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The purpose of this page is to capture and document the Yaesu FT-101 series radios during the 1970's. It has taken me 12

years to collect a transceiver and every accessory to make a "complete station". I encourage your feed back, corrections,

and additions. I am not an Electrical Engineer, so I can not help with specific repair or substitution problems. I simply don't

have access to this type of material or equipment. My objective is to document the Yaesu FT-101 era and to provide a

detailed understanding so that the value of this equipment can be realized.

Thanks, Al-NW2M

FT-101 History FT-101 Model Numbers Physical Construction Advertised Features

General Specifications A "Complete" Station Station Accessories Tune-up Procedures

Known Modifications 6JS6C Tubes Basic Alignment Points QST / 73 / CQ

AM Operation Weights and Shipping Repair Facilities Original Prices

Mobile Operations Fox-Tango Newsletters Comments/Corrections Credits

About the author - Al Rabassa, NW2M

The FT-101 series of transceivers first appeared outside of the United States in 1970 and then inside the United States in late

1971. It gained overnight approval of amateur radio operators for its quality of signal, flexibility and for professional

attention to workmanship and design. The modular design of 10 solid state circuit boards on a common chassis with a tube

amplifier caught the eye of discriminating hams world wide.

It was a strong performer. Although far from perfect, the first FT-101's suffered from intermod when strong signals were

present during receive and generated spurs on transmit. Hams began to investigate these problems and offer improvements

to existing circuit design. The factory responded with a major modification which significantly improved the receiver of the

early FT-101's. The serial number revealed which transceiver was "early" and "late". So that the "early" FT-101 hams would

not feel obsolete, Yaesu offered the entire modification which made an "early" into a "late" and sold it as a kit along with a

25 page instruction guide. Problems began as many hams lacked the proper test equipment and the know-how needed to

make such an upgrade. After months of fighting with customers, Yaesu withdrew the kit (MIR-1 Modification Kit) and

would only install it at their factory. Adding to the confusion was the fact that there were five (5) different sub-models

within the "early" FT-101 series, the last being the FT-101 "late" model. The situation arose where identical FT-101 radios

sat side by side with the only indication of the internal layout was by the serial number.

Additional improvements were made and with the addition of the 160 meter band, the FT-101B was released. Yet more

Yaesu FT-101 HF Transceiver Home Page, NW2M http://www.qsl.net/nw2m/

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Summary of content (14 pages)

