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Reviews For: Ray Jefferson model 6140, late 1960\'s Portable DF Unit.

Category: Receivers: non-amateur adaptable for ham use

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Review Summary For : Ray Jefferson model 6140, late 1960\'s Portable DF Unit.
Reviews: 1MSRP: Unknown
Description:
Portable Direction Finding unit meant for the commercial marine market. 12VDC either external, or 8 "D" size batteries, Covers LF, MW, lower SW from 1.62 - 5MHz, and VHF High Band FM. Includes BFO for SSB / CW, RF Gain, 8" rotatable bar antenna, signal strength meter, ANT sense button, Meter / Dial light button, and a left side 4" speaker.
Product is in production
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# last 180 days Avg. Rating last 180 days Total reviews Avg. overall rating
0013
N2MDV Rating: 2017-11-12
Great for AM broadcast DX'ing! Time Owned: more than 12 months.
About 1992, my neighbors then gave me this unit in which the had absolutely no clue as to what it was, or really what it was for, so the price was right. From what I've been told about this unit, and others like it, it was used by the commercial marine industry as a back-up for direction finding LORAN Beacons to help identify a port's location and direction from a ship. Has useful features like tuning from 150kHz - 5MHz. Nice rotatable bar antenna to help pull in DX, or null out an adjacent station, or QRM. RF Gain works in DF mode, but defeats the AGC, (So be aware of that with strong stations.). BFO useful for tuning SSB and CW on 160M and 75 / 80M, but does drift with first 30min of ON time. AM Broadcasting pretty selective and sensitive, but subject to image FREQ's and overload from very local stations, and this appears to be a single IF conversion design. (The RF Gain in DF mode helps here.) That 4" left side mounted speaker provides nice room filling pleasant audio from a station with decent fidelity. Sensitivity on VHF High Band FM very poor, but does receive NOAA Weather Radio Stations, albeit the very closest ones. Meter and lights are nice functions to have. Thus far, I find this unit most useful today DX MW broadcasts.