some good quality mic cable. This
> cable
> will
> have 2 wires (usually white and red) that are surrounded by a shield
> wire.
> Additional wires may be in the cable but they will be by them selves
> (not
> wrapped within the shield) these wires can be used for PTT or
> whatever).
> Heil
> sells excellent mic cable, very well shielded.
>
> The shield of the cable connects between the mic housing case and
> the mic
> connector on the other end of the mic cable. Thats all it does.
>
> One of the wires that is surrounded by the mic cable shield wire
> will
> become
> the audio hot lead + (send) usually white, the other wire will be
> the audio
> ground lead - (return) usually red.
>
> The Audio + lead (white (send)) will go to Pin #1 on the Orion, the
> Audio -
> lead (red (return)) will go to Pin #2 on the Orion. PTT wire (PTT
> grounds
> to
> chassis) (1 wire only) will go to Pin #3 on the Orion. Inside your
> mic PTT
> switch you may have to run a wire from there to the mic housing
> shield.
>
> Or
>
> You can send your Audio in through the rear of the Orion like I do
> at line
> level and say "to hell with the Orion mic connector". There are 3
> ways to
> key
> the Orion, 1 is through the rear of the rig. The other is a 1/4"
> mono phone
> plug inserted into the "CW" on the front of the Orion (requires a
> Menu
> change)
> and 3rd is to use the mic PTT Pin #3.
>
> You have a whole lot of choices, just choose the right one for you.
>
> Happy Holidays.
>
> John / N0KHQ
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>
>
Duane Calvin, AC5AA
Austin, Texas
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