[GreenKeys] interesting ebay item, fsk modem?

Thu, 06 Mar 2003 17:50:23 +0000

That HAL ST8000 looks suspiciously like the
Frederick 1280!

Jack WA2HWJ

NNNN
> Greenkeyers -
> 
>   These are Frederick 1280A units.  They are real slick TUs, but the
> seller is not specific about two items...
> 
> 1.  The standard 1280A has only RS-232 & MIL-188 interfaces.  Frederick
> offers a current loop interface as an add-on option, but none of the pix
> or text mentions this option.
> 
> 2.  The 1280 & 1280A will indeed do diversity reception -  there are
> separate PC boards for FSK transmit & FSK receive.  A 1280A can be
> loaded with two transmit cards or two receive cards, or one transmit &
> one receive card.
>   There are two 1280A units in the auction, but none of the text or pix
> mention which boards are present in the units.
>   The best situation would be if those two units include two transmit
> cards and two receive cards.  You can mix & match the cards as you
> desire -  with the 2TX & 2RX cards you could make two transceive units.
> 
>   The 1280 & 1280A units can be controlled from the front panel, or via
> an RS-232 link.  The receive boards use commutative filters.  The
> displays are not LED, but a gas plasma panel -  the power supply for
> this plasma display is a high-mortality item.
>   The "CH" number in the display indicates which board (CHannel) the
> front panel is controlling.  For each of the two CHannels, either the
> "MOD" or the "DEMOD" annunciator will light up, indicating whether the
> selected CHannel is a transmitter or a receiver.
> 
> 
> 73
> Dave Ross    N7EPI    [email protected]
> 
> 
> [email protected] wrote:
> > 
> > I am told by the seller that it will do loop/rs232 and some other stuff!
> > 
> > > Output is RS232 or Mil-188c or Loop if desired,external power supply
> > > required max loop current 80ma. and 350 max 350 volts arc.
> > > rttyman
> > 
> > http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=3010921877
> > 
> > What do ya make of that?
> > Looks kinda neat with the LED frequency displays (supersize the pictureS)
> >
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