As I remember, the ones I built used BCD input from the rig, and open
collector 2n3904s driven by a BCD to 7-segment display driver.
Phil C. Sr.
----- Original Message -----
From: "Dr. Gerald N. Johnson" <email@example.com>
Sent: Thursday, June 18, 2009 4:28 PM
Subject: Re: [TenTec] Schematic for 311 Band Data Decoder?
> On Thu, 2009-06-18 at 14:46 -0400, Eric Rosenberg wrote:
>> TT says they don't have a schematic for the 311, which apparently isn't
>> really a Band Data Decoder, but rather an inverter.
>> Have any of you opened up the box and looked at it.. or reverse
>> it? I'd like to control my Herc II with something other than my Orion,
>> am not sure how to wire it up.
>> Eric W3DQ
>> Washington, DC
> http://www.tentecwiki.org/webarchive/311/ Says its an inverter. Takes
> open collector lows from the Orion and pulls its outputs high using a
> surface mount 2N3906 PNP transistor on each line. Probably ties the
> transistor emitters to +13 volts, and has a 1.5 K resistor from each
> transistor base to the input pin. There could be a LED in series with
> each resistor for an indicator. Maybe a 1.5K resistor from transistor
> base to emitter to guarantee shut off. It that's all its doing, that's
> about how I would do it, if the other rigs needed 13 volts pulled up for
> control. If they needed TTL, I'd use a 74HCT14 or two.
> But without the Orion documentation, I can't say what pins to connect or
> how to build the cable.
> 73, Jerry, K0CQ
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