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[TenTec] Omni VI Meter Lamp dimming

To: tentec@contesting.com
Subject: [TenTec] Omni VI Meter Lamp dimming
From: Ken Brown <ken.d.brown@verizon.net>
Reply-to: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Sat, 11 Feb 2006 12:15:44 -1000
List-post: <mailto:tentec@contesting.com>
The meter lamps on my Omni VI dim noticeably when either the VOX or 
SPLIT LEDS are lighted. It is doubtful that this is due to a power 
supply lead voltage dropping from the increased load of the LEDs, for 
two reasons. The amount of current the LEDs use is probabaly less than 
20 mA each, and the controlled voltage source for the meter lamps is on 
a completely different board, the Low Level Driver Board. So the 
amplitude or duty cycle of the "digit driving pulses" coming from the 
LED Display Drive Board must be changing when the SPLIT or VOX LEDs are 
turned on. This doesn't seem right.

Anyone else with an Omni VI notice this, or know what the cause is?

I also found some inconsistancies in the LED Display Board Schematic. 
Several of the seven segment displays have two "CAT"s and no "COL", 
which I presume are cathodes and collectors. And a bunch of the "CAT"s 
and "COL"s show no connection. Doesn't seem right.


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