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Re: AM Audio Processors
To: CRTech <crtech@crtech.org>
Subject: Re: AM Audio Processors
From: Kevin Kidd <kkbroadcastengineering@gmail.com>
Date: Wed, 11 Jul 2018 20:03:44 -0500
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In-reply-to: <alpine.WNT.2.10.1807111625150.3956@Lyle-Dell-D630>
References: <CAB42DVoxm0Ti9XQfxze3Qqh3TScvtL3bMLWiJ-M9P4WBcW1UAQ@mail.gmail.com> <1408412207.3618221.1531345986177.JavaMail.zimbra@bevcomm.net> <1023527894.3006318.1531346206610@mail.yahoo.com> <alpine.WNT.2.10.1807111517450.3956@Lyle-Dell-D630> <1929826360.1503180.1531349487572@44df6e339ec7456991ca2c6dfe5728e0.nuevasync.com> <alpine.WNT.2.10.1807111625150.3956@Lyle-Dell-D630>
Lyle,

I think that your question may have already been answered by that mythical "Turbo" being that some of us see quoted here but never witness in person...  If your client can set the asymmetry control to 100 (ie, 100%+/-) and see what the mod monitor thinks then.

As you mentioned, the processor should always be at the transmitter end for max peak control.  The STL could definitely be messing with your symmetry.  Especially if it is being over-driven itself.  The quality of your STL shot can also impact mod levels and symmetry...

Later,

Kevin C. Kidd, CSRE/AMD
Lawrenceburg, TN
AM Ground Systems Company  -  WD4RAT
kkidd@kkbc.com  --  866-22-RADIO -- 866-227-2346
www.amgroundsystems.com

On Wed, Jul 11, 2018 at 6:39 PM, RADIO DOCTOR <lylehenry@fastmail.fm> wrote:
Thanks, Turbo and Laverne.  Yeah, I agree that the 9200 should be at the transmitter and I'll see what I can do to get it moved there.  And I'll ask what the asymmetry control is set at.  Xmtr supposedly isn't capable of quite that much peak modulation at the power output it's running, 5.2kW, so maybe some distortion, and I'd rather keep it legal, anyway.

I'm sure the IF transformers in Grandma's cheap old Zenith tube table radio in my bedroom aren't limiting the AM audio frequency response much :)


On Wed, 11 Jul 2018, Laverne Siemens wrote:

The 9200 can create that kind of asymmetry of the pos peak control is turned up that high and the transmitter can reproduce it.

Laverne - mobile

  Original Message
?? From: lylehenry@fastmail.fm
Sent: July 11, 2018 5:30 PM
To: crtech@crtech.org
Reply to: crtech@crtech.org
Subject: Re: [CRTech] AM Audio Processors

Two questions for the group:

I have an Orban 9200 at the studio ahead of a Marti STL-10 mono system.
The xmtr hits positive peaks of 140% regularly while negative is tight
at 100% all the time.  Could the STL be messing with the asymetry as I
don't think the 9200 would create that kind of difference.
Interestingly, it's not particularly loud over the air.

I'm also wondering if it would make sense to cut the audio bandwidth in
half from the 9200, say 4.5kHZ instead of 9-ish to stop wasting
modulation on frequencies that almost no receivers except the modulation
monitor can pass?

Remember, I'm an FM guy :)


On Wed, 11 Jul 2018, JIm Turvaville wrote:

I installed my first VOLT on an AM just last month - was amazed at the
great sound and really clean.  Positive and Negative were right on
spec and easy to set up.  Jim "Turbo" Turvaville SBE Certified Radio
Engineer Turbo Technical Services PH: 719-459-1859 www.jimturbo.com


FMeXtra digital SCA systems - encoders and receivers
SCA/FM/FMeXtra radios: fixed & tunable-wood cases-nice sound
Sidekick SCA generators - 67/92kHz-checked and calibrated
--------------------------------------------------------------
  Lyle Henry, CPBE  THE RADIO DOCTOR  K9DKW  Los Angeles, CA
SCA Consultant:  Brazil, China, India, Mexico, Taiwan, SE Asia
       323-660-4690 Home/Office     213-880-4690 Mobile
--------------------------------------------------------------


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FMeXtra digital SCA systems - encoders and receivers
SCA/FM/FMeXtra radios: fixed & tunable-wood cases-nice sound
Sidekick SCA generators - 67/92kHz-checked and calibrated
--------------------------------------------------------------
  Lyle Henry, CPBE  THE RADIO DOCTOR  K9DKW  Los Angeles, CA
SCA Consultant:  Brazil, China, India, Mexico, Taiwan, SE Asia
       323-660-4690 Home/Office     213-880-4690 Mobile
--------------------------------------------------------------


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Follow-Ups: Re: AM Audio Processors
(RADIO DOCTOR <lylehenry@fastmail.fm>, 12 Jul 2018 04:53:41 -0000)
References: AM Audio Processors
(Tom Van Gorkom <tomvangorkom@gmail.com>, 11 Jul 2018 19:16:24 -0000)
Re: AM Audio Processors
(Mark Carol Bohnett <mbohnett43@bevcomm.net>, 11 Jul 2018 21:53:21 -0000)
Re: AM Audio Processors
(JIm Turvaville <jimturbo61@yahoo.com>, 11 Jul 2018 21:56:54 -0000)
Re: AM Audio Processors
(RADIO DOCTOR <lylehenry@fastmail.fm>, 11 Jul 2018 22:30:07 -0000)
Re: AM Audio Processors
(Laverne Siemens <lsiemens@goldenwestradio.com>, 11 Jul 2018 22:51:38 -0000)
Re: AM Audio Processors
(RADIO DOCTOR <lylehenry@fastmail.fm>, 11 Jul 2018 23:39:42 -0000)
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