PAGE 1
Yaesu FT-101 HF Transceiver Home Page, NW2M 1 di 14 http://www.qsl.net/nw2m/ The purpose of this page is to capture and document the Yaesu FT-101 series radios during the 1970's. It has taken me 12 years to collect a transceiver and every accessory to make a "complete station". I encourage your feed back, corrections, and additions. I am not an Electrical Engineer, so I can not help with specific repair or substitution problems. I simply don't have access to this type of material or equipment.
PAGE 2
Yaesu FT-101 HF Transceiver Home Page, NW2M 2 di 14 http://www.qsl.net/nw2m/ improvements and the addition of a real "RF" speech processor led to the release of the FT-101E model. The "E" model was fully refined with all of the previous problems having been worked out. This was the most popular and the most produced model by Yaesu in the FT-101 series. Three models of the "E" were released.
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Yaesu FT-101 HF Transceiver Home Page, NW2M 3 di 14 http://www.qsl.net/nw2m/ FT-101E 160-10 meter transceiver. RF Speech Processor. Three sub-models: "Early" - S/N 15,000 and lower. (PB1494) Processor "Mid" - S/N 15,001-20,500. (PB1534) Processor "Late" - S/N 20,501 and up. (PB1534A) Processor, (PB1547A) Regulator, (PB1183C) IF, (PB1315B) Audio, (PB1582) Blanker. FT-101EE Economy FT-101E model. All FT-101E specifications except, No Speech processor (available as an option).
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Yaesu FT-101 HF Transceiver Home Page, NW2M 4 di 14 http://www.qsl.
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Yaesu FT-101 HF Transceiver Home Page, NW2M 5 di 14 http://www.qsl.net/nw2m/ Solid state VFO, 1kHz resolution. Modulation modes - USB, LSB, CW, AM. Built-in, adjustable, VOX. Adjustable CW Side tone. Selectable 25kHz and 100kHz calibrator/marker. RIT control +/- 5kHz range. WWV reception for time and fine frequency calibration. Built-in speaker. Eight pole SSB filter. CW filter optional. Complete line of station accessories providing 160M thru 2M coverage.
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Yaesu FT-101 HF Transceiver Home Page, NW2M 6 di 14 http://www.qsl.net/nw2m/ coverage from 160 meters on HF through 2 meters (USB, LSB,CW, AM). Here is a list of each accessory, description, and specifications. FL-2100B/F/Z Linear Amplifier | FL-2100 Hook-up diagram | FL-2100 Schematic A | FL-2100 Schematic B | FL-2100 Transformer Wiring | The FL-2100B/F/Z is a conservatively rated matching amplifier for the FT-101 series.
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Yaesu FT-101 HF Transceiver Home Page, NW2M 7 di 14 http://www.qsl.
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Yaesu FT-101 HF Transceiver Home Page, NW2M 8 di 14 http://www.qsl.net/nw2m/ (zero-beat) the FT-101 internal marker located on the Regulator Board (TC1). QTR-24 Specifications: Time Format: 12 and 24 hour formats Accuracy: Continuously adjustable, 60 sec/month, nominal Power: 1.
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Yaesu FT-101 HF Transceiver Home Page, NW2M 9 di 14 http://www.qsl.net/nw2m/ Speaker Size: 4" x 6" Audio Power: 3 Watts RMS Patch Input: 4 Ohms, 600 Ohms (RCA, Shielded) Patch Output: 600 Ohms, 50K Ohms (RCA, Shielded) Telephone Connection: Unshielded Twisted-Pair (UTP), Red-Green or Black-Yellow pairs Patch Performance: 300-4000Hz, 600 Ohms balanced, complies with FCC Part 68.
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Yaesu FT-101 HF Transceiver Home Page, NW2M 10 di 14 MMB-1 XF-30C XF-30B DC-1 Crystals DD-1 http://www.qsl.net/nw2m/ Mobile Mount for FT Series CW Filter 500 Hz AM Filter 6kHz DC Converter for EX Models Any FT-101 Crystal 160M-10M Digital Display (Spectronics Model) $19 $45 $19 $40 $5 $169 $45 $5 $169 $23 $40 $40 $50 $5 * - Indicates Advertisers offering "close-out" prices to reduce stock. The 6JS6C tube is a TV Deflection Tube, or "Sweep Tube".
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Yaesu FT-101 HF Transceiver Home Page, NW2M 11 di 14 http://www.qsl.net/nw2m/ Rig Review| Harm.
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Yaesu FT-101 HF Transceiver Home Page, NW2M 12 di 14 http://www.qsl.net/nw2m/ One of the most misunderstood and mistuned modes available on the FT-101 transceivers is the AM (Amplitude Modulation) transmitter. (Second only to the RF Speech Processor!) The FT-101 has one of the best on-air signals for AM that you may ever find in a stock radio. It is also one of the easiest to make a mistake. The most common mistake is measuring AM power the same way that you measure SSB or CW signals using a watt meter.
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Yaesu FT-101 HF Transceiver Home Page, NW2M 13 di 14 http://www.qsl.net/nw2m/ Since FT-101 parts are sometimes very hard to find, please ask ANY repair facility how they obtain parts. If the simply call the Yaesu factory, you may be sending your FT-101 to the wrong place or waiting a very long tome. I prefer to deal with repair facilities that specializes in FT-101 parts, which means in some cases, they must use 'parts rigs' to find that hard to get part.
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Yaesu FT-101 HF Transceiver Home Page, NW2M 14 di 14 http://www.qsl.net/nw2m/ Or send email to: NW2M@QSL.NET Since 1/1/98 Last Update: 04/08/2000 AOR 20/07/2010 12.