18S-4, 18S-4A, 18S-4C, RT-380/AR HF transceiver

Description:

Receiver-transmitter, 2-18MHz, AM/CW, similar to Collins 18S4, 100W, 10 chan, 16 tubes, 600 ohm audio, requires 400, 750 and 28VDC, Collins

My son Max (3) enjoys the glowing tubes....

Collins advertisement collins 18S-4

 Collins 18S-4

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Following photo's show fabrication of Matthieu's, ON8PO, testcables and complete test setup for his Collins 18S-4A and 180K-3 (or Collins 180M-1) in his shack

Designing and fabrication of testcables

Matthieu is looking for the original manual of the Collins RT-380/AR (ON8PO)

Fabrication of testcable from controlbox to transceiver. (controlbox is not original for this setup. 

Mathieu is still looking for the Collins 314S-4 to complete his setup (ON8PO)

Fabrication of transceiver cables (1) (ON8PO)

Fabrication of transceiver cables (2) (ON8PO)

Finalising operational setup. Bracket is mounted on wood to save weight

The whole setup is transportable (ON8PO)

Final result after working several days (Christmas 2007) (ON8PO)

First test (ON8PO)

Operational test (see 2ea 811 and 813 glowing!). Current draw about 40 amp. (ON8PO)

Frequency test (ON8PO)

Test with Collins 180M-1. Power output shows about 110 Watts. Adjustable capacitor was needed to obtain

proper power output. This will be replaced with a fixed value capacitor (ON8PO)

Final result (ON8PO)

Next project: repair of Collins RT-380AR (ON8PO)

Collins RT-380AR is militrary version of the Collins 18S-4 (ON8PO)

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The predecessor of the Collins 18S-4, the 18S-1

(Advertisement)

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Help!

I am still looking for following items to complete my setup: 

-mounting bracket for the 18S-4A/C

-180M1 Antenna Matching Test Set

If you can help us please send an email

Thank you!

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