[SBE] Harris HT40 TV transmitter question

[Curt Yengst]

We already have it connected to the Burk.  No trouble there.  What we're trying to do is get the transmitter to ignore it's disconnected aural modules.  It starts just fine without them, but then it sends erroneous module fault alarms, because it can't find the aural modules and assumes they are in a fault condition.
 
On this particular transmitter there are four PA cabinets, each with 14 visual PA modules and 3 aural PA modules.
 
If a module goes bad, we want the transmitter to tell the Burk, but only if it's a module that is acually in use.
 
There's probably a modification we can make somewhere, but I thought I'd put this out there before "reinventing the wheel."  IYKWIM
 

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From: sbe-bounces at sbe.org on behalf of Michael J. Maville
Sent: Tue 6/22/2010 4:56 PM
To: sbe member discussion mail list
Subject: Re: [SBE] Harris HT40 TV transmitter question


Hi Curt.
 
I'm sorry, I'm a little confused here. Are you trying to connect the system to a Burke? 
 
Or trying to get the system to ignore the aural module fault and does this prevent startup?
 
Also, does the exciter have any fault monitoring that could be wired to the Burke?
 
I ask because if it's just the Burke to be wired and you could wire the exciter to it, if you lost RF and the exciter was OK, then the visual module would have to be bad. 
 
Or RF system. Anyways, at that point it would need physical inspection anyways.
 
Make sense?
 
Michael J. Maville
Director of Engineering
WXEL TV42/FM90.7
Barry Telecommunications, Inc.
 
Office: 561-737-8000
E-Mail: MMaville at wxel.org 

	----- Original Message ----- 
	From: Curt Yengst <mailto:cyengst at star991fm.com>  
	To: sbe at sbe.org 
	Sent: Tuesday, June 22, 2010 4:20 PM
	Subject: [SBE] Harris HT40 TV transmitter question


	I'm not a TV engineer, nor do I play one on TV; but I'm currently assisting at a local TV station.  We've installed a Harris HT40 which was purchased second-hand.  Everything works great except for one thing.....
	
	We're not using the stock exciters, nor are we using the aural modules in the PA cabinets.  Since the station is digital, we're using an after-market digital exciter and using the visual PA's to amplify that signal.  We've disconnected the aural modules from the power supplies, and the stock exciters are completely removed.
	
	We now get, as can be expected, module fault alarms and exciter alarms on the display in the control cabinet.  The exciter alarms are not the big issue here, but the module alarms are.  We know the alarms are caused by the fact that the aural modules are disconnected.  The problem comes if and when we have a legitimate visual module fault.  There's no way to tell.  This prevents us from connecting the module fault alarm to our Burk remote system.
	
	Has anyone else been through this configuration already, and could you suggest a way to "fool" the transmitter into seeing good aural modules, or even getting it to just ignore the disconnected modules?
	
	Curt
	

	
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