Hi Ken;
Thanks for your help/comments on my TT 670 Keyer and
Omni "C"! Well, I read my Omni manual carefully on
KEY Jack and the last sentence reads and I quote; "Any
ten-tec keyers whether relay or transistor tyypes will
key the Omni! I hooked up the '670 again and it
worked perfectly! Maybe, somehow, I had it plugged
into the wrong phono jack in the Omni? Anyway, it is
working great and I want to thank you for your help,
Ken! Vy 73, de KO8S, Karl
--- Ken Brown <ken.d.brown@hawaiiantel.net> wrote:
> Hi Karl,
>
> Most keyers I have ever heard about are designed to
> switch the keying
> lead of the transmitter (or transceiver) to ground,
> so they are
> compatible with any rig (careful, read below) that
> can also use a
> straight key or bug. Straight keys and bugs are
> purely mechanical
> devices that provide a simple contact closure.
> Almost always, one side
> of the key is grounded and the other lead, which is
> connected to the
> keying input of the transmitter, is connected to
> ground when the key
> contacts are closed. Electronic keyers were
> originally designed to plug
> into the same keying input jack as a straight key.
> Bugs often had a
> wedge connector that could be inserted between the
> open contacts of a
> straight key. In any case, the point is that most
> keyers switch a keying
> lead to ground, and most transmitters have a keying
> lead that activates
> the transmitter when grounded.
> Where you need to be careful is with older tube
> equipment which may have
> hundreds of volts on it's keying lead. Some
> electronic keyers are
> designed to work with this and some are not. Often
> newer electronic
> keyers will have an output device (transistor or IC)
> with a voltage
> rating such that it will be fried by connecting it
> to an older tube rig.
> Some tube rigs may also have a negative voltage on
> the keying lead,
> which needs to be pulled to ground to key it (most
> solid state rigs will
> have a positive voltage), so even if the output
> device of the keyer
> could handle the voltage, it would not conduct in
> that direction.
> Therefore many keyers have jumpers that can be
> configured to work with
> either polarity, or they have two separate output
> connectors for keying
> either a positive or negative voltage keying input.
>
> Ten-Tec made some tube transmitters long ago. I
> suspect however that the
> 670 key was designed to work with ANY solid state
> Ten-Tec transceiver,
> except perhaps their older tube products (which are
> fairly rare I believe).
>
> If connecting the keyer to your Omni C shuts the rig
> down, there is
> either something wrong with the keyer or something
> wrong with the way
> you have connected it.
> Does a plain straight key shut down the rig when
> connected and keyed?
> Maybe someone has already fried the output
> transistor on the keyer. In
> that case I would expect it either to not work at
> all, or to key the rig
> continuously, but not to shut it down. There is
> something wrong with
> this picture.
>
> DE N6KB
>
>
> Karl Schwab wrote:
> > Gentlemen; I have a Ten-Tec 670 Keyer that appears
> to
> > be designed for only use with the Century 21
> > transceiver. I tried it on my Omni "C" series
> > transceiver, and it immediately shut the
> transceiver
> > down! So, it guess it will not work on this
> > transceiver, but I am wondering if it might work
> on my
> > Argonaut 509 transceiver? Anyone know? I'm
> afraid to
> > try it! If I can't use it, I'll consider trading
> for
> > another keyer or selling this one. Thanks for
> your
> > comments, de KO8S
> >
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