BC-221-Q

HAS INTERNAL REGULATED POWER SUPPLY
125KHZ TO 20MHZ
SELF CONTAINED DESKTOP UNIT

FREQUENCY STANDARD
USED HERE AS AN EXTREMELY STABLE VFO
CONTROLS A HOMEBREW RECEIVER AND TRANSMITTER

BUILT IN 1942
RESTORED IN 2002
A LATER MODEL IN AN ALUMINUM CASE

  1. INTRODUCTION



INTRODUCTION

Acquired in September 2002. Front panel, calibration book, battery compartment, and main electronics were in very good condition. The paint on the case was in bad condition and the entire unit needed a thorough cleaning.

The case was sanded, primed and repainted with Krylon semi flat, spray paint. A line operated power supply was built and installed in the battery compartment with angle brackets.

Prior to painting, all hardware was removed and cleaned with copper cream, a copper polish.

The reference crystal was broken. The octal crystal holder was disassembled and a new 1.00000 mHz crystal was soldered in place.

The tuning mechanism was smooth but dry of lubrication causing an annoying sound when the spinner was quickly cranked. A few drops of 3-in-1 oil solved that problem.

Toothpaste was used on the window over the calibration book compartment to remove some light scratches in the plastic.

It is missing page 19 and 20 in the calibration book but that does not effect its use a very stable VFO. Well worth the restoration, it is an exceptionally stable VFO and standard.






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 Last updated Sep-2006

All pages © 1996-2006, by Frank Kamp, all rights reserved.