Re: [TenTec] Orion II AM Mic Adjustment

["Ron Castro" <ronc@sonic.net>]

Or save the cash and build your own:

http://amfone.net/ECSound/RFsampler.htm

        Ron  N6IE
     www.N6IE.com


----- Original Message ----- 
From: "Ken N9VV" <n9vv@wowway.com>
To: "Discussion of Ten-Tec Equipment" <tentec@contesting.com>
Sent: Wednesday, October 03, 2007 6:35 AM
Subject: Re: [TenTec] Orion II AM Mic Adjustment


> You might be interested in this new AM adjustment device from
> Tyler KW0AM (neat call):  http://www.cleanrf.com/
> de ken n9vv
>
> Bob McGraw - K4TAX wrote:
> > To correctly set these radios for AM one should have some type of 
> > waveform
> > monitor such as the old Heath SB-610 or HO-10.
> >
> > One thing that I noticed with my Omni VII and the 708A mike.  The 
> > Positive
> > modulation peaks were not 100% when the negative peaks were hitting 100%.
> > The solution, reverse the Red and White wires in the XLR-4 connector that
> > plugs into the back of the mike.  Once this was done, the positive
> > modulation is equal to the negative modulation.  Without a waveform 
> > monitor
> > being a Heath SB-610, I'd never seen the issue.  And yes, it takes more 
> > mike
> > gain for AM than for SSB.
> >
> > Even with the Heath Apache and the RCA BC transmitter I have found that 
> > mike
> > phase does make a difference in modulation symmetry.  A monitor scope 
> > will
> > tell the true story.
> >
> >
> > 73
> > Bob, K4TAX
> >
> >
> > ----- Original Message ----- 
> > From: <ac9s@mchsi.com>
> > To: <tentec@contesting.com>
> > Sent: Tuesday, October 02, 2007 2:52 PM
> > Subject: [TenTec] Orion II AM Mic Adjustment
> >
> >
> > > I have begun to play with AM on the O2 and it appears the microphone
> > > settings
> > > are significantly different than with SSB.  I am running a Heil Goldline
> > > through an NCS multiswitcher.  With the current gain setting on the NCS
> > > box I
> > > have the red led on the O2 flickering with the O2 software mic setting 
> > > at
> > > 18.
> > > Today I checked in with an AM group on 3875khz and was informed that my
> > > audio
> > > was light.  Sure enough, there was no flicker on the led.  I turned the
> > > mic
> > > gain almost up to 100 - I could see increased gid current on my 
> > > amplifier,
> > > but
> > > never a sign of the led lighting.  The group informed me the audio level
> > > had
> > > increased, but that it was still a little on the light side.
> > >
> > > Does the LED work on AM?  Should the mic gain be radically different
> > > between
> > > SSB and AM?  I didn't see anything specific in the manual.
> > >
> > > Thanks for any input on the proper way to set the mic gain on AM.
> > >
> > > Keith
> > > AC9S
> > > _______________________________________________
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> > > TenTec@contesting.com
> > > http://lists.contesting.com/mailman/listinfo/tentec
> >
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