Then the problem is probably isolated to the SSM2166 mic preamp chip in the
A7 section (schematic 81917_9.pdf) or its associated components, U201AA or
U200A (Main Codec, schematic 81917-6.pdf). The U200A chip could have a
problem although it's not in complete failure mode, or you would have no
receive audio in the speakers. The headphones are fed from the chip that
handles the Aux input.
My first course of action would be to look at all the cables and connections
from the back of the mic connector through to the A7 board, and all
associated connectors and cables to and from that board, plus 'the usual
suspects' like bad solder joints, etc. If there is nothing obvious, then a
trip back to Dolly Parton Parkway is indicated!
Ron N6AHA
----- Original Message -----
From: "Ronald Gorski" <R.Gorski@Astronautics.com>
To: "Ron Castro" <ronc@sonic.net>
Sent: Monday, March 20, 2006 11:19 AM
Subject: Re: [Orion] O2 Tx audio quality
At 11:03 AM 3/20/06 -0800, you wrote:
Another question---can you check if the distortion is also on the Aux
input as well? If it is not, that narrows down the problem quite a bit.
Ron N6AHA
Funny you should mention that! I have an old electret mike with an
equalizing pre-amp. I connected same to the AUX input last night (just
because I didn't have an 8 pin cable made up). I set the aux mike gain at
50 and adjusted the pre-amp output til I had plenty of ALC action. Turned
up the monitor to near max so as to pick up any audio flaws. The audio (at
the monitor) sounded GREAT. Switched back and forth between the Heil
(connected to the front 8 pin connector) and the electret and the
difference was substantial.
I have yet to check this with an on-the-air report.
Ron N9AU
----- Original Message ----- From: "Ronald Gorski"
<R.Gorski@Astronautics.com>
To: "Ron Castro" <ronc@sonic.net>
Sent: Monday, March 20, 2006 10:30 AM
Subject: Re: [Orion] O2 Tx audio quality
At 09:01 AM 3/20/06 -0800, you wrote:
A couple of questions:
--Have you tried a Master Reset?
Yes, I have performed master resets following firmware updates. The TX
audio issue has been with me since day 1.
--Can you hear the raspy sound in the monitor?
Yes, I can hear it in the monitor. Doesn't matter what user setting I
have nor the type of microphone. TX into antenna same as TX into a dummy
load.
--Can you hear the raspy sound in another receiver?
Yes, another receiver sounds same as the monitor. Audio is
intelligible.........just not world class.
--What happens if you turn down the mic level control to the point where
the ALC light is not flashing?
On-air reports indicate some improvement when gain is reduced to low
level (35). The improvement is not, however, significant.
--What power supply voltage are you running and how much does it dip at
the rig connector under key-down, full power?
I am using the TT 22A continuous supply. I have no voltage monitor
connected.
I heard another O2 user over the weekend who's audio sounded distorted,
but since I was just getting ready to leave the house I didn't have a
chance to talk to him. If I run into him again (he's usually around on
75 at night) I'll see if I can get an idea about what might be causing
his problem, and report it back here.
Please do. I think there are more of us out there. I am starting to think
that there may be a hardware problem with the audio board.
73, Ron
Ron N6AHA
----- Original Message ----- From: "Ronald Gorski"
<R.Gorski@Astronautics.com>
To: <orion@contesting.com>
Sent: Monday, March 20, 2006 6:32 AM
Subject: [Orion] O2 Tx audio quality
I have received reports of a raspy edge on all voice peaks. The problem
does not appear to be RFI related nor is it affected by TX EQ or LF
roll-off settings or the type of microphone used (condenser mike or
heil
GM-5). I know of one other O2 owner that has experienced the same
problem.
His is at the factory for troubleshooting. Are there others?
Ron N9AU
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