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- Q4643416 subject Q7134612.
- Q4643416 subject Q8237631.
- Q4643416 subject Q8237635.
- Q4643416 abstract "The 74A4 and KWS-1 are an amateur radio receiver and transmitter pair made by the Collins Radio Company of Cedar Rapids, Iowa that were introduced in 1955. They were designed to operate using the then new single-sideband (SSB) voice modulation as well as CW and AM modes. They were influential in popularizing SSB. The KWS-1 transmitter along with the 75A-4 receiver, together, cost over $2500 when new (equivalent to over $20,000 in 2012 dollars). Collins products at the time were considered 'top of the line'. Ham radio enthusiasts nicknamed the pair "The Gold Dust Twins," as they were unaffordable to most amateur radio enthusiasts when first introduced.Both radios used vacuum tubes and employed Collins innovations including mechanical filters and permeability tuned oscillators. The latter alters the resonant frequency of a circuit by moving a sintered powder core in and out of the tuning coil using a lead screw. The KWS-1 final amplifier use a pair of 4X150 power tubes and operated at a power input of one kilowatt, the maximum allowed under Federal Communications Commission (FCC) regulations at the time. The transmitter appearance matched the receiver, but its high voltage power supply was packaged in a separate pedestal.In a 2006 review of the half-century-old 75A-4 Stu Cohen wrote "Performance under all but extremely crowded band conditions is still excellent, and a 75A-4 will hold its own against almost any receiver. Under less crowded band conditions, the performance is superb."".
- Q4643416 thumbnail Collins_75A-4_Peoria.jpg?width=300.
- Q4643416 wikiPageExternalLink kws1.html.
- Q4643416 wikiPageWikiLink Q128831.
- Q4643416 wikiPageWikiLink Q1353748.
- Q4643416 wikiPageWikiLink Q183755.
- Q4643416 wikiPageWikiLink Q185727.
- Q4643416 wikiPageWikiLink Q1915551.
- Q4643416 wikiPageWikiLink Q3574371.
- Q4643416 wikiPageWikiLink Q461210.
- Q4643416 wikiPageWikiLink Q486439.
- Q4643416 wikiPageWikiLink Q5578722.
- Q4643416 wikiPageWikiLink Q560348.
- Q4643416 wikiPageWikiLink Q7134612.
- Q4643416 wikiPageWikiLink Q79897.
- Q4643416 wikiPageWikiLink Q8237631.
- Q4643416 wikiPageWikiLink Q8237635.
- Q4643416 comment "The 74A4 and KWS-1 are an amateur radio receiver and transmitter pair made by the Collins Radio Company of Cedar Rapids, Iowa that were introduced in 1955. They were designed to operate using the then new single-sideband (SSB) voice modulation as well as CW and AM modes. They were influential in popularizing SSB. The KWS-1 transmitter along with the 75A-4 receiver, together, cost over $2500 when new (equivalent to over $20,000 in 2012 dollars).".
- Q4643416 label "75A-4 and KWS-1".
- Q4643416 depiction Collins_75A-4_Peoria.jpg.