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Frederick (Plantronics) Model 1273 FSK Teletype Keyer / Demodulator - Nice Unit
Frederick (Plantronics) Model 1273 FSK Teletype Keyer / Demodulator - Nice Unit
Frederick (Plantronics) Model 1273 FSK Teletype Keyer / Demodulator - Nice Unit
Frederick (Plantronics) Model 1273 FSK Teletype Keyer / Demodulator - Nice Unit
Frederick (Plantronics) Model 1273 FSK Teletype Keyer / Demodulator - Nice Unit
Frederick (Plantronics) Model 1273 FSK Teletype Keyer / Demodulator - Nice Unit
Frederick (Plantronics) Model 1273 FSK Teletype Keyer / Demodulator - Nice Unit
Frederick (Plantronics) Model 1273 FSK Teletype Keyer / Demodulator - Nice Unit
Frederick (Plantronics) Model 1273 FSK Teletype Keyer / Demodulator - Nice Unit
Frederick (Plantronics) Model 1273 FSK Teletype Keyer / Demodulator - Nice Unit
Frederick (Plantronics) Model 1273 FSK Teletype Keyer / Demodulator - Nice Unit
Frederick (Plantronics) Model 1273 FSK Teletype Keyer / Demodulator - Nice Unit

Frederick (Plantronics) Model 1273 FSK Teletype Keyer / Demodulator - Nice Unit

$ 26.37

Availability: 100 in stock
  • Brand: Frederick / Plantronic
  • Modified Item: No
  • Condition: Unit powers up, fuses are good, but otherwise untested. We do not have the means to test this unit but if you have TTY equipment already in place, that should be easy for you. It is in prime physical condition, very very clean and mil spec constructed. In the right hands this will be a sweet unit. See pictures and ask questions NOW. A copy of the original manual is included.
  • Non-Domestic Product: No
  • Model: 1273/S1
  • Custom Bundle: No
  • Compatible Brand: HAL Communications
  • Country/Region of Manufacture: United States
  • Country of Manufacture: United States
  • MPN: 52582
  • All returns accepted: ReturnsNotAccepted
  • Type: Teletype Communications Terminal

    Description

    Description Corrected 08/12/2020 - A copy of the Plantronics/Fredericks Manual comes with this set.
    For Sale:
    A Frederick / Plantronic Model 1273/S1 FSK Teletype Keyer - Demodulator set for a single shift.  As set up, this has a frequency shift of 850kHZ and looks at baud rates of 75 or 600.  Shift frequency is determined by two crystals labeled Mark & Space on the Tone Keyer board inside the unit.  The installed crystals are Mark 2182.5 kHZ and Space 1417.5 kHZ.  The I/O lines are attached from the rear and there is a switch to toggle I/O to coax (75 ohm) or open lead (600 ohm).  Construction is mil spec: G10 boards with protective coating.  Power supply appears good as unit powers up and all fuses are good.  We are including a full copy of the original Fredericks/Plantronics manual.
    The 1273 is a single shift unit so far as I can tell, designed for dedicated "slave" service.  Examples of possible application include ITTY, ham radio narrow shift, or dedicated and secure between office data connection for a business.  If you have a RTTY chum across the way, both units that I have for sale could be deployed for DX alerts or packet relay.  Unfortunately, we do not have a manual for these and do not know where a manual might be found.  Unit measures 2" high and 19" by 19" in size.  We have three of these to sell; this sale is for one (1).  If you have a good friend who is also a RTTY enthusiast, here's a chance to set up your own private network prior to changing them up for standard practice.  For ham use,
    recrystallize using 2125 kHZ for the MARK frequency (for both 170 & 850 shifts) and use 2295 kHZ and 2975 kHZ for SPACE respectively.
    Should be a lot of fun for the right person.
    Condition:
    Excellent physical condtion.  Unit powers up fine.  Keyer output level still set and responds when selected.  Otherwise, we have no way to further test this unit.  This sale now includes a copy of the original manual.  An experienced teletype person should be successful recrystallizing the unit to amateur radio preferences.
    Re-purposing this involves changing the upper & lower shift point crystals and adjusting, to what extent possible, the baud rate.
    Terms:
    Sold as described but strictly as is.  We do not accept returns as we are downsizing and not retailing.
    Shipping:
    We are estimating the single shipping.
    Teletype Enthusiasts:
    The best way to support the teletype interests of amateur radio is to put a RTTY or AFSK or FSK signal on the air.  It does not matter if anyone comes back to you right away it only matters that signals start populating the teletype areas.  Get other amateurs used to hearing teletype as well as honoring the traditional teletype spaces.  Use prearranged schedules to QSO with other teletype stations when you can.  Eventually the mode will begin getting some use.
    If you need transmitting equipment to do this, I have several vintage tube based units that will work fine.  You know the rule:  use it or lose it.  Let's not let it die without an effort to keep the real machines on the air.