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Message-ID: <3605994D.E8896792@lightspeed.net>
To: <tentec@contesting.com>
Date: Sun, 20 Sep 1998 17:09:49 -0700
From: w6ru <w6ru@lightspeed.net>
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To: Jim Reid <jreid@aloha.net>, tectec@contesting.com
Subject: Re: [TenTec] Omni QSK with Alpha's 87A QSK
References: <003001bde4e4$25d5ffe0$0f070ccf@gl400>
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In reference to below...I just measured the "TX EN" RCA jack at about 9 to 10
volts approximately. The "TX OUT" jack has 0 volts. If this 9 volts from "TX
EN" jack does not connect to the "TX OUT" jack then the Omni will not
transmitt. THIS IS A STEADY STATE voltage...present there when the omni is in
RX or TX. This allows a TenTec amplifier to break this loop so the amp is keyed
first then the Omni gets the "go-ahead" to transmit.
For QSK between the Omni 6 and 87A it appears to me that your keyer will have
to key the 87A ("relay" jack) and the 87A ("key out" jack) keys the CW key
input of the Omni.
Now, what to do about SSB ????? Another can of worms.
Terry - W6RU
Jim Reid wrote:
>
>
>
>
> To quote the Ten Tec manual once again, "...the Logic board
> generates a transmit acknowledge voltage at connector 63.
> This signal [whatever it might be?] becomes the external
> keying loop that is normally jumpered on the rear panel.
> If an external [QSK capable] amplifier is to be used, it
> can be included within the keying loop so that the amplifier
> can control the [QSK] timing of the keying and prevent hot
> switching."
>
> So, as the 87A requires a closure to gnd. from such a
> keying loop, and provides the same back to the loop,
> i.e. a sink to ground, isn't that exactly what the Ten Tec
> loop is doing when Q11 conducts on the Omni Control
> Board, Fig. 4-18, pg. 4-17 of the VI+ manual?? Or,
> perhaps it is the exact opposite in the Omni: lifted
> from gnd. as the transmit signal within the keying
> loop. No way to know which way it is from the schematic,
> at least I don't see it. But in reading the above quoted
> text, it would seem that Q11 conducts when the key
> acknowledge signal is present, thus providing the
> "virtual" key closure to gnd.
>
> Anyway, I am still not getting this set up to operate QSK.
>
> 73, Jim, KH7M
> same back to
>
> --
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>
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