RAN Technology
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Godzilla 2019 Trailer

Battle of the Boatanchor Radios?
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Crystals Go To War

A documentary about the technology that won WWII
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WWII Command Set radio checkout in a P-47 Thunderbolt

Radio Mechanic Jones...bring your screwdriver, you have a lot of Dzus fasteners in your future!
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Ham Radio and Disaster Preparedness

A California ham's vintage radios featured in EMCOMM video
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Controlling external devices using VERSA-TR

VERSA-TR can be used as an RF-actuated switch to control external devices such as a linear amplifier.

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RAN Technology Gallery Images

Gallery: The Yaesu Chrome Coffin Twins - FLDX-400 and FRDX-400

 

This week...

The Yaesu FRDX-400 is an amateur band receiver covering 1.7-2.3, 3.5-4.1, 6.9-7.5, 13.9-14.5, 20.9-21.5, 27.9-28.5, 28.5-29.1 MHz in AM, SSB and CW modes (FM mode is optional). This double conversion, tube receiver features mechanical filters, crystal controlled oscillators and crystal calibrator (25/100 kHz). It is designed to match the FLdx400 (FL-DX-SSB) transmitter.  Mine is "loaded" with the FM detector and 6 and 2 meter converters and both wide AM and narrow CW filters.   Features include a 1 kHz accurate analog dial, attenuator, crystal calibrator, noise blanker, AGC OFF/SLOW/FAST, RF gain and squelch. 14.5 x 6.5 x 11.5 inches 25 Lbs.

The Yaesu Musen FLDX-400 transmitter is capable of operating on all standard amateur frequencies between 3.5 and 30 mHz. It can generate CW, AM or SSB signals, with a peak power of 180 watts, and an average power of 120 watts using a pair of 6JS6 sweep tubes in the PA.   Transceives with the FRDX400 or separate frequency control and provides dual receive, semi-break-in CW and VOX on transmit, and a frequency check spot switch.  

Both units have built-in power supplies and were sold from about 1971 through 1974.

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The Chrome Coffin Twins

FRDX-400 and FLDX-400

Posted: 03/23/2019 (ranickels)
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FLDX-400 transmitter

with desk mic

Posted: 03/23/2019 (ranickels)
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FRDX-400 panel

Dial and meter

Posted: 03/23/2019 (ranickels)
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FLDX-400 panel

Dial and meter

Posted: 03/23/2019 (ranickels)
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Inside the FRDX-400

loaded with all options

Posted: 03/23/2019 (ranickels)
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FRDX-400 receiver

mechanical filters

Posted: 03/23/2019 (ranickels)
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FRDX-400 receiver

Six and Two Meter converters

Posted: 03/23/2019 (ranickels)
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FLDX-400 transmitter

Interior view

Posted: 03/23/2019 (ranickels)
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FLDX-400 transmitter

Mechanical filter

Posted: 03/23/2019 (ranickels)
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Microphone

Made in Japan, branded "RCA"

Posted: 03/23/2019 (ranickels)
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Microphone detail

Who made it?

Posted: 03/23/2019 (ranickels)