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Collins 189A-2 external hybrid phone patch accessory for the KWM-1 / 75A-4 / KWS-1 / 312A-2 in Very Nice Condition #2

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MPN:
189A-2
Condition:
Used
Shipping:
$12.00 (Fixed Shipping Cost)
  • Collins 189A-1 External Hybrid Phone Patch in excellent condition. Classic Collins accessory for phone patch operation, allowing telephone line connection to your transceiver for third-party or remote contacts. Designed for use with Collins KWM-1, KWS-1/75A-4, and compatible with S-Line/KWM-2 equipment. Features hybrid transformer circuitry for clean audio balancing and isolation. Simple terminal connections – easy setup
  • Collins 189A-1 External Hybrid Phone Patch in excellent condition. Classic Collins accessory for phone patch operation, allowing telephone line connection to your transceiver for third-party or remote contacts. Designed for use with Collins KWM-1, KWS-1/75A-4, and compatible with S-Line/KWM-2 equipment. Features hybrid transformer circuitry for clean audio balancing and isolation. Simple terminal connections – easy setup
  • Collins 189A-1 External Hybrid Phone Patch in excellent condition. Classic Collins accessory for phone patch operation, allowing telephone line connection to your transceiver for third-party or remote contacts. Designed for use with Collins KWM-1, KWS-1/75A-4, and compatible with S-Line/KWM-2 equipment. Features hybrid transformer circuitry for clean audio balancing and isolation. Simple terminal connections – easy setup
  • Collins 189A-1 External Hybrid Phone Patch in excellent condition. Classic Collins accessory for phone patch operation, allowing telephone line connection to your transceiver for third-party or remote contacts. Designed for use with Collins KWM-1, KWS-1/75A-4, and compatible with S-Line/KWM-2 equipment. Features hybrid transformer circuitry for clean audio balancing and isolation. Simple terminal connections – easy setup
$59.99
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Description

Collins 189A-2 external hybrid phone patch accessory for the KWM-1 / 75A-4 / KWS-1 / 312A-2 in Very Nice Condition #2

 This Phone Patch is in excellent cosmetic condition and has the Matching knobs for the S-Line stations but these units were also used in the KWM-1 / 75A-4 / KWS-1 / 312A-2 set.

I have not tested or used this phone patch but there is very few things to go wrong in this simple circuit.

 A copy of the manual is included.

 This one comes with feet on the bottom for stand alone operation (rather than mounting it in the matching speakers which you would remove and use mounting screws)

 It also comes with a wiring harness. 

Collins 189A Phone Patch (often referred to as 189-A or 189A).
 
 
This is a vintage external hybrid phone patch accessory from Collins Radio, designed for amateur radio use in the late 1950s/early 1960s era. It enables telephone line interfacing for "phone patching" — allowing a remote telephone user to transmit and receive over the air via the connected transceiver (with proper VOX or manual switching and legal compliance). It uses a hybrid transformer circuit for isolation and balancing between the radio audio and the phone line to minimize hum, sidetone, and feedback issues.
 
 
Key Specifications & Features
  • Type: Hybrid transformer phone patch (low-impedance design).
  • Output Impedance: Approximately 600 ohms (phone line side).
  • Connections: Simple terminal connections to the transceiver's phone patch points and to the telephone line.
  • Controls: Typically includes a balance/null adjustment for proper hybrid operation and transmit/receive switching provisions.
  • Compatibility: Designed for easy integration with Collins equipment via dedicated terminal strips or jacks.
     
    universal-radio.com
Compatible RadiosIt was primarily intended for use with Collins “Gold Dust Twins” (KWS-1 transmitter + 75A-4 receiver) and the KWM-1 transceiver. It also works with later S-Line and KWM-2 series (with possible minor wiring adaptations, as noted in some manuals). Some station consoles like the 312B series incorporated the 189A phone patch.
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