Heathkit HRA 10 Manual

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SPECIFICATIONS
Frequency Coverage.. ....... ..... 1001mm atieast 30 mc.mharmon1cso£100 Inc.
Crystal-
Type.............. ........ ....... Wafundnmentalfrequency.
Frequency....... ....... ............... ..... 100kc*.005%.
Pia-189mm... ...... ....... ....... .486".
Pinsite........................... ........ .050".
Tubenmmm. ....... H. ...... U. ....... ,. 68.66.
Power Requirements -
BrVOltage... ...... ........................ 150v01t3,1.1m1mamparaa,
Fuamentantage..... ..... ................... 8.Svous,.3ampere.
Dimensions. ..... . ...... 2-1/3"22-1/8"xa-IJB'Trom chassis.
NetWeight........ ..... ....................... 502.

Shippingweighl......................... ..... .. 11b.

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INTRODUCTION

Your HEATHKIT Model HRA- 10-1 Crystal Calibrator is an accu-
rate signal source which provides only]! murals 31,100 kc 1mg!-
vals up to 30 mn.

The HRA-lO-l can be used for many purposes such as checking

receiver ma! calibratim, checking band limits, and receiver,

RF augment.

The Calibrator was designed primarily to be used with the
HEATHKIT [Hi-10 Amateur-Band Receiver, however, it can be
used with most any other amateur receiver that provides the
necesaary operating voltages as listed in the Specificauons.

CIRCUIT DESCRIPTION

The Crystal Calibrator uses a GBAS tube in a crystal-commuted
oscillator circuit. A 100 k1) crystal is used to provide a stable
100 kc signal. Harmonic frequencies appear at each 100 kc up
to 80 me.

Ceramic trimmer capacitor CZ is usedinserteswith the crystal
to adjust the hmdamelfialcrymalfrequencyloemuV 100 kc. The
output signal of the Calibrator is coupled through capacitor C3
to the antenna circuit of the receiver.