Still a good find .............
Walt K8CV Royal Oak, MI.
----- Original Message -----
From: "w8bvh" <w8bvh@sbcglobal.net>
To: "Discussion of Ten-Tec Equipment" <tentec@contesting.com>
Sent: Monday, July 13, 2009 7:53 AM
Subject: Re: [TenTec] unstable Omni D display fix-problem found
> OOOPS!!!
> That is EUR, not U.S. Dollars.
> Sorry for the quick post.
> Ralph Howes
> W8BVH
>
>
> ----- Original Message -----
> From: "Mike Bryce" <prosolar@sssnet.com>
> To: <geraldj@weather.net>; "Discussion of Ten-Tec Equipment"
> <tentec@contesting.com>
> Sent: Sunday, July 12, 2009 9:26 AM
> Subject: Re: [TenTec] unstable Omni D display fix-problem found
>
>
>> the counter-on-a-chip is a MK50398N
>>
>> the multiplex chips are 75491APC and 75492apc
>>
>> there's two 491's they are the segment multiplexer and the 492 is the
>> display multiplexer
>>
>> ( I guess technically, the 50398 does the multiplexing, and the three
>> other chips are used to decode and drive the LEDS)
>>
>> both the 75491APC and 75492apc are not stocked anymore by ten tec.
>> These chips are really hard to come by, but again, there's the part
>> miners out there that have them listed, but with $250 min to buy.
>>
>> I did a quick look at NTE and they seem to have a replacement for the
>> 491, but have not looked deeper into the project.
>>
>> there's three possibilities here with a dead Ten Tec Omni LED display
>>
>> 1. Get another junker for parts
>> 2. Use a external freq counter
>> 3. The dead one becomes the part donor
>>
>> and...
>>
>> there's a few places that sell "digital dials" that maybe used,but
>> none that I have seen drive LEDs, they are usually for LCD displays.
>>
>>
>> Mike, WB8VGE
>>>
>> What are the chips?
>>
>> 73, Jerry, K0CQ
>>
>>
>>
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>
